Exploration of giant piezoelectric materials using high-pressure synthesis and understanding of their mechanisms using thermal measurements

利用高压合成探索巨型压电材料并利用热测量了解其机理

• 批准号: 23740245
• 负责人: TACHIBANA Makoto
• 金额: $ 2.83万
• 依托单位: National Institute for Materials Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23740245/
• 关键词: 構造相転移; 強誘電相転移; 単結晶; 熱測定; Ｘ線散乱; 巨大圧電物質; 酸化物強誘電体; モルフォトロピック相境界; 巨大圧電応答; 熱物性

Many transition metal oxides show interesting ferroelectric and structural phase transitions, as well as useful phenomena such as giant piezoelectric effects. In this study, structural phase transitions in pyrochlore Cd2Nb2O7 and perovskite Pr1-xLaxAlO3 were studied using x-ray scattering and specific heat measurements. Cd2Nb2O7 shows relaxor-like behavior and an unusual sequence of ferroelectric and ferroelastic transitions. Pr1-xLaxAlO3 has Jahn-Teller instabilities and shows unusual ferroelastic transitions. The results provide important perspectives on the emergence of giant piezoelectric effects in related materials.

许多过渡金属氧化物表现出有趣的铁电相变和结构相变，以及诸如巨型压电效应等有用的现象。本文用X射线散射和比热测量方法研究了焦绿石Cd_2Nb_2O_7和钙钛矿Pr_(1-x)La_xAl_3的结构相变。Cd_2Nb_2O_7表现出类弛豫行为和一系列不同寻常的铁电和铁弹相变。Pr_(1-x)La_xAl_2O_3具有Jahn-Teller不稳定性，表现出不寻常的铁弹相变。这一结果为相关材料中巨压电效应的出现提供了重要的视角。

项目成果

Heat capacity of the spinel superconductors CuRh2S4 and CuRh2Se4

尖晶石超导体 CuRh2S4 和 CuRh2Se4 的热容

• DOI: 10.1016/j.ssc.2012.02.019
• 发表时间: 2012
• 期刊: Solid State Commun.
• 作者: 高村秀紀;他7名;M. Tachibana
• 通讯作者: M. Tachibana

Upper critical field

• DOI: 10.1093/acprof:oso/9780199593316.003.0007
• 发表时间: 2011-12
• 作者: R. Klemm

Magnetic and electronic orderings in orthorhombic RMnO3 (R=Tm Lu) studied by resonant soft x-ray powder diffraction

通过共振软 X 射线粉末衍射研究斜方 RMnO3 (R=Tm Lu) 中的磁性和电子排序

• DOI: 10.1103/physrevb.86.054425
• 发表时间: 2012
• 期刊: Phys. Rev. B
• 作者: M. Garganourakis;Y. Bodenthin;R. de Souza;V. Scagnoli;A. Donni;M. Tachibana;H. Kitazawa;E. Takayama-Muromachi and U. Staub
• 通讯作者: E. Takayama-Muromachi and U. Staub

Incoherent Bi off-centering in Bi_2Ti_2O_6O' and Bi_2Ru_2O_6O' : Insulator versus metal

Bi_2Ti_2O_6O 和 Bi_2Ru_2O_6O 中的非相干 Bi 偏心：绝缘体与金属

• 发表时间: 2011
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: D. Shoemaker;R. Seshadri;M. Tachibana;and A. Hector
• 通讯作者: and A. Hector

Reverse Monte Carlo neutron scattering study of the 'ordered-ice' oxide pyrochlore Pb_2Ru_2O_<6.5>

“有序冰”氧化物烧绿石 Pb_2Ru_2O_<6.5> 的逆蒙特卡罗中子散射研究

• 发表时间: 2011
• 期刊: Journal of Physics-Condensed Matter
• 影响因子: 2.7
• 作者: D. P Shoemaker;A. Llobet;M. Tachibana;and R. Seshadri
• 通讯作者: and R. Seshadri