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solid solution strategy modulated defects engineering of(Cr_(1-x)V_(x))_(2)AlC MAX phase toward superior electromagnetic wave absorption

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Rare Metals 2024年第7期43卷 3205-3219页

作者： Ji-Lin Gou Yu-Kai Chang Shu Liu Peng-Hui Li Ping-Hao Cui Qian-Ku Hu Li-Bo Wang Xin Zhang Jun-Kai Wang Qi-Xun Xia Ai-Guo Zhou School of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo 454003China Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

Defects engineering is an effective strategy for manipulating electromagnetic parameters and enhancing electromagnetic wave(EMW)absorption ***,the relationship between them is not clear,especially in solid solution *** this work,a series of(Cr_(1-x)V_(x))_(2)AlC MAX phase solid solutions with layered structure were prepared via tuning the ratio of Cr and V to explore their EMW absorption *** experimental results indicated that the doping of V atoms at the M-site could effectively regulate its impedance matching and EMW absorption properties by introducing appropriate numbers of defects in the crystal,such as twin boundaries,dislocations and lattice *** them,if Cr:V=3:1,Cr_(1.5)V_(0.5)AlC,as radar absorption materials,could reach a strong reflection loss of-51.8 dB at the frequency of 12.8 GHz under an ultra-thin thickness of 1.3 *** reflection loss value could attain-10 dB in a wide frequency range of 2.7-18 GHz and thickness range of 1-5 *** addition,after high temperature and acid-alkali immersion treatment,this sample still had good EMW absorption capability,and the effective absorption bandwidth was enhanced from 2.3 to 2.6 GHz after concentrated acid immersion or 3.1 GHz after concentrated alkali *** work has great reference significance for the research and development of high-performance MAX-based EMW absorption materials in harsh environments.

关键词： MAX phases solid solution Defects engineering Electromagnetic wave absorption Harsh environments

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Creation of Sn_(x)Nb_(1−x)O_(2) solid solution through heavy Nb-doping in SnO_(2) to boost its photocatalytic CO_(2) reduction to C_(2+) products under simulated solar illumination

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Journal of Advanced Ceramics 2022年第9期11卷 1404-1416页

作者： Shuang GAO Haitao GUAN Hongyang WANG Xinhe YANG Weiyi YANG Qi LI Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China

Photocatalytic CO_(2)reduction driven by green solar energy could be a promising approach for the carbon neutral *** this work,a novel defect engineering approach was developed to form the Sn_(x)Nb_(1-x)O_(2)solid solution by the heavy substitutional Nb-doping of SnO_(2)through a robust hydrothermal *** detailed analysis demonstrated that the heavy substitution of Sn^(4+)by a higher valence Nb^(5+)created a more suitable band structure,a better photogenerated charge carrier separation and transfer,and stronger CO_(2)adsorption due to the presence of abundant acid centers and excess electrons on its ***,the Sn_(x)Nb_(1-x)O_(2)solid solution sample demonstrated a much better photocatalytic CO_(2)reduction performance compared to the pristine SnO_(2)sample without the need for sacrificial *** photocatalytic CO_(2)reduction efficiency reached~292.47μmol/(g·h),which was 19 times that of the pristine SnO_(2)***,its main photocatalytic CO_(2)reduction product was a more preferred multi-carbon(C_(2+))compound of C_(2)H_(5)OH,while that of the pristine SnO_(2)sample was a one-carbon(C1)compound of CH_(3)*** work demonstrated that,the heavy doping of high valence cations in metal oxides to form solid solution may enhance the photocatalytic CO_(2)reduction and modulate its reduction process,to produce more C_(2+)*** material design strategy could be readily applied to various material systems for the exploration of high-performance photocatalysts for the solar-driven CO_(2)reduction.

