Crystal structure and physical properties of new Ca{sub 2}TGe{sub 3} (T = Pd and Pt) germanides

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2016.07.029· OSTI ID:22658087

Xie, Weiwei ^[1]; Winiarski, M. J.; Kozioł, R.; Litzbarski, L. S. ^[2]; Luo, Huixia; Cava, R. J. ^[1]

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1. Department of Chemistry, Princeton University, Princeton, NJ 08544 (United States)
2. Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza 11/12, 80–233 Gdansk (Poland)

The crystallographic, electronic transport and thermal properties of Ca{sub 2}PdGe{sub 3} and Ca{sub 2}PtGe{sub 3} are reported. The compounds crystalize in an ordered variant of the AlB{sub 2} crystal structure, in space group P6/mmm, with the lattice parameters a = 8.4876(4) Å/8.4503(5) Å and c = 4.1911(3) Å/4.2302(3) Å for Ca{sub 2}PdGe{sub 3} and Ca{sub 2}PtGe{sub 3}, respectively. The resistivity data exhibit metallic behavior with residual-resistivity-ratios (RRR) of 13 for Ca{sub 2}PdGe{sub 3} and 6.5 for Ca{sub 2}PtGe{sub 3}. No superconducting transition is observed down to 0.4 K. Specific heat studies reveal similar values of the Debye temperatures and Sommerfeld coefficients: Θ{sub D} = 298 K, γ = 4.1 mJ mol{sup −1} K{sup −2} and Θ{sub D} = 305 K, γ = 3.2 mJ mol{sup −1} K{sup −2} for Ca{sub 2}PdGe{sub 3} and Ca{sub 2}PtGe{sub 3}, respectively. The low value of γ is in agreement with the electronic structure calculations.

• OSTI ID: 22658087
• Journal Information: Journal of Solid State Chemistry, Vol. 243; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ALUMINIUM BORIDES
CALCIUM COMPOUNDS
CRYSTALS
ELECTRONIC STRUCTURE
GERMANIDES
HEXAGONAL LATTICES
LATTICE PARAMETERS
PALLADIUM COMPOUNDS
PLATINUM COMPOUNDS
SPACE GROUPS
SPECIFIC HEAT
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0273-0400 K