Structure and properties of single crystalline CaMg2Bi 2, EuMg2Bi2, and YbMg2Bi2

Andrew F. May; Michael A. McGuire; David J. Singh; Radu Custelcean; Gerald E. Jellison

doi:10.1021/ic2016808

Structure and properties of single crystalline CaMg₂Bi ₂, EuMg₂Bi₂, and YbMg₂Bi₂

Andrew F. May, Michael A. McGuire, David J. Singh, Radu Custelcean, Gerald E. Jellison

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Abstract

Single crystals of CaMg₂Bi₂, EuMg₂Bi ₂, and YbMg₂Bi₂ were obtained from a Mg-Bi flux cooled to 650 °C. These materials crystallize in the CaAl ₂Si₂ structure-type (P3̄m1, 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) × 10¹⁹ cm^-3 for CaMg₂Bi₂, 1.7(1) × 10¹⁹ cm^-3 for EuMg₂Bi ₂, and 4.6(7) × 10¹⁹ cm^-3 for YbMg ₂Bi₂, which are independent of temperature to 5 K. The electrical resistivity decreases with decreasing temperature and the resistivity ratios ρ(300 K)/ρ(10 K) ≥ 1.6 in all cases, indicating significant defect scattering.

Original language	English
Pages (from-to)	11127-11133
Number of pages	7
Journal	Inorganic Chemistry
Volume	50
Issue number	21
DOIs	https://doi.org/10.1021/ic2016808
State	Published - Nov 7 2011

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title = "Structure and properties of single crystalline CaMg2Bi 2, EuMg2Bi2, and YbMg2Bi2",

abstract = "Single crystals of CaMg2Bi2, EuMg2Bi 2, and YbMg2Bi2 were obtained from a Mg-Bi flux cooled to 650 °C. These materials crystallize in the CaAl 2Si2 structure-type (P{\=3}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) × 1019 cm-3 for CaMg2Bi2, 1.7(1) × 1019 cm-3 for EuMg2Bi 2, and 4.6(7) × 1019 cm-3 for YbMg 2Bi2, which are independent of temperature to 5 K. The electrical resistivity decreases with decreasing temperature and the resistivity ratios ρ(300 K)/ρ(10 K) ≥ 1.6 in all cases, indicating significant defect scattering.",

author = "May, {Andrew F.} and McGuire, {Michael A.} and Singh, {David J.} and Radu Custelcean and Jellison, {Gerald E.}",

year = "2011",

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doi = "10.1021/ic2016808",

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volume = "50",

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journal = "Inorganic Chemistry",

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T1 - Structure and properties of single crystalline CaMg2Bi 2, EuMg2Bi2, and YbMg2Bi2

AU - May, Andrew F.

AU - McGuire, Michael A.

AU - Singh, David J.

AU - Custelcean, Radu

AU - Jellison, Gerald E.

PY - 2011/11/7

Y1 - 2011/11/7

N2 - Single crystals of CaMg2Bi2, EuMg2Bi 2, and YbMg2Bi2 were obtained from a Mg-Bi flux cooled to 650 °C. These materials crystallize in the CaAl 2Si2 structure-type (P3̄m1, 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) × 1019 cm-3 for CaMg2Bi2, 1.7(1) × 1019 cm-3 for EuMg2Bi 2, and 4.6(7) × 1019 cm-3 for YbMg 2Bi2, which are independent of temperature to 5 K. The electrical resistivity decreases with decreasing temperature and the resistivity ratios ρ(300 K)/ρ(10 K) ≥ 1.6 in all cases, indicating significant defect scattering.

AB - Single crystals of CaMg2Bi2, EuMg2Bi 2, and YbMg2Bi2 were obtained from a Mg-Bi flux cooled to 650 °C. These materials crystallize in the CaAl 2Si2 structure-type (P3̄m1, 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) × 1019 cm-3 for CaMg2Bi2, 1.7(1) × 1019 cm-3 for EuMg2Bi 2, and 4.6(7) × 1019 cm-3 for YbMg 2Bi2, which are independent of temperature to 5 K. The electrical resistivity decreases with decreasing temperature and the resistivity ratios ρ(300 K)/ρ(10 K) ≥ 1.6 in all cases, indicating significant defect scattering.

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DO - 10.1021/ic2016808

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SN - 0020-1669

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JO - Inorganic Chemistry

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IS - 21

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Structure and properties of single crystalline CaMg₂Bi ₂, EuMg₂Bi₂, and YbMg₂Bi₂

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