Structure and physical properties of nonstoichiometric rare-earth cadmium antimonides, RECd{sub 1-x}Sb{sub 2} (RE=La, Ce, Pr, Nd, Sm)

Journal Article · Mon May 15 04:00:00 EDT 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.01.071· OSTI ID:20785016

Tkachuk, Andriy V ^[1]; Zelinska, Oksana Ya ^[1]; Mar, Arthur ^[1]

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1. Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2 (Canada)

The ternary rare-earth cadmium antimonides RECd{sub 1-x}Sb{sub 2} (RE=La, Ce, Pr, Nd, Sm) were prepared by reaction of the elements at 1000 deg. C. The presence of Cd defects, previously found for LaCd{sub 0.700(5)}Sb{sub 2} and CeCd{sub 0.660(4)}Sb{sub 2}, has been confirmed by single-crystal X-ray diffraction studies for the isotypic compounds PrCd{sub 0.665(3)}Sb{sub 2}(a=4.3592(3)A, c=10.8619(7)A), NdCd{sub 0.659(3)}Sb{sub 2}(a=4.3456(4)A, c=10.8372(9)A), and SmCd{sub 0.648(3)}Sb{sub 2}(a=4.3185(4)A, c=10.7843(11)A). These compounds adopt the HfCuSi{sub 2}-type structure (Pearson symbol tP8, space group P4/nmm, Z=2). The electrical and magnetic properties of samples with nominal composition RECd{sub 0.7}Sb{sub 2} were investigated. All exhibit metallic behaviour, but CeCd{sub 0.7}Sb{sub 2} undergoes an abrupt drop in its electrical resistivity below 3K. LaCd{sub 0.7}Sb{sub 2} exhibits temperature-independent Pauli paramagnetism and SmCd{sub 0.7}Sb{sub 2} displays van Vleck paramagnetism. The remaining compounds obey the modified Curie-Weiss law at high temperatures. CeCd{sub 0.7}Sb{sub 2} undergoes ferromagnetic ordering below 3K, reaching a saturation magnetization of {approx}1.0{mu}{sub B}, whereas PrCd{sub 0.7}Sb{sub 2} and NdCd{sub 0.7}Sb{sub 2} remain paramagnetic down to 2K.

• OSTI ID: 20785016
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 5 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CADMIUM COMPOUNDS
ELECTRIC CONDUCTIVITY
MAGNETIC PROPERTIES
MONOCRYSTALS
PARAMAGNETISM
RARE EARTH COMPOUNDS
SPACE GROUPS
TETRAGONAL LATTICES
X-RAY DIFFRACTION