关键词： photocatalytic CO_(2)reduction heavy Nb-doping tin oxide solid solution C^(2+)product

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Multi-solute solid solution behavior and its effect on the properties of magnesium alloys

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Journal of Magnesium and Alloys 2022年第7期10卷 1786-1820页

作者： Jun Wang Yuan Yuan Tao Chen Liang Wu Xianhuan Chen Bin Jiang Jingfeng Wang Fusheng Pan National Engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400000PR China

The low-density magnesium(Mg)alloys are attractive for the application in aerospace,transportation and other weight-saving-required *** mechanical properties and corrosion properties of Mg alloys are the key-property issues for the wide *** is surprising to find that the solid solution of alloying elements in theα-Mg phase can have multi-effects on the properties of Mg alloys,e.g.,solid solution strengthening,solid solution corrosion-resistance-enhancing,***,the alloy design theory of"solid solution strengthening and ductilizing"proposed by Pan and co-workers has attracted extensive *** is promising that by selected proper multi-alloying-elements(with optimal ratio)solid solutioned in theα-Mg phase,the comprehensive properties of Mg alloys can be synergistically *** this work,the solid solution behavior of Mg alloys and the followed solid solution property-enhancing effects were *** mechanisms proposed recently by researchers for these solid solution property-enhancing behaviors were presented,and the related calculations and predictions were also *** is shown the demonstrations of the fundamentals for the solid solution property-enhancing of Mg alloys,especially from the atomic inter-reaction aspects,still require elaborated characterization work and calculation ***,it could be expected that the multi-solute in Mg alloys can bring many possibilities,or,in another saying,"cocktail effects".With understanding the multi-solute interaction behavior and the corresponded solid solution property-enhancing effects,the good balanced high-performance Mg alloys can be developed.

关键词： Mg alloys solid solution Strength Ductility Corrosion-resistance

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Molten-salt synthesis and composition-dependent luminescent properties of barium tungsto-molybdate-based solid solution phosphors

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Chinese Physics B 2016年第2期25卷 482-488页

作者：贺香红叶招莲关明云连宁孙建华 School of Chemistry and Environmental Engineering Jiangsu University of Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC) School of Environment Science and EngineeringNanjing University of Information Science and Technology

Pr^（3＋）-activated barium tungsto-molybdate solid solution phosphor Ba（Mo_（1-z）W_z）O_4：Pr^（3＋）is successfully fabricated via a facile molten-salt approach. The as-synthesized microcrystal is of truncated octahedron and exhibits deep-red-emitting upon blue light excitation. Powder x-ray diffraction and Raman spectroscopy techniques are utilized to investigate the formation of solid solution phosphor. The luminescence behaviors depend on the resulting composition of the microcrystals with fixed Pr^（3＋）-doping concentration, while the host lattices remain in a scheelite structure. The forming solid solution via the substitution of [WO_4] for [MoO_4] can significantly enhance its luminescence, which may be due to the fact that Ba（Mo_（1-z）W_z）O_4：Pr^（3＋）owns well-defined facets and uniform morphologies. Owing to its properties of high phase purity,well-defined facets, highly uniform morphologies, exceptional chemical and thermal stabilities, and stronger emission intensity, the resulting solid solution phosphor is expected to find potential applications in phosphor-converted white lightemitting diodes（LEDs）.

关键词： molten-salt barium tungsto-molybdate microcrystals solid solution deep-red-emitting

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Distribution of P2O5 between solid solution and liquid phase in dephosphorization slag of CaO-SiO2-FeO-P2O5-Na2O system

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Journal of Iron and Steel Research(International) 2019年第11期26卷 1162-1170页

作者： Chuan-ming Du Ning-ning Lv Chang Su Wei-ming Liu Jin-xing Yang Hai-chuan Wang Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendaiMiyagi 980-8577Japan School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243032AnhuiChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling(Anhui University of Technology) Ministry of Education.Ma'anshan 243002Anhui.China

A multi-phase slag containing Na2O is potential to efficiently dephosphorize high-P hot *** dephosphorization,the generated slag with high P2O5 content is regarded as a P *** P2O5 was mainly concentrated in the 2CaO SiO2-3CaO P2O5 solid solution,the recovery of P from dephosphorization slag primarily depends on the separation of the solid solution from other *** distribution ratios of P2O5 between solid solution and liquid phase in the CaOSiO2-FeO-P2O5-Nslag system were *** results indicated that the addition of Na2O facilitated the enrichment of P2O5 in the solid solution because it increased not only the distribution ratio of P2O5 but also the mass fraction of the solid *** distribution ratio of P2O5 was independent of the P2O5 content in slag.A higher P2O5 content in slag resulted in higher P2O5 and Na2O contents in the solid *** distribution ratio of P2O5 increased with the total Fe content in the liquid phase,regardless of the valence of *** increase in the FeO content in slag brought a higher P2O5 content in the solid *** slag basicity increased,the distribution ratio of P2O5 increased,but the P2O5 content in the solid solution decreased.

关键词： Dephosphorization Steelmaking slag Distribution ratio P2O5 2CaO·SiO2-3CaO·P2O5 solid solution

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Synthesis and evaluation as CO2 chemisorbent of the Li5(Al1-xFex)O4 solid solution materials:Effect of oxygen addition

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Journal of Energy Chemistry 2017年第5期26卷 948-955页

作者： Paulina Olavarría Elizabeth Vera Enrique J.Lima Heriberto Pfeiffer Laboratorio de Fisicoquímica y Reactividad de Superficies(LaFReS) Instituto de Investigaciones en MaterialesUniversidad Nacional Autońoma de MexicoCircuito exterior s/nCd.UniversitariaDel.Coyoacan C.P.04510Ciudad de MéxicoMexico

Pentalithium aluminate（β-LiAlO） and the corresponding iron-containing solid solution(Li(AlFe)O)were synthetized by solid-state reaction. All the samples were characterized structural and microstructurally by X-ray diffraction, solid-state nuclear magnetic resonance, scanning electron microscopy, Nadsorption-desorption and temperature-programmed desorption of CO. Results showed that 30 mol% of iron can be incorporated into the β-LiAlOcrystalline structure at aluminum positions. Moreover, iron addition induced morphological and superficial reactivity variations. Li(AlFe)Osamples chemisorbed CObetween 200 and 700 °C, where the superficial chemisorption presented the highest enhancement,in comparison to β-LiAlO. Additionally, Li(AlFe)Osamples sintered at higher temperatures thanβ-LiAlO. Isothermal COchemisorption experiments of β-LiAlOand Li(AlFe)Owere fitted to a first order reaction model, corroborating that iron enhances the COchemisorption, kinetically. When oxygen was added to the gas flow, COchemisorption process was mainly enhanced between 400 and 600 °C for the Li(AlFe)Osample in comparison to β-LiAlO. Hence, Li(AlFe)Osolid solution presented an enhanced COchemisorption process, in the presence and absence of oxygen, in comparison to β-LiAlO.

关键词： Lithium aluminate CO2 chemisorption solid solution Thermogravimetry

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Negative thermal expansion and photoluminescence in solid solution(HfSc)_(0.83)W_(2.25)P_(0.83)O_(12-δ)

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Chinese Physics B 2017年第10期26卷 371-377页

作者：梁源程永光葛向红袁保合郭娟孙强梁二军 Department of Applied Physics Donghua University School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministry of Education of ChinaZhengzhou University

A solid solution of （HfSc）0.83W2.25P0.83O12-δ is synthesized by the high-temperature, solid-state reaction and fast-quenching method. It is shown that it possesses an orthorhombic structure with space group Pmmm （47） and exhibits negative thermal expansion （NTE） property with low anisotropy in thermal expansion. The coefficients of thermal expansion （CTEs） for a, b, and c axes are -1.41×10^-6 K^-1, -2.23×10^-6 K^-1, and -1.87×10^-6 K^-1, respectively. This gives rise to volume and linear CTEs of -3.10×10^-6 K^-1 and -1.03×10^-6 K^-1, respectively. Besides, it exhibits also intense photoluminescence from 360 nm to about 600 nm. The mechanism of NTE and the correlation of the PL with axial thermal expansion property are discussed.

关键词： negative thermal expansion solid solution photoluminescence

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Preparation and characterization of nanosized Gd_xBi_(0.95-x)VO_4:0.05Eu^(3+) solid solution as red phosphor

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Chinese Physics B 2014年第10期23卷 254-260页

作者：易娟邱建备王宇岸周大成 School of Materials Science and Engineering Kunming University of Science and Technology Shenzhen Water (Group) Co. Ltd.

A complete solid solutions with monophasic zircon-type structure of vanadates of formula GdxBio.95-xVO4：0.05Eu3＋（x = 04）.95） are synthesized by combined method of co-precipitation and hydrothermal synthesis. Their microstructures and morphologies are characterized by X-ray powder diffraction and transmission electronic microscope, and the results show that each of all the samples has a monophasic zircon-type structure. The absorption spectrum of the prepared phosphor shows a blue-shift of the fundamental absorption band edge with increasing the gadolinium content. Under UV-light and visible-light excitation, all the prepared phosphors show the typical luminescence properties of Eu3＋ in the zircon-type structure. The emission intensity of GdxBi0.95-xVO4：0.05Eu3＋（x = 0.55） is strongest in all samples under UV-light and visible-light excitations. Finally, the mechanisms of luminescence of Eu3＋ in the GdxBi0.95-xVO4：0.05Eu3＋（x = 0-0.95） solid solutions are analyzed and discussed.

