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measurement of away-side broadening with self-subtraction of flow in Au+Au collisions at √snn=200 GeV

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Chinese Physics C 2020年第10期44卷 59-67页

作者： L.Adamczyk J.R.Adams J.K.Adkins G.Agakishiev m.m.Aggarwal Z.Ahammed I.Alekseev D.m.Anderson A.Aparin E.C.Aschenauer m.U.Ashraf F.G.Atetalla A.Attri G.s.Averichev V.Bairathi K.Barish A.Behera R.Bellwied A.Bhasin J.Bielcik J.Bielcikova L.C.Bland I.G.Bordyuzhin J.D.Brandenburg A.V.Brandin J.Butterworth H.Caines m.calderón de la barca sánchez D.Cebra I.Chakaberia P.Chaloupka B.K.Chan F-H.Chang Z.Chang n.Chankova-Bunzarova A.Chatterjee D.Chen J.H.Chen X.Chen Z.Chen J.Cheng m.Cherney m.Chevalier s.Choudhury W.Christie X.Chu H.J.Crawford m.Csanád m.Daugherity T.G.dedovich I.m.deppner A.A.derevschikov L.Didenko X.Dong J.L.Drachenberg J.C.Dunlop T.Edmonds n.Elsey J.Engelage G.Eppley s.Esumi O.Evdokimov A.Ewigleben O.Eyser R.Fatemi s.Fazio P.Federic J.Fedorisin C.J.Feng Y.Feng P.Filip E.Finch Y.Fisyak A.Francisco L.Fulek C.A.Gagliardi T.Galatyuk F.Geurts A.Gibson K.Gopal D.Grosnick W.Guryn A.I.Hamad A.Hamed s.Harabasz J.W.Harris s.He W.He X.H.He s.Heppelmann s.Heppelmann n.Herrmann E.Hoffman L.Holub Y.Hong s.Horvat Y.Hu H.Z.Huang s.L.Huang T.Huang X.Huang T.J.Humanic P.Huo G.Igo D.Isenhower W.W.Jacobs C.Jena A.Jentsch Y.JI J.Jia K.Jiang s.Jowzaee X.Ju E.G.Judd s.Kabana m.L.Kabir s.Kagamaster D.Kalinkin K.Kang D.Kapukchyan K.Kauder H.W.Ke D.Keane A.Kechechyan m.Kelsey Y.V.Khyzhniak D.P.Kikoła C.Kim B.Kimelman D.Kincses T.A.Kinghorn I.Kisel A.Kiselev m.Kocan L.Kochenda L.K.Kosarzewski L.Kramarik P.Kravtsov K.Krueger n.Kulathunga mudiyanselage L.Kumar s.Kumar R.Kunnawalkam Elayavalli J.H.Kwasizur R.lacey s.lan J.m.landgraf J.lauret A.Lebedev R.Lednicky J.H.Lee Y.H.Leung C.Li W.Li W.Li X.Li Y.Li Y.Liang R.Licenik T.Lin Y.Lin m.A.Lisa F.Liu H.Liu P.Liu P.Liu T.Liu X.Liu Y.Liu Z.Liu T.Ljubicic W.J.Llope R.s.Longacre n.s.Lukow s.Luo X.Luo G.L.ma L.ma R.ma Y.G.ma n.magdy R.majka D.mallick s.margetis C.markert H.s.matis J.A.mazer n.G.minaev s.mioduszewski B.mohanty I.mooney Z.moravcova D.A.morozov m.nagy J.D.nam nasim md K.nayak D.neff J.m.nelson D.B.nemes m.nie G.nigmatkulov T.niida L.V.nogach T.nonaka A.s.nunes G.Odyniec A.Ogawa Abilene Christian University AbileneTexas 79699 AGH University of science and Technology FPACSCracow 30-059Poland Alikhanov Institute for Theoretical and Experimental Physics nRC"Kurchatov Institute" Moscow 117218Russia Argonne national laboratory ArgonneIllinois 60439 American University of Cairo New Cairo 11835New CairoEgypt Brookhaven national laboratory UptonNew York 11973 University of California BerkeleyCalifornia 94720 University of California DavisCalifornia 95616 University of California Los AngelesCalifornia 90095 University of California RiversideCalifornia 92521 Central China normal University WuhanHubei 430079 University of Illinois at Chicago ChicagoIllinois 60607 Creighton University OmahaNebraska 68178 Czech Technical University in Prague FNSPEPrague 11519Czech Republic Technische Universität Darmstadt Darmstadt 64289Germany ELTE Eötvös Loránd University BudapestHungary H-1117 Frankfurt Institute for Advanced studies FIAs Frankfurt 60438Germany Fudan University Shanghai 200433 University of Heidelberg Heidelberg 69120Germany University of Houston HoustonTexas 77204 Huzhou University HuzhouZhejiang 313000 Indian Institute of science Education and Research(IIsER) Berhampur 760010India Indian Institute of science Education and Research(IIsER)Tirupati Tirupati 517507India Indian Institute Technology PatnaBihar 801106India Indiana University BloomingtonIndiana 47408 Institute of modern Physics Chinese Academy of SciencesLanzhouGansu 730000 University of Jammu Jammu 180001India Joint Institute for nuclear Research Dubna 141980Russia Kent state University KentOhio 44242 University of Kentucky LexingtonKentucky 40506-0055 lawrence Berkeley national laboratory BerkeleyCalifornia 94720 Lehigh University BethlehemPennsylvania 18015 max-Planck-Institut für Physik Munich 80805Germany michigan state University East LansingMichigan 48824 national Research nuclear University mEPhI Moscow 115409Russia national Institute of science Education and Research HBNIJatni 752050Indi

