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Journal of Advanced Dielectrics 2015年第4期5卷 1-9页

作者： radheshyam rai Poonam Kumari M.A.Valente School of Physics Shoolini UniversitySolan173212HPIndia Departamento de Fisica i3nUniversidade de AveiroCampus Universitario de Santiago3810-193 AveiroPortugal

In this paper,we investigated the influence of rare earth(RE=La and Gd)doped Ba_(0.9575)RE_(0.04)Ca_(0.0025)Ti_(0.80685)Mn_(0.002475)Nb_(0.002475)Zr_(0.1782)O_(3)(BCTMNZ)ceramics were fabricated by using a conventional solid state reaction *** doping effects of La and Gd on the structural and magnetic properties were *** structural pattern of the ceramic samples were investigated by X-ray diffraction and the results indicated that both samples shows an orthorhombic structure with pure *** and crystalline size values for Gd and La doped were 0.31-0.33%and 0.154-0.181μm,*** room temperature hysteresis loops were obtained by using a vibrating sample *** doped ceramic showed the higher value of mag-netization i.e.,0.369μB/*** compared to Gd doped BLTMNZ ceramics.

关键词： Ceramics X-ray diffraction lttice strain magnetic properties

Dielectric,electrical conduction and magnetic properties of multiferroic Bi_(0.8)Tb_(0.1)Ba_(0.1)Fe_(0.9)Ti_(0.1)O_(3)perovskite compound

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Journal of Advanced Dielectrics 2017年第5期7卷 47-56页

作者： Poonam Kumari radheshyam rai Seema Sharma M.A.Valente School of Physics and Materials Science Shoolini University 173212 Solan H.P.India Ferroelectric Research Laboratory Department of Physics A N CollegePatna 800013India Departamento de Fisica I3NUniversidade de Aveiro Campus Universitario de Santiago 3810193 AveiroPortugal Department of Physics ACBSEternal University Baru Sahib 173101H.P.India

This work focuses on the structural,electrical and magnetic properties of Bi_(0.8)Tb_(0.1)Ba_(0.1)Fe_(0.9)Ti_(0.1)O_(3)ceramics,fabricated by solid state reaction *** forms of the samples at RT exhibited perovskite phase through the hexagonal structure at room *** studies of the materials with frequency at different temperatures(25-400℃)exhibit two dielectric anomalies,first at 175℃(ferroelectric-ferroelectric transition)and second at around 320℃(ferroelectric-paraelectric transition).The Curie temperature moved towards the low side temperature with the increase in *** less value of activation energy got for these samples could be attributed to the influence of electronic contribution to the conductivity.A significant change in the magnetic studies was observed for Bi_(0.8)Tb_(0.1)Ba_(0.1)Fe_(0.9)Ti_(0.1)O_(3) *** impedance analysis confirms the non-Debye type nature of the ceramic and relaxation frequency moved to a higher *** Nyquist plot and conductivity studies showed the NTCR behavior of *** highest magnetization field was found at temperature-268.15℃.

关键词： Lead-free ceramics X-ray difraction(XRD) phase transitions electrical conduction magnetic properties multiferroics

Study of the structural and electrical behavior of Bi(Mg,Ti)O_(3)modified(Ba,Ca)TiO_(3)ceramics

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Journal of Advanced Dielectrics 2016年第4期6卷 72-80页

作者： Md.Kashif Shamim Seema Sharma Arpana Singh radheshyam rai Rashmi Rani Ferroelectric Research Laboratory Department of Physics A.N.CollegePatna 800013India School of Physics and Materials Science Shoolini University SolanHimachal PradeshIndia

The ability of BaTiO_(3)to form solid solutions with different dopants(both iso-and aliovalent)makes it versatile for various *** the present study,(Ba,Ca)TiO_(3)(BCT)is modified with Bi(MgTi)O_(3)(BMT)in search for new lead-free ferroelectric material and improve their *** this purpose,BCT acts as a main base material and BMT acts as a modifier to fabricate a multifunctional *** this study,we report the structural and electrical properties of lead free piezo-ceramics(1-x)(Ba_(0.8)Ca_(0.2))TiO_(3–x)Bi(Mg_(0.5)Ti_(0.5))O_(3)with x=0.2,0.4,0.5 prepared by solid-state sintering *** perovskite phase with tetragonal structure is obtained for all the compositions,which is reconfirmed by the Raman Spectroscopic *** study confirm the temperature stable behavior of the dielectric permittivity values above 300℃.The dielectric constant value decreases with increase in BMT doping *** Spectroscopic study confirms non-Debye type dielectric relaxation in the *** Nyquist plot and conductivity studies show the negative temperature coefficient of resistance behavior(NTCR)of the samples.