关键词： red phosphor solid solution monophase band gap

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Novel(Ni, Fe)S2/(Ni, Fe)3S4 solid solution hybrid: an efficient electrocatalyst with robust oxygen-evolving performance

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Science China Chemistry 2020年第8期63卷 1030-1039页

作者： Pin Hao Ying Xin Jian Tian Liyi Li Junfeng Xie Fengcai Lei Lili Tong Hong Liu Bo Tang College of Chemistry Chemical Engineering and Materials ScienceInstitute of Materials and Clean EnergyCollaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of ShandongKey Laboratory of Molecular and Nano ProbesMinistry of EducationShandong Provincial Key Laboratory of Clean Production of Fine ChemicalsShandong Normal UniversityJinan 250014China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Intel Corporation HillsboroOR 97124USA

Fabrication of high-activity electrocatalysts with operational stability is desperately needed to achieve efficient energy ***,for the first time,we highlight a novel electrocatalyst based on binary nickel iron sulfide solid solution hybrids on carbon cloth for oxygen evolution *** from the synergistic effect of varied phases and the interfacial connection between(Ni,Fe)S2 and(Ni,Fe)3S4 to accelerate the charge transport,the Ni incorporation to optimize the electronic structure of the hybrids and the downshift of the d-band center to facilitate the desorption of oxygen intermediates,the partial charge-transfer between Fe and Ni to boost the generation of catalytically active Ni3+as well as the unique nanosphere structure to offer enough buffer area for the volume changes during constant redox reactions,the obtained binary nickel iron sulfide hybrids((Ni,Fe)S2/(Ni,Fe)3S4)display high catalytic reactivity with a low overpotential of 210 mV to reach the current density of 10 mA cm-2,and excellent stability with negligible activity deterioration,making the hybrid a promising candidate for electrocatalytic alkaline water oxidation.

关键词： binary nickel iron sulfide hybrids solid solution electrocatalysis oxygen evolution reaction

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Fine controllable blue emission and its mechanism in Ce^(3+)-doped orthosilicate solid solution phosphors for different plant growths

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Journal of Rare Earths 2018年第11期36卷 1150-1156页

作者： Yaru Yang Yiting Lin Yue Han Zhongxian Qiu Wenli Zhou Jilin Zhang Chengzhi Li Liping Yu Shixun Lian Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research (Ministry of Education) Key Laboratory of Sustainable Resources Processing and Advanced Materials of Hunan ProvinceCollege of Chemistry and Chemical EngineeringHunan Normal University

The designed Ce^3＋-doped alkaline-earth silicate phosphors CamSr2 m-nBanSiO4：Ce^3＋,Li^＋（CSBS：Ce^3＋） were synthesized by a high temperature solid-state reaction. The crystal field splitting and the centroid shift from the flee ion energy of 5d configuration were approximated from the spectrum for Ca2SiO4, Sr2SiO4 and Ba2SiO4 phosphors. The single-phase purity was checked by means of X-ray diffraction. Here, when the doped concentration of Ca2. is less than 80% （m 〈 1.6）, we report the structural phase transformation from monoclinic system [3-Ca2Si04 to orthorhombic system α′-Ca2SiO4. The phosphors excited by near-ultraviolet （NUV） light at wavelengths ranging from 200 to 400 nm demonstrate a broad asymmetric blue emission band. The emission peak wavelength redshifts firstly from 417 nm of Ca2SiO4 to 438 nm of Sro.3Cal.6SiO4, and then blueshifts to 411 nm of Sr2SiO4, and the end of 401 nm of Ba2SiOa. These results indicate that the tunable blue-emission of the phosphors can he realized through changing the solid solution components, which has a potential use as a blue component for fabricated precision modulation LEDs light sources and auxiliaries of SSC plastics films for different plant growths. We discuss in detail the possible mechanism and energy diagram of the tunable blue luminescence in CamSr2-M-nBaNSiO4：Ce^3＋.Li^＋ phosphors.

关键词： Ce^3+ Controllable blue emission Alkaline-earth silicate solid solution Plant growth Rare earths

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