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
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
收藏
页码:11127 / 11133
页数:7
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