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Communications in Theoretical Physics 2005年第5期43卷 855-860页

作者： ZHANGDuan-Ming ZHONGZhi-Cheng HANXiang-Yun YANWen-Sheng SUNHong-Zhang YANGFeng-Xia ZHENGKe-Yu WEINian LIZhi-Huai DepartmentofPhysics HuazhongUniversityofScienceandTechnologyWuhan430074China／／FacultyofPhysicsandElectronicTechnologyHubeiUniversityWuhan430062China DepartmentofPhysics HuazhongUniversityofScienceandTechnologyWuhan430074China／／DepartmentofPhysicsXiangfanCollegeXiangfan441053China

In this paper, the relation between the dielectric properties and the lattice distortion in the phase coexistence region is discussed using a phase statistical distribution model, and in the rhombohedral phase region the two connection equations on the dielectric properties and the lattice distortion are established. Particularly, the relation between the dielectric properties and the lattice distortion is investigated in the phase coexistence region of PZT ceramics, and the fitting value of the volume fraction of the tetragonal phase VT to composition x in the equation is determined. Further,the fitting results are well consistent with the related experimental data. It involves more profound physical process than relation between the dielectric properties and composition x.

关键词： lattice distortion dielectric properties rhombohedral phase phasecoexistence PZT

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Ferroelectricity Induced by Oxygen Vacancies in rhombohedral ZrO2 Thin Films

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Energy & Environmental Materials 2024年第1期7卷 233-241页

作者： Veniero Lenzi José P.B.Silva Physics Center of Minho and Porto Universities (CF-UM-UP) University of Minho Laboratory of Physics for Materials and Emergent Technologies Lap METUniversity of Minho National Institute of Materials Physics Department of Materials Science and Metallurgy

rhombohedral phase HfxZr1-xO2（HZO,x from 0 to 1） films are promising for achieving robust ferroelectric polarization without the need for an initial wake-up pre-cycling,as is normally the case for the more commonly ... 详细信息

关键词： charged defects ferroelectric polarization rhombohedral phase stability zirconia

phase composition,conductivity,and sensor properties of cerium-doped indium oxide

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Nano Materials Science 2024年第2期6卷 193-200页

作者： M.I.Ikim G.N.Gerasimov V.F.Gromov O.J.Ilegbusi L.I.Trakhtenberg N.N.Semenov Federal Research Center for Chemical Physics of RAS MoscowRussia University of Central Florida OrlandoFLUSA Moscow Institute of Physics and Technology(State University) DolgoprudnyMoscow RegionRussia Lomonosov Moscow State University MoscowRussia

The hydrothermal synthesis of In_(2)O_(3)and CeO_(2)–In_(2)O_(3)is investigated as well as the properties of sensor layers based on these *** the synthesis of In_(2)O_(3),intermediate products In(OH)_(3)and InOOH are formed,which are the precursors of stable cubic(c-In_(2)O_(3))and metastable rhombohedral(rh-In_(2)O_(3))phases,respectively.A transition from c-In_(2)O_(3)to rh-In_(2)O_(3)is observed with the addition of CeO_(2).The introduction of cerium into rh-In_(2)O_(3)results in a decrease in the sensor response to hydrogen,while it increases in composites based on c-In_(2)O_(3).The data on the sensor activity of the composites correlate with XPS results in which CeO_(2)causes a decrease in the concentrations of chemisorbed oxygen and oxygen vacancies in rh-In_(2)O_(3).The reverse situation is observed in composites based on c-In_(2)O_(3).Compared to In_(2)O_(3)and CeO_(2)–In_(2)O_(3)obtained by other methods,the synthesized composites demonstrate maximum response to H_(2)at low temperatures by 70–100℃,and have short response time(0.2–0.5 s),short recovery time(6–7 s),and long-term stability.A model is proposed for the dependence of sensitivity on the direction of electron transfer between In_(2)O_(3)and CeO_(2).

关键词： Cerium oxide Indium oxide Nanocomposite Hydrothermal method Cubic phase rhombohedral phase Sensor response Conductivity Hydrogen Response/recovery time

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Sr2+-doped rhombohedral LiHf2(PO4)3 solid electrolyte for allsolid-state Li-metal battery

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Rare Metals 2020年第9期39卷 1092-1098页

作者： Qing-Hui Li Chang Xu Bing Huang Xin Yin College of Electrical and Information Engineering Hunan UniversityChangsha 410082China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China

Solid-state electrolytes in rechargeable all-solidstate Li-metal batteries,which have better safety and higher specific capacity than conventional rechargeable Liion batteries with liquid electrolytes,are limited by the low Li-ion conductivity of the solid electrolyte and the large electrolyte/electrode interfacial ***,we report a new rhombohedral NAS ICON structure Li1.4Sr0.2Hf1.8(PO4)3 with a high Li-ion conductivity of 1.62×10-5 S·cm-1 at 25℃,and its conductivity can be improved to 3.4×10-5 S·cm-1 after the densification of the pellet by hot ***1.4Sr0.2Hf1.8(PO4)3 coated by a thin layer of polymer electrolyte showed a stable lowimpedance dendrite-free plating/stripping process in a symmetric Li/Li cell for 100 h;moreover,the Li1.4Sr0.2Hf1.8(PO4)3 electrolyte had a small interfacial resistance in all-solid-state Li/LiFePO4 cell,which allows a high Coulombic efficiency and good cycling of the cell.

关键词： Solid-state electrolyte NASICON rhombohedral phase Interfacial resistance All-solid-state battery

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