关键词： Perovskite Raman analysis non-Debye type XRD ferroelectrics.

Comprehensive investigation of structural,dielectric and local piezoelectric properties of KNN ceramics

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Journal of Advanced Dielectrics 2019年第2期9卷 33-44页

作者： Poonam Kumari Madan Lal Sunil Kumar radheshyam rai Anupinder Singh D.V.Karpinsky Igor Bdikin Department of Physics ACBS Eternal UniversityBaru Sahib 173101 Himachal PradeshIndia Department of Physics Guru Nanak Dev University Amritsar 143005India Scientific-Practical Materials Research Centre of NAS of Belarus Minsk 220072 BelarusIndia National Research University of Electronic Technology“MIET”Zelenograd 124498 MoscowRussia TEMA-NRD Mechanical Engineering Department and Aveiro Institute of Nanotechnology(AIN)University of AveiroAveiro 3810-193Portugal

In this research paper,we utilized the traditional high-temperature solid-state reaction method to fabricate the K_(0.495)Na_(0.520)NbO_(3),K_(0.480)Na_(0.535)NbO_(3)and K_(0.475)Na_(0.540)NbO_(3)(abbreviated as KNN-1,KNN-2,and KNN-3,respectively)lead-free ion deficient ceramics for understanding the influence of ionic deficiency on the crystalline structure and dielectric/piezoelectric properties of the samples.X-ray diffraction patterns of these samples exhibited a perovskite tetragonal *** anomalies around 287℃and 471℃were identified as ferroelectric to ferroelectric and ferroelectric to paraelectric-transition temperatures for KNN-2 at 1 *** was found that the composition KNN-2 exhibit relatively high Curie temperature i.e.,471℃.The conductivity plots confirm that the activation energies are *** impedance behavior in our ceramic samples can be analyzed with the bulk/grain *** slope of Z′with temperature shows negative temperature coefficient of resistance(NTCR)type behavior in proposed KNN ceramics material.

关键词： KNN dielectric properties X-ray diffraction(XRD) NTCR PFM

Structural,dielectric and magnetic properties of Pr-,Tb-and Dy-doped(Bi_(0.95)RE_(0.05))(Fe_(0.95)Mn_(0.05))O_(3) ceramics synthesized by solid-state reaction method

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Journal of Advanced Dielectrics 2013年第4期3卷 55-61页

作者： radheshyam rai Shweta Thakur M.A.Valente Andrei L.Kholkin School of Physics Shoolini University SolanHP 173229India Departamento de Fisica I3NUniversidade de Aveiro Campus Universitario de Santiago 3810-193 AveiroPortugal Department of Ceramics and Glass Engineering and CICECO University of Aveiro 3810-193 AveiroPortugal

The multiferroic(Bi_(0.95)RE_(0.05))(Fe_(0.95)Mn_(0.05))O_(3)(where RE=Pr,Tb and Dy)has been synthesized using solid-state reaction *** of Pr,Tb and Dy substitution on the structure,electrical and ferroelectric properties of(Bi_(0.95)RE_(0.05))(Fe_(0.95)Mn_(0.05))O_(3) samples have been studied by performing X-ray diffraction,dielectric measurements and magnetic *** crystal structure of the ceramic samples have a monoclinic *** vibrating sample magnetometer(VSM)measurement shows a significant change in the magnetic properties of Pr-,Tb-and Dy-doped(Bi_(0.9)RE_(0.05))(Fe_(0.95)Mn_(0.05))O_(3).It is seen that coercive field(Hc)and remanent magnetization(Mr)increases for Pr but decreases for Dy and Tb.

