Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/10030
Title: Formation of transition metal boride and carbide perovskites related to superconducting MgCNi3
Authors: Schaak, RE
Avdeev, M
Lee, WL
Lawes, G
Zandbergen, HW
Jorgensen, JD
Ong, NP
Ramirez, AP
Cava, RJ
Keywords: Superconductors
Intermetallic compounds
Perovskite
Neutron diffraction
Crystal structure
Stoichiometry
Issue Date: 1-Apr-2004
Publisher: Elsevier
Citation: Schaak, R. E., Avdeev, M., Lee, W.-L., Lawes, G., Zandbergen, H. W., Jorgensen, J. D., Ong, N. P., Ramirez, A. P., & Cava, R. J. (2004). Formation of transition metal boride and carbide perovskites related to superconducting MgCNi3. Journal of Solid State Chemistry, 177(4–5), 1244-1251. doi:10.1016/j.jssc.2003.10.032
Abstract: A general study of the formation of intermetallic perovskite borides and carbides in the ternary systems AXM3 (A=Mg, Ca, Sc, Y, Lu, Zr, Nb; X=B, C; M=Ni, Ru, Rh, Pd, Pt) is reported. MgBxPd3, MgBxPt3, CaBxPd3, MgCxRh3, LuCxRh3, and ZrCxRh3 represent new intermetallic perovskites that form at a composition that is nominally stoichiometric (x=1). ScBxPd3, YBxPd3, and NbBxRh3 are new single-phase perovskites that form only at a substoichiometric (x<1) nominal composition. The variable boron content of ABxPd3 (A=Mg, Ca, Sc, Y) was studied using lattice parameter data from X-ray diffraction measurements. For A=Ca and Mg, the unit cell volume increases with increasing boron content for 0.25⩽x⩽1.0, while boron uptake is limited to 0⩽x⩽0.5 for A=Sc and Y. Neutron diffraction studies indicate that CaBxPd3 is not actually stoichiometric at a nominal composition of x=1. Rather, saturation of the boron content occurs at CaB0.76Pd3. Evidence for superconductivity was found in samples of CaBxPd3 (x⩾1) and NbBxRh3, but bulk analysis suggests that superconductivity may be attributed to minority phases. © 2003 Elsevier Inc.
URI: https://doi.org/10.1016/j.jssc.2003.10.032
https://apo.ansto.gov.au/dspace/handle/10238/10030
ISSN: 0022-4596
Appears in Collections:Journal Articles

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