Crystal structure and physical properties of new Ca2TGe3 (T = Pd and Pt) germanides

被引：8

作者：

Klimczuk, T. ^{[1
]}

Xie, Weiwei ^{[2
]}

Winiarski, M. J. ^{[1
]}

Koziol, R. ^{[1
]}

Litzbarski, L. S. ^{[1
]}

Luo, Huixia ^{[2
]}

Cava, R. J. ^{[2
]}

机构：

[1] Gdansk Univ Technol, Fac Appl Phys & Math, Narutowicza 11-12, PL-80233 Gdansk, Poland

[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2016年 / 243卷

关键词：

AlB2-type structure; Intermetallic compounds; Germanides; ELECTRONIC-STRUCTURE; SUPERCONDUCTIVITY; STATES; HO; ER; ND;

D O I：

10.1016/j.jssc.2016.07.029

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The crystallographic, electronic transport and thermal properties of Ca2PdGe3 and Ca2PtGe3 are reported. The compounds crystalize in an ordered variant of the AlB2 crystal structure, in space group P6/mmm, with the lattice parameters a = 8.4876(4) angstrom/8.4503(5) angstrom and c = 4.1911(3) angstrom/4.2302(3) angstrom for Ca2PdGe3 and Ca2PtGe3, respectively. The resistivity data exhibit metallic behavior with residual-resistivity-ratios (RRR) of 13 for Ca2PdGe3 and 6.5 for Ca2PtGe3. No superconducting transition is observed down to 0.4 K. Specific heat studies reveal similar values of the Debye temperatures and Sommerfeld coefficients: Theta(D) = 298 K, gamma = 4.1 mJ mol(-1) K-2 and Theta(D) = 305 K, gamma = 3.2 mJ mol(-1) K-2 for Ca2PdGe3 and Ca2PtGe3, respectively. The low value of gamma is in agreement with the electronic structure calculations. (C) 2016 Elsevier Inc. All rights reserved.

引用

页码：95 / 100

页数：6

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