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Crystal structures of La3ZrSb5, La3HfSb5, and LaCrSb3· Structural relationships in ternary rare-earth antimonides

1997; Elsevier BV; Volume: 249; Issue: 1-2 Linguagem: Inglês

10.1016/s0925-8388(96)02630-8

1873-4669

Michael J. Ferguson, Ryan W. Hushagen, Arthur Mar,

Iron-based superconductors research

The crystal structures of the ternary rare-earth antimonides La36ZrSb5, La3HfSb5, and LaCrSb3 have been determined from single-crystal X-ray data (La3ZrSb5: P63/mcm, Z=2, a=9.5743(9) Å, c=6.3495(7) Å, V=504.1(1) Å3, T=-60°C. La3fSb5: P63/mcm, Z=2, a = 9.557(2) Å, c = 6.3388(6) Å, V=501.4(1) Å3, T=-60°C. LaCrSb3: Pbcm, Z=4, a=13.2835(7) Å, b = 6.2127(2) Å, c=6.116(l) Å, 7=504.8(1) Å3T=22 °C.) The structure of La3MSb5 (M=Zr, Hf) consists of chains of Sb atoms and chains of face-sharing MSb6 octahedra, separated by La atoms. LaCrSb3 is isostructural to CeCrSb3, and consists of nearly square sheets of Sb atoms and layers efface- and edge-sharing CrSb6 octahedra, separated by the rare-earth atoms. The RECrSb3 series, previously shown to exist for RE=La, Ce, Pr, Nd, Sm, has now been extended to include RE=Gd, Tb, Dy. Structural relationships between various ternary rare-earth antimonides are drawn.