Electrical anomalies and the localized to delocalized transition for lanthanide pnictides at high pressures

高压下镧系元素磷族元素的电异常和局域到离域转变

• 批准号: 17540310
• 负责人: SHIROTANI Ichimin
• 金额: $ 1.92万
• 依托单位: Muroran Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17540310/
• 关键词: High pressure; Phase transition; X-ray diffraction; Synchrotron radiation; Lanthanide pnictides; Crystal structure; Bulk modulus; X線回折; 粉末X線回折

By use of synchrotron radiation, powder x-ray diffraction of LnBi (Ln = La, Nd, Sm, Gd, Tb, Ho and Tm) with a NaCl-type structure has been studied up to 35 GPa at room temperature. The detailed pressure-volume relationship for SmBi is obtained. The isostructural phase transition reported by Benedict et al. is not found at around 2.6 GPa. However, we have observed a first-order phase transition for SmBi at around 18 GPa. SmBi transforms from the NaCI-type to a tetragonal (distorted CsCl-type) structure with the volume collapse of about 8.2 % at around 18 GPa. Crystal data of the high-pressure phase of SmBi are a = 3.775(5) Å, c = 3.25 (2) Å, c/a = 0.86 and V = 46.4 (3) Å^3 at 20.3 GPa. The structure of SmBi at high pressure is isostructural with that of SmAs. A bulk modulus of SmBi is obtained from the volume vs. pressure curve fitted by a Birch equation of state. The bulk modulus and its pressure derivative of this compound are B_0 = 67 ± 2 GPa, B_0' = 2.6 ± 0.3. We have found also the structural phase transitions for LnBi (Ln = La, Nd, Sm, Gd, Tb, Ho and Tm) at high pressures.

利用同步辐射，研究了nacl型LnBi （Ln = La, Nd, Sm, Gd, Tb， Ho和Tm）在室温下高达35 GPa的粉末x射线衍射。得到了SmBi的详细压力-体积关系。Benedict等人报道的等结构相变在2.6 GPa附近没有发现。然而，我们观察到SmBi在18gpa左右发生了一阶相变。SmBi从naci型转变为四边形（扭曲的csl型）结构，在18gpa左右体积崩塌约8.2%。在20.3 GPa下，SmBi高压相的结晶数据为a = 3.775(5) Å， c = 3.25 (2) Å， c/a = 0.86, V = 46.4 (3) Å^3。高压下SmBi的结构与SmAs的结构是同结构的。SmBi的体积模量由Birch状态方程拟合的体积与压力曲线得到。该化合物的体积模量B_0 = 67±2 GPa, B_0′= 2.6±0.3。我们还发现了LnBi （Ln = La, Nd, Sm, Gd, Tb， Ho和Tm）在高压下的结构相变。

项目成果

X-ray study with synchrotron radiation for one-dimensional complex bis(diphenylglyoximato)platinum(II) at high pressures

高压下一维复合双(二苯基乙肟)铂(II)的同步辐射X射线研究

• 发表时间: 2005
• 期刊: Mol.Cryst.Lig.Cryst. 442
• 作者: I.Shirotani;J.Hayashi;K.Takeda
• 通讯作者: K.Takeda

Shear stress effect on the absorption spectra of organic thin films under high pressure

高压下剪切应力对有机薄膜吸收光谱的影响

• 发表时间: 2006
• 期刊: Mol. Cryst. Lig. Cryst. 455
• 作者: M.;Nakashima;et. al.;城谷 一民;I.Shirotaniら
• 通讯作者: I.Shirotaniら

実験化学講座23「無機化合物」(第5版)、金属の化合物II「リン化物」、「ヒ化物」(日本化学会編)

实验化学第23课《无机化合物》（第5版）、金属化合物II《磷化物》、《砷化物》（日本化学会编）

• 发表时间: 2005
• 作者: Y.Homma;D.Aoki;Y.Haga;H.Sakai;S.Ikeda;E.Yamamoto;A.Nakamura;Y.Shiokawa;Y.Onuki;城谷一民
• 通讯作者: 城谷一民

Structural, optical and electrical properties of one-dimensional bis(dimethylglyoximato)nickel(II), Ni(dmg)_2 at high pressure

一维双(二甲基乙肟)镍(II), Ni(dmg)_2在高压下的结构、光学和电学性质

• 发表时间: 2006
• 期刊: Mol Cryst. Liq. Cryst. 460
• 作者: T.;Ueda;et. al.;K.Takedaら
• 通讯作者: K.Takedaら

X-ray study with synchrotron radiation for filled skutterudite YbFe_4P_<12> at ambient pressure and at high pressures

常压和高压下填充方钴矿 YbFe_4P_<12> 的同步辐射 X 射线研究

• 发表时间: 2006
• 期刊: Physica B 382
• 作者: A. Thamizhavel;et. al.;I.Shirotaniら
• 通讯作者: I.Shirotaniら