High transverse momentum(pT)particle production is suppressed owing to the parton(jet)energy loss in the hot dense medium created in relativistic heavy-ion *** of energy at low-to-modest pT has been difficult to measure,owing to large anisotropic *** report a data-driven method for background evaluation and subtraction,exploiting the away-side pseudorapidity gaps,to measure the jetlike correlation shape in Au+Au collisions at √snn=200 GeV in the sTAR *** correlation shapes,for trigger particles pT>3GeV/c and various associated particle pT ranges within 0.5nsistent with Gaussians,and their widths increase with *** results indicate jet broadening in the medium created in central heavy-ion collisions.

关键词： di-hadron correlations jet heavy-ion

methods for a blind analysis of isobar data collected by the sTAR collaboration

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nuclear science and Techniques 2021年第5期32卷 43-50页

作者： J.Adam L.Adamczyk J.R.Adams J.K.Adkins G.Agakishiev m.m.Aggarwal Z.Ahammed I.Alekseev D.m.Anderson A.Aparin E.C.Aschenauer m.U.Ashraf F.G.Atetalla A.Attri G.s.Averichev V.Bairathi K.Barish A.Behera R.Bellwied A.Bhasin J.Bielcik J.Bielcikova L.C.Bland I.G.Bordyuzhin J.D.Brandenburg A.V.Brandin J.Butterworth H.Caines m.calderon de la barca sanchez D.Cebra I.Chakaberia P.Chaloupka B.K.Chan F-H.Chang Z.Chang n.Chankova-Bunzarova A.Chatterjee D.Chen J.Chen J.H.Chen X.Chen Z.Chen J.Cheng m.Cherney m.Chevalier s.Choudhury W.Christie X.Chu H.J.Crawford m.Csanad m.Daugherity T.G.dedovich I.m.deppner A.A.derevschikov L.Didenko X.Dong J.L.Drachenberg J.C.Dunlop T.Edmonds n.Elsey J.Engelage G.Eppley s.Esumi O.Evdokimov A.Ewigleben O.Eyser R.Fatemi s.Fazio P.Federic J.Fedorisin C.J.Feng Y.Feng P.Filip E.Finch Y.Fisyak A.Francisco L.Fulek C.A.Gagliardi T.Galatyuk F.Geurts A.Gibson K.Gopal X.Gou D.Grosnick W.Guryn A.I.Hamad A.Hamed s.Harabasz J.W.Harris s.He W.He X.H.He Y.He s.Heppelmann s.Heppelmann n.Herrmann E.Hoffman L.Holub Y.Hong s.Horvat Y.Hu H.Z.Huang s.L.Huang T.Huang X.Huang T.J.Humanic P.Huo G.Igo D.Isenhower W.W.Jacobs C.Jena A.Jentsch Y.Ji J.Jia K.Jiang s.Jowzaee X.Ju E.G.Judd s.Kabana m.L.Kabir s.Kagamaster D.Kalinkin K.Kang D.Kapukchyan K.Kauder H.W.Ke D.Keane A.Kechechyan m.Kelsey Y.V.Khyzhniak D.P.Kikoła C.Kim B.Kimelman D.Kincses T.A.Kinghorn I.Kisel A.Kiselev m.Kocan L.Kochenda L.K.Kosarzewski L.Kramarik P.Kravtsov K.Krueger n.Kulathunga mudiyanselage L.Kumar s.Kumar R.Kunnawalkam Elayavalli J.H.Kwasizur R.lacey s.lan J.m.landgraf