关键词： Ferrites X-ray diffraction dielectric properties electrical properties magnetic properties

FERROELECTRIC AND MAGNETIC PROPERTIES OF PEROVSKITE STRUCTURED Bi_(1-x-y)Gd_(x)Ba_(y)Fe_(1-y)Ti_(y)O_(3)MAGNETOELECTRIC CERAMICS

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Journal of Advanced Dielectrics 2011年第2期1卷 257-267页

作者： radheshyam rai IGOR BDIKIN M.A.VALENTE ANDREI L.KHOLKIN Department of Ceramics and Glass Engineering and CICECO University of Aveiro 3810-193 AveiroPortugal Centre for Mechanical Technology and Automation University of Aveiro 3810-193AveiroPortugal Department of Physics University of Aveiro 3810-193 AveiroPortugal

Ternary solid solutions of BiFeO_(3),GdFeO_(3)and BaTiO_(3)have been prepared by solid-state reaction *** properties of these ceramics have been characterized in the tem-perature range between room temperature and 673 K and magnetic properties between 5 K and *** the understanding of the multiferroic property,the relation between the crystal structures,magnetic transition and ferroelectric transitions with increasing temperature have been *** ceramic samples show single perovskite *** Ba content exceeds 0.2 wt%,the sintering ability is weakened and the phase structure of Bi_(1-x-y)Gd_(x)Ba_(y)Fe_(1-y)Ti_(y)O_(3)(with x=0.2 and y=0.1,0.2,0.3,0.4,0.5)solid solution changes from rhombohedral to tetragonal *** maximum ferroelectric transition temperature(T_(c))of this system was in the range 154-165℃with the dielectric constant peak of 6000 for y=0.5 at 100 ***-saturated piezoresponse hysteresis loops were observed for all compositions indicating room temperature *** increasing Ba content(up to 0.3 wt%)the remanent magnetization M,increased and the coercive magnetic field decreased.

关键词： Ceramics X-ray difraction dielectric properties electrical properties magnetic properties

Dielectric and magnetic properties of Ba-,La-and Pb-doped Bi_(0.8)Gd_(0.1)M_(0.1)Fe_(0.9)Ti_(0.1)O_(3) perovskite ceramics

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Journal of Advanced Dielectrics 2014年第2期4卷 26-34页

作者： radheshyam rai M.A.Valente Anoop Kumar Shukla Seema Sharma Andrei L.Kholkin School of Physics Shoolini UniversitySolanHP 173229India Departamento de Fisica I3NUniversidade de Aveiro Campus Universitario de Santiago3810-193 AveiroPortugal Department of Physics Amity Institute of Applied Sciences Amity University Uttar PradeshG.B.NagarUP 201301India Ferroelectric Research Laboratory Department of Physics A N CollegePatna 800013India Department of Ceramics and Glass Engineering and CICECO University of Aveiro 3810-193 AveiroPortugal

The multiferroic Bi_(0.8)Gd_(0.1)M_(0.1)Fe_(0.9)Ti_(0.1)O_(3),(where M=Ba(DB),La(DL)and Pb(DP))has been synthesized by using solid-state reaction *** of Ba,La and Pb substitution on the structure,electrical and ferroelectric properties of Bi_(0.8)Gd_(0.1)M_(0.1)Fe_(0.9)Ti_(0.1)O_(3) samples have been studied by performing X-ray diffraction,dielectric and magnetic *** crystal structures of the ceramic samples have a tetragonal *** vibrating sample magnetometer(VSM)measurement shows a significant change in the magnetic properties of Ba-doped Bi_(0.8)Gd_(0.1)M_(0.1)Fe_(0.9)Ti_(0.1)O_(3) as compared to La-and Pb-doped *** is seen that coercive field(HC)and remanent magnetization(MR)increases with Ba-doped ceramics but decreases for La-and Pbdoped ceramics.

关键词： Multiferroic X-ray diffraction dielectric properties electrical properties magnetic properties

A Novel Low Temperature Synthesis of KNN Nanoparticles by Facile Wet Chemical Method

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Materials Sciences and Applications 2017年第3期8卷 247-257页

作者： Rashmi Rani Seema Sharma Marzia Quaglio radheshyam rai Stefano Bianco Diego Pugliese Candido Fabrizio Pirri Ferroelectric Research Laboratory Department of Physics A. N. College Patna India Center for Space Human Robotics (CSHR) Instituto Italiano di Tecnologia (IIT) Torino Italy Department of Applied Science and Technology (DISAT) Politecnico di Torino Torino Italy School of Physics and Materials Science Shoolini University Solan India

