TY - JOUR
T1 - Formation of transition metal boride and carbide perovskites related to superconducting MgCNi3
AU - Schaak, R. E.
AU - Avdeev, M.
AU - Lee, W. L.
AU - Lawes, G.
AU - Zandbergen, H. W.
AU - Jorgensen, J. D.
AU - Ong, N. P.
AU - Ramirez, A. P.
AU - Cava, R. J.
N1 - Funding Information:
The work at Princeton University was supported by the US Department of Energy, grant DE-FG02-98ER45706, along with funds from NSF-MRSEC grant DMR 0213706. The work at Argonne National Laboratory was supported by the US Department of Energy, Office of Basic Energy Sciences—Materials Sciences, under contract No. W-31-109-ENG-38. Work at Los Alamos was supported by a Laboratory-Directed Research and Development grant. HWZ acknowledges financial support by Stichting voor Fundamenteel Onderzoek der Materie (FOM).
PY - 2004/4
Y1 - 2004/4
N2 - 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, MgC xRh3, LuCxRh3, and ZrC xRh3 represent new intermetallic perovskites that form at a composition that is nominally stoichiometric (x=1). ScBxPd 3, 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 CaB xPd3 is not actually stoichiometric at a nominal composition of x=1. Rather, saturation of the boron content occurs at CaB 0.76Pd3. Evidence for superconductivity was found in samples of CaBxPd3 (x≥1) and NbBxRh 3, but bulk analysis suggests that superconductivity may be attributed to minority phases.
AB - 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, MgC xRh3, LuCxRh3, and ZrC xRh3 represent new intermetallic perovskites that form at a composition that is nominally stoichiometric (x=1). ScBxPd 3, 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 CaB xPd3 is not actually stoichiometric at a nominal composition of x=1. Rather, saturation of the boron content occurs at CaB 0.76Pd3. Evidence for superconductivity was found in samples of CaBxPd3 (x≥1) and NbBxRh 3, but bulk analysis suggests that superconductivity may be attributed to minority phases.
KW - Crystal structure
KW - Intermetallic perovskite
KW - Intermetallic superconductor
KW - Neutron diffraction
KW - Substoichiometric compounds
KW - Superconductivity
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U2 - 10.1016/j.jssc.2003.10.032
DO - 10.1016/j.jssc.2003.10.032
M3 - Article
AN - SCOPUS:1642503858
SN - