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Electromechanical-induced antiferroelectric-ferroelectric phase transition in PbLa(Zr,Sn,Ti)O_3 ceramic

Chinese Physics B 2011年第9期20卷 430-434页

作者：张崇辉徐卓高俊杰朱长军姚熹 School of Science Xi'an Polytechnic University Electronic Materials Research Laboratory Key Laboratory of the Ministry of EducationXi'an Jiaotong University

antiferroelectric ferroelectric （AFE-FE） phase transition in ceramic Pbo.97Lao.02（Zro.75Snon36Tion14）O3 （PLZST） was studied by dielectric spectroscopy as functions of frequency （102-105 Hz） and pressure （0-500 MPa） under a DC electric field. The hydrostatic pressure-dependent remnant polarization and dielectric constant were mea- sured. The results show that remnant polarization of the metastable rhombohedral ferroelectric PLZST poled ceramic decreases sharply and depoles completely at phase transition under hydrostatic pressure. The dielectric constant um dergoes an abrupt jump twice during a load and unload cycle under an electric field. The two abrupt jumps correspond to two phase transitions, FE AFE and AFE-FE.

关键词： antiferroelectric ceramic dielectric constant hydrostatic pressure phase transition

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Enhanced energy storage properties and antiferroelectric stability of Mn-doped NaNbO_(3)-CaHfO_(3) lead-free ceramics:Regulating phase structure and tolerance factor

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Journal of Materiomics 2022年第3期8卷 611-617页

作者： Yang Yin Jing-Ru Yu Yu-Cheng Tang Ai-Zhen Song Huan Liu Dong Yang Jing-Feng Li Lei Zhao Bo-Ping Zhang School of Materials Science and Engineering University of Science and Technology Beijing100083BeijingChina School of Materials Science and Engineering Tsinghua University100084BeijingChina College of Physics Science and Technology Hebei University071002BaodingChina

NaNbO_(3)-based ceramics usually show ferroelectric-like P-E loops at room temperature due to the irreversible transformation of the antiferroelectric orthorhombic phase to ferroelectric orthorhombic phase,which is not conducive to energy storage *** previous work found that incorporating CaHfO_(3) into NaNbO_(3) can stabilize its antiferroelectric phase by reducing the tolerance factor(t),as indicated by the appearance of characteristic double P-E ***,a small amount of MnO_(2) addition effectively regulate the phase structure and tolerance factor of 0.94NaNbO_(3)-0.06CaHfO_(3)(0.94NN-0.06CH),which can further improve the stability of *** XRD and XPS results reveal that the Mn ions preferentially replace A-sites and then B-sites as increasing MnO_(2).The antiferroelectric orthorhombic phase first increases and then decreases,while the t shows the reversed trend,thus an enhanced antiferroelectricity and the energy storage density Wrec of 1.69 J/cm^(3) at 240 kV/cm are obtained for 0.94NN-0.06CH-0.5%MnO_(2)(in mass fraction).With the increase of Mn content to 1.0%from 0.5%,the efficiency increases to 81% from 45%,although the energy storage density decreases to 1.31 J/cm^(3) due to both increased tolerance factor and non-polar phase.

关键词： NaNbO_(3) antiferroelectric ceramic Tolerance factor Energy-storage density

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Release of charges under external fields of PbLa(Zr,Sn,Ti)O_3 ceramic

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Chinese Physics B 2011年第2期20卷 500-502页

作者：张崇辉徐卓高俊杰姚熹 Electronic Materials Research Laboratory Key Laboratory of the Ministry of EducationXi'an Jiaotong University School of Science Xi'an Polytechnic University

This paper investigates the pyroelectric of poled antiferroelectric （AFE） ceramic Pbo.97Lao.02 （Zro.69Sno.196 Ti0.114）03 and its remnant polarization dependence of hydrostatic pressure. The results show that the bound charges of poled sample can be released in short time by temperature field or pressure field. The released charge abruptly forms a large pulse current. The phenomena of released charge under external fields result in the ferroelectric-AFE phase transition induced by temperature or hydrostatic pressure.

关键词： antiferroelectric ceramic pyroelectric hydrostatic pressure phase transition

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基于 PSZT的 RAINBOW型驱动器研究(英文)

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Chinese Journal of Aeronautics 2002年第3期15卷 176-180页

作者：沈星万建国 The Key Laboratory for Smart Materials & Structures Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

A new type of large\|displacement actuator called RAINBOW (Reduced And Internally Biased Oxide Wafer) was fabricated by a chemical reduction of PSZT antiferroelectric ceramic. It is found that PSZT was easily reduced and the optimal conditions for producing RAINBOW samples were determined to be 870℃ for 2~3 h. The AFE\|FE phase transitions occur at lower field strength in RAINBOWs compared with normal PSZT. Larger axial displacement (about 190μm) was obtained from the RAINBOWs by application of electric ...

关键词： actuator RAINBOW chemical reduction antiferroelectric ceramic phase switching

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