Sodium potassium niobate (KNN) (K0.5Na0.5NbO3) nanopowder with a mean particle size of about 20 - 30 nm was synthesized by wet chemical route using Nb2O5 as Nb source. A solution of K, Na and Nb cations was prepared, which resulted in a clear gel after the thermal treatment. Phase analysis, microstructure and morphology of the powder were determined by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Field Emission Scanning Electron Microscopy (FESEM). The obtained gel was first analyzed by Thermo Gravimetric Analyzer (TGA) and Differential Scanning Calorimetry (DSC), and then calcined at different temperatures of 400℃, 500℃, 600℃ and 700℃. The X-Ray Diffraction (XRD) patterns of the synthesized samples confirmed the formation of the orthorhombic crystal phase of K0.5Na0.5NbO3 at 500?C, a temperature significantly lower than that typically used in the conventional mixed oxide route. The process developed in this work is convenient to realize the mass production of KNN nanopowders at low cost and suitable for various industrial applications.

关键词： KNN Nano-Powder Sol-Gel Method Perovskite Phase Low Temperature Sintering Ceramic Processing

IMPEDANCE AND MODULUS SPECTROSCOPY CHARACTERIZATION OF SODIUM-BISMUTH TITANATE-BASED LEAD-FREE FERROELECTRIC MATERIALS

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Journal of Advanced Dielectrics 2012年第1期2卷 48-58页

作者： DHANANJAY K.SHARMA RAJU KUMAR radheshyam rai SEEMA SHARMA ANDREI L.KHOLKIN Ferroelectric Research Laboratory Department of Physics A N CollegePatna 800013India Department of Ceramics and Glass Engineering and CICECO University of Aveiro 3810-193AveiroPortugal

In this paper,we present impedance spectroscopy of Sodium Bismuth Titanate-based materials belonging to(1-x)TNa_(1/2)Bi_(1/2)TiO_(3)-xBaTiO_(3)(x=0.04)(NBT-BT)***-BT ceramics are prepared by high temperature solid-state reaction method.X-ray diffraction technique showed single-phase polycrystalline sample with an ABO3 perovskite *** behavior and the impedance relaxation were investigated in a wide range of temperature(room temperature(RT)-500℃)and frequency(1 kHz-1 MHz).A broad dielectric constant peak was observed over a wide temperature range around the phase transition *** complex impedance plot exhibited one impedance semicircle identified over the frequency range of 1 kHz-1MHz,which is explained by the grain effect of the *** centers of the impedance semicircles lie below the real axis,which indicates that the impedance response is a Cole-Cole type relaxation.

关键词： Ceramics X-ray diffraction piezoelectricity perovskite dielectric properties

Current and Potential Roles of Ferroptosis in Bladder Cancer

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Current Medical Science 2024年第1期44卷 51-63页

作者： Wen-xin AN radheshyam Gupta Kun ZHAI Ya-ru WANG Wan-hai XU Yan CUI Department of Urology Harbin Medical University Cancer HospitalHarbin 150081China Department of Internal Medical Oncology Harbin Medical University Cancer HospitalHarbin 150081China

Ferroptosis,a type of regulated cell death driven by iron-dependent lipid peroxidation,is mainly initiated by extramitochondrial lipid peroxidation due to the accumulation of iron-dependent reactive oxygen *** is a prevalent and primitive form of cell *** cellular metabolic processes regulate ferroptosis,including redox homeostasis,iron regulation,mitochondrial activity,amino acid metabolism,lipid metabolism,and various disease-related signaling *** plays a pivotal role in cancer therapy,particularly in the eradication of aggressive malignancies resistant to conventional *** studies have explored the connection between ferroptosis and bladder cancer,focusing on its incidence and treatment *** biomolecules and tumor-associated signaling pathways,such as p53,heat shock protein 1,nuclear receptor coactivator 4,RAS-RAF-MEK,phosphatidylinositol 3-kinase-AKT-mammalian target of rapamycin,and the Hippo-tafazzin signaling system,exert a moderating influence on ferroptosis in bladder *** inducers,including erastin,artemisinin,conjugated polymer nanoparticles,and quinazolinyl-arylurea derivatives,hold promise for enhancing the effectiveness of conventional anticancer medications in bladder cancer *** conventional therapeutic drugs and treatment methods related to ferroptosis offers a promising approach for the treatment of bladder *** this review,we analyze the research on ferroptosis to augment the efficacy of bladder cancer treatment.

关键词： ferroptosis bladder cancer ferroptosis-associated tumor signaling pathway ferroptosis inducer