Structure and Properties of Single Crystalline CaMg2Bi2, EuMg2Bi2, and YbMg2Bi2

被引：77

作者：

May, Andrew F. ^{[1
]}

McGuire, Michael A. ^{[1
]}

Singh, David J. ^{[1
]}

Custelcean, Radu ^{[2
]}

Jellison, Gerald E., Jr. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[2] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA

来源：

INORGANIC CHEMISTRY | 2011年 / 50卷 / 21期

关键词：

GENERALIZED GRADIENT APPROXIMATION; ZINTL PHASE; TRANSPORT-PROPERTIES; PHYSICAL-PROPERTIES; EFFICIENCY; CAAL2SI2; SOLIDS; SB;

D O I：

10.1021/ic2016808

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Single crystals of CaMg2Bi2, EuMg2Bi2, and YbMg2Bi2 were obtained from a Mg-Bi flux cooled to 650 degrees C. These materials crystallize in the CaAl2Si2 structure-type (P (3) over bar m1, No. 164), and crystal structures are reported from refinements of single crystal and powder X-ray diffraction data. EuMg2Bi2 displays an antiferromagnetic transition near 7 K, which is observed via electrical resistivity, magnetization, and specific heat capacity measurements. Magnetization measurements on YbMg2Bi2 reveal a weak diamagnetic moment consistent with divalent Yb. Despite charge-balanced empirical formulas, all three compounds are p-type conductors with Hall carrier concentrations of 2.0(3) x 10(19) cm(-3) for CaMg2Bi2, 1.7(1) x 10(19) cm(-3) for EuMg2Bi2, and 4.6(7) x 10(19) cm(-3) for YbMg2Bi2, which are independent of temperature to 5 K. The electrical resistivity decreases with decreasing temperature and the resistivity ratios rho(300 K)/rho(10 K) <= 1.6 in all cases, indicating significant defect scattering.

引用

页码：11127 / 11133

页数：7

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