J.lauret A.Lebedev R.Lednicky J.H.Lee Y.H.Leung C.Li C.Li W.Li W.Li X.Li Y.Li Y.Liang R.Licenik T.Lin Y.Lin m.A.Lisa F.Liu H.Liu P.Liu P.Liu T.Liu X.Liu Y.Liu Z.Liu T.Ljubicic W.J.Llope R.s.Longacre n.s.Lukow s.Luo X.Luo G.L.ma L.ma R.ma Y.G.ma n.magdy R.majka D.mallick s.margetis C.markert H.s.matis J.A.mazer n.G.minaev s.mioduszewski B.mohanty I.mooney Z.moravcova D.A.morozov m.nagy J.D.nam md.nasim K.nayak D.neff J.m.nelson D.B.nemes m.nie G.nigmatkulov T.niida L.V.nogach T.nonak Christian University AbileneTX 796992 AGH University of science and Technology FPACSCracow 30-059Poland Alikhanov Institute for Theoretical and Experimental Physics nRC"Kurchatov Institute" MoscowRussia 117218 Argonne national laboratory ArgonneIL 60439 American University of Cairo New CairoNew Cairo 11835Egypt Brookhaven national laboratory UptonNY 11973 University of California BerkeleyCA 94720 University of California DavisCA 95616 University of California Los AngelesCA 90095 University of California RiversideCA 92521 Central China normal University Wuhan 430079 University of Illinois at Chicago ChicagoIL 60607 Creighton University OmahaNE 68178 Czech Technical University in Prague FNSPEPrague 11519Czech Republic Technische Universitat Darmstadt Darmstadt 64289Germany ELTE Eotvos Lorand University Budapest 1117Hungary Frankfurt Institute for Advanced studies FIAs Frankfurt 60438Germany Fudan University Shanghai 200433 University of Heidelberg 69120 HeidelbergGermany University of Houston HoustonTX 77204 Huzhou University Huzhou 313000 Indian Institute of science Education and Research(IIsER) Berhampur 760010India Indian Institute of science Education and Research(IIsER)Tirupati Tirupati 517507India Indian Institute Technology PatnaBihar 801106India Indiana University BloomingtonIN 47408 Institute of modern Physics Chinese Academy of SciencesLanzhou 730000 University of Jammu Jammu 180001India Joint Institute for nuclear Research DubnaRussia 141980 Kent state University KentOH 44242 University of Kentucky LexingtonKY 40506-0055 lawrence Berkeley national laboratory BerkeleyCA 94720 Lehigh University BethlehemPA 18015 max-Planck-Institut fur Physik 80805 MunichGermany michigan state University East LansingMI 48824 national Research nuclear University mEPhI MoscowRussia 115409 national Institute of science Education and Research HBNIJatni 752050India national Cheng Kung University Tainan 70101 nuclear Physics Institute of the CAs Rez 25068Czech Republic Ohio state University

In 2018,the sTAR collaboration collected data from^(96)_(44)Ru+^(96)_(44)Ru and^(96)_(40)Zr+^(96)_(40)Zr at√^(s)nn=200 Ge V to search for the presence of the chiral magnetic effect in collisions of *** isobar collision species alternated frequently between 9644 Ru+^(96)_(44)Ru and^(96)_(40)Zr+^(96)_(40)*** order to conduct blind analyses of studies related to the chiral magnetic effect in these isobar data,sTAR developed a three-step blind analysis *** are initially provided a"reference sample"of data,comprised of a mix of events from the two species,the order of which respects time-dependent changes in run *** tuning analysis codes and performing time-dependent quality assurance on the reference sample,analysts are provided a species-blind sample suitable for calculating efficiencies and corrections for individual≈30-min data-taking *** this sample,species-specific information is disguised,but individual output files contain data from a single isobar *** run-by-run corrections and code alteration subsequent to these corrections are allowed at this *** these modifications,the"frozen"code is passed over the fully un-blind data,completing the blind *** a check of the feasibility of the blind analysis procedure,analysts completed a"mock data challenge,"analyzing data from Au+Au collisions at√^(s)nn=27 Ge V,collected in *** Au+Au data were prepared in the same manner intended for the isobar blind *** details of the blind analysis procedure and results from the mock data challenge are presented.

关键词： Blind analysis Chiral magnetic effect Heavy-ion collisions

Hydrological Processes in a small Research Watershed under Forest Coverage in the Coast of Chiapas, mexico

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Journal of Geoscience and Environment Protection 2023年第3期11卷 104-114页

作者： Juan Alberto Rodríguez-morales Romeo de Jesús Barrios-calderón Jorge Reyes-Reyes Dorian de Jesús Pimienta-de la Torre Autonomous University of Chiapas Faculty of Agricultural Sciences Cuerpo Académico Recursos Forestales Huehuetán Chiapas Mexico

In the hydrological watershed, some natural processes take place in which the interaction of water, soil, climate and vegetation favors the capture of water. The present study aimed to evaluate preliminary information regarding the hydrological response and the water balance in a small research watershed with tropical forest cover (15°01'44''n and 92°13'55''W, 471 m, 2.3 has). Events of precipitation, direct runoff, infiltration rate and baseflow were performed. The amount, duration and intensity of rainfall events were recorded with the use of a pluviograph. surface runoff was quantified with an established gauging station, an H-type gauging device and a horizontal mechanical gauging limnograph. Runoff base flow was measured at the gauging station using the volume-time method. Infiltration was measured using a triple ring infiltrometer, taking two measurements in the upper part and two in the lower part of the microbasin. Evapotranspiration was measured with the amount of rainfall entering and runoff leaving the watershed. In the study period, annual rainfall of 4417.6 mm distributed over 181 events were recorded;about 70% of the storms showed lower intensities at 20 mm·hsup>-1sup>. The total runoff was 345.8 mm caused by half of the rainfall events, which represents 7.8% of the total rain;77% of runoff events showed lower sheets of 5 mm and an average specific rate of 20.7 L·ssup>-1sup>·hasup>-1sup> with a maximum of 113.6 L·ssup>-1sup>·hasup>-1sup>. Three runoff events were greater than 20.1 mm and caused the 22.5% of the total runoff depth in the study period showing the equilibrium conditions in the hydrological response of the forest. Water outputs like baseflow was 669.5 mm. In this way, 90% of the rainfall is infiltrated every year in the micro-watershed, which shows the importance of the plant cover in the hydrological regulation and the groundwater recharge.

关键词： Hydrological Response Tropical Forest Runoff-Rain Ratio Water Balance Groundwater Recharge

A Crystallization study of nanocrystalline PZT 53/47 Granular Arrays Using a sol-Gel Based Precursor

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Journal of materials science & Technology 2011年第6期27卷 489-496页

作者： A.surez-Gómez J.m.saniger-Blesa F.calderón-Pinar CCAdeT-Universidad nacional Autónoma de méxico Cd.UniversitariaCirc.Exterior s/nA.P.70-186Coyoacn 04510México D.F.México laboratorio de Ingeniería Electroquímica Facultad de QuímicaUniversidad Nacional Autónoma de MéxicoCd.UniversitariaCoyoacn 04510México D.F.México Facultad de Física/ImRE San Lzaro y LUniversidad de la Habana

In this work,we intend to perform a detailed study on the crystallization process of PZT 53/47 nanostructured powders by starting out with an amorphous precursor synthesized by a sol-gel based *** interests also lie in the feasibility for controlling the average grain size of the final structure in the submicron range on an ab initio ***,Fourier transform infrared spectroscopy（FT-IR）,Raman（stokes and Anti-stokes）,X-ray diffraction（XRD） and scanning electron microscopy（sEm） are used to examine the microstructural characteristics based on previously reported differential thermal analysis/thermal gravimetric analysis（DTA/TGA） *** results show a crystallization temperature of 800℃ to attain pure perovskite phase with excellent morphological quality,average grain size 〈DG〉〈 300 nm and with average crystallite size 〈DC〉〈15 nm.

关键词： Powders-chemical preparation PZT synthesis sol-gel precursors microstructure- final Vibrational spectroscopies X-ray diffraction

Airborne bacteria associated with particulate matter from a highly urbanised metropolis:A potential risk to the population’s health

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Frontiers of Environmental science & Engineering 2022年第9期16卷 99-114页

作者： maría del Carmen calderón-Ezquerro Elizabeth selene Gómez-Acata Carolina Brunner-mendoza Instituto de Ciencias de la Atmósfera y Cambio Climático Universidad Nacional Autónoma de MéxicoCiudad de México 04510Mexico Facultad de medicina Universidad Nacional Autónoma de MéxicoCiudad de México 04510Mexico

Bacteria in the air present patterns in space and time produced by different sources and environmental *** studies have focused on the link between airborne pathogenic bacteria in densely populated cities,and the risk to the population’s *** associated with particulate matter(Pm)were monitored from the air of mexico City(mexico).We employed a metagenomic approach to characterise bacteria using the 16s rRnA *** bacteria sampling was carried out in the north,centre,and south of mexico City,with different urbanisation rates,during *** added to the particles were sampled using high-volume Pm_(10) *** ascertain significant differences in bacterial diversity between zones and seasons,the Kruskal-Wallis,Wilcoxon tests were done on alpha diversity ***-three air samples were collected,and DnA was sequenced using next-generation *** results indicated that the bacterial phyla in the north and south of the city were Firmicutes,Cyanobacteria,Proteobacteria,and Actinobacteria,while in the central zone there were more *** were no differences in the alpha diversity indices between the sampled *** to the OTUs,the richness of bacteria was higher in the central *** diversity was higher in the rainy season than in the dry season;the shannon index and the OTUs observed were higher in the central zone in the dry *** bacteria such as Kocuria,Paracoccus,and micrococcus predominated in both seasonal times,while staphylococcus,Corynebacterium,and nocardioides were found during the rainy season,with a presence in the central zone.

关键词： Airborne bacteria Urbanisation Pm10 mexico City microbiome

Anterior and Posterior Approach Results for Treatment of Cervical myelopathy in the Elderly: A 10-Year Experience in a mexican Institution

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Open Journal of Orthopedics 2021年第7期11卷 207-219页

作者： mauricio Daniel sánchez-calderón maría Elena Córdoba-mosqueda José Ramón Aguilar-calderón Carlos René Domínguez-Herz Diego Ochoa-Cacique Daniel Alejandro Vega-moreno Victor Andrés Reyes-Rodriguez Ulises García-González Abraham Ibarra-de la Torre Rodrigo Efraín Hernández-Reséndiz department of neurosurgery Hospital Central Sur de Alta Especialidad de Alta Especialidad de PEMEX Periferico sur 4091 Fuentes del Pedregal Tlalpan México City México department of neurosurgery Hospital Regional de Alta Especialidad “Centenario de la Revolución Mexicana” ISSSTE Cuernavaca Palo Escrito Emiliano Zapata department of neurosurgery Hospital Central Norte PEMEX Mexico City México department of neurosurgery Hospital &Aacute ngeles Clí nica Londres Mexico City Mexico

Introduction: degeneration of the cervical spine (CDsD) prevalence is nearly 90% by the 7th decade. This is the first research that compares the outcomes between the Anterior Approach (AA) and Posterior Approach (PA) ... 详细信息

Introduction: Degeneration of the cervical spine (CDSD) prevalence is nearly 90% by the 7th decade. This is the first research that compares the outcomes between the Anterior Approach (AA) and Posterior Approach (PA) to cervical myelopathy (CM) in the elderly. Materials and Methods: A retrospective observational study of electronic health records at the Hospital Central Sur de Alta Especialidad (HCSAE), PEMEX from January 2010 to May 2020 with patients older than 60 years submitted to cervical surgery. For the analysis we elaborated two groups according to the surgical approach: AA vs PA;we analyzed the trans-operative behavior, the immediate outcome, and after 3 months, 6 months, and 1 year. Results: span>As a total of 145 patients, the prevalence of CM in elderly was the 63.8% with a median age of 69 (64 - 75) years. We found statistical differences in strength outcome only in the P3m (p = 0.011), for sensitivity we found major prevalence of affection in the PA group. We didn’t report a significant difference in the Neck Disability Index (NDI) at all measures, but the PA presented a major incapacity. The Nurick scale results were significant in all stages (p . Discussionmily:Verdana;">: Patients show significant improvements in outcome measures with either anterior or posterior surgery. Both approaches are highly efficacious in preventing neurolo

关键词： Cervical spine surgical Approach Elderly Cervical myelopathy Cervical degenerative spine Disease

Productive Response of Pelibuey sheep to supplementation in the stretching season in the Dry Tropic

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American Journal of Plant sciences 2021年第9期12卷 1319-1327页

作者： Aguirre Herminio Aniano Gasga Pérez lauro Peláez Estrada Urfila Victoria Galindo Arturo de la Rosa Lozano Aguirre Eugenia mondragón calderón Uriel Tecnológico nacional de méxico Instituto Tecnológico de Pinotepa Oaxaca México

sheep meat production in the dry tropics of mexico is low in the dry season, due to lack of forage, therefore, strategic supplementation is important to avoid weight loss in animals;The research was carried out from August 15 to december 15, 2020 in order to evaluate the productive response of pelibuey sheep in confinement, fed with pangola grass hay (GH), plains grass silage (PGs) and supplemented with commercial feed (CF) in the dry season. 16 sheep of the same weight and age were used, four treatments were evaluated in them, in a completely random design;the treatments were four levels of supplement 0, 0.1, 0.2 and 0.3 kg of AC fed with HP and PGs. sheep were dewormed at the beginning of the experiment and housed in individual cages. The variables were: dry matter intake, daily weight gain (DWG) and Dm digestibility. Dm consumption was different (P -1 in T1 and a higher value of 0.112 kg in T4. The apparent digestibility of the dry matter showed a difference (P

关键词： Intake Weight Gain sheep Digestibility

The Acute and Chronic Effects of Co-Administration of Turmeric and Black Pepper Extracts in Genetic Hypertension

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Journal of Biosciences and medicines 2023年第8期11卷 114-128页

作者： ma. Guadalupe calderón-Gallardo Lilia Castillo-martínez samuel Estrada-soto Itzell A. Gallardo-Ortíz Rafael Villalobos-molina Unidad de Biomedicina Facultad de Estudios Superiores Iztacala Universidad Nacional Autónoma de México Tlalnepantla México Programa de maestría y Doctorado en Ciencias médicas Odontológicas y de la Salud Doctorado en Investigación Clínica Experimental en Salud Universidad Nacional Autónoma de México Ciudad de México México Instituto nacional de nutrición salvador Zubirán Ciudad de México México Facultad de Farmacia Universidad Autónoma del Estado de Morelos Cuernavaca México

High blood pressure is the main risk factor for cardiovascular diseases, it affects many people worldwide and is a public health problem. This study explored the acute and chronic actions of a mixture of turmeric (95% curcumin) plus black pepper (95% piperine) extracts, in the blood pressure pattern in spontaneously hypertensive rats (sHR) along they age. For the acute study male adult (4 - 7 months old) sHR and their control Wistar Kyoto rats (WKY) were used. A single oral dose of the mixture of turmeric/black pepper extracts (200 mg/2mg, respectively) suspension was administered. Tail-cuff was used to determine blood pressure during 180 min. For the chronic study, young (1-month-old) male sHR and their control WKY rats were fed with standard chow, or standard chow combined with cocoa, or combined with cocoa plus the mixture of turmeric/black pepper extracts;tail-cuff was used to determine blood pressure once a week, along 12 weeks. In a second chronic assay adult (5 months old) male sHR and their control WKY rats were fed with standard chow, or standard chow combined with cocoa, or combined with cocoa plus the mixture of turmeric/black pepper extracts;tail-cuff was used to determine blood pressure once a week, along 12 weeks. In all three studies, a decrease in systolic, diastolic and mean blood pressure was observed, being higher in sHR and negligible in WKY rats. The mixture of turmeric/black pepper extracts showed antihypertensive actions in sHR rats with no effect on WKY rats. The mixture delayed the onset of hypertension in young sHR rats.

关键词： Curcuma longa L. Peper nigrum L. Hypertension Polyphenol sHR

BiFeO_(3) codoping with Ba,la and Ti:magnetic and structural studies

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Journal of Advanced Dielectrics 2015年第4期5卷 53-60页

作者： O.García-Zaldívar s.Díaz-Castañón F.J.Espinoza-Beltran m.A.Hernández-landaverde G.López J.Faloh-Gandarilla F.calderón-Piñar Facultad de Física-Instituto de Ciencia y Tecnología de materiales Universidad de la Habana San Láazaro y L VedadoLa Habana 10400Cuba CInVEsTAV-Unidad Querétaro Libramiento Norponiente No.2000 Real de JuriquillaQuerétaroQro.76230México Instituto latino-Americanode Ciênciasda Vidaeda natureza Universidade Federalda Integração latino-Americana (ILCVN-UNILA)Avenida Tancredo NevesPTIBloco 6 CEP:85866-000-Foz do Iguaçu-ParanaBrazil División materiales Avanzados Instituto Potosinode Investigación Científica Tecnológica san Luis Potosí CP78216Méexico

Conventional solid state reaction method,from oxides and carbonates,was employed to prepare bismuth(Bi)-based multiferroic *** undoped BiFeO_(3)(BFO)and the codoped system with Ba,la and Ti(Bi_(1-x)Ba_(x)Fe_(1-y)Ti_(y)O_(3),Bi_(1-x-z)Ba_(x)lazFe_(1-y)TiyO_(3))with x,y,z=0.1 were prepared stoichiometrically and sintered at two different *** structural and magnetic properties were investigated at room *** measurements confirm the obtaining of the rhombohedral perovskite structure of the BFO family *** the undoped system,some reflections of undesired phases are present for two different sintering temperatures,while for the doped system only one phase is present for both *** magnetic characterization at room temperature revealed remarkable differences between the ceramic *** results show that for undoped BFO system,spontaneous magnetization is not observed at room ***,in doped one,a well-defined ferromagnetic behavior is observed at room temperature,possible,due to the suppression of the spatially modulated spin structure of BFO promoted by the reduction of the rhombohedral distortion and the weakening of the Bi-O *** XPs results confirm the presence of oxygen vacancies and the coexistence of Fe^(3+)and Fe^(2+) in all the studied *** measurements reveal that the dopant incorporation has not a direct effect in neel temperature but possibly yes in ferroelectric-paraelectric transition.

关键词： multiferroics XPs magnetic bismuth ferrite BiFeO_(3)