Structure, bonding, and properties of CaZn[sub 1[minus]x]Cd[sub x]Sn and CaSn[sub 0. 5]Ge[sub 1. 5]

Journal Article · Wed Dec 01 00:00:00 EST 1993 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1993.1372· OSTI ID:7198996

Ganguli, A K; Corbett, J D ^[1]

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1. Iowa State Univ., Ames, IA (United States)

CaZnSn, the end member of the CaZn[sub 1-x]Cd[sub x]Sn series, crystallizes in the LiGaGe structure type, an ordered ternary version of CaIn[sub 2] (space group P6[sub 3]mc, Z = 2, a = 4.621(2) [angstrom], c = 7.643(2) [angstrom]). Alternating Zn and Sn form puckered hexagonal layers that are interconnected by 0.40 [angstrom] longer Zn-Sn bonds (around intercalated Ca) to form a distorted wurtzite-like framework. This structure is retained through x = 0.75. The other member, CaCdSn, has the Fe[sub 2]P structure type (space group P62m, Z = 4, a = 7.6319(5), c = 4.6996(4) [angstrom]) and consists of two kinds of augmented trigonal prisms of Ca and Cd centered by different Sn atoms. CaSn[sub 0.52(2)]Ge[sub 1.48(2)] crystallizes in the P6[sub 3]mc space group (a = 4.117(1), c = 10.300 (3) [angstrom]) and has the KSnAs structure, with puckered ordered layers of Sn and Ge separated by calcium. The composition is the tin-rich limit of stability. The CaZn[sub 1[minus]x]Cd[sub x]Sn phases for x = 0, 0.25, 0.50 are weak Pauli paramagnets and metals ([approximately]50 [mu][Omega][center dot]cm at 290 K). Distortions of the hexagonal wurtzite-based matrix by the inserted Ca are thought to be responsible for this unexpected result. CaCdSn and CaSn[sub 0.5]Ge[sub 1.5] are diamagnetic although the former shows a nearly temperature-independent resistivity of [approximately]35 [mu][Omega][center dot] cm.

• OSTI ID: 7198996
• Journal Information: Journal of Solid State Chemistry; (United States), Vol. 107:2; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CADMIUM COMPOUNDS
CRYSTAL STRUCTURE
CALCIUM COMPOUNDS
GERMANIUM COMPOUNDS
TIN COMPOUNDS
ZINC COMPOUNDS
LATTICE PARAMETERS
MAGNETIC PROPERTIES
STOICHIOMETRY
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
PHYSICAL PROPERTIES
SCATTERING
360102* - Metals & Alloys- Structure & Phase Studies
360602 - Other Materials- Structure & Phase Studies
360104 - Metals & Alloys- Physical Properties
360606 - Other Materials- Physical Properties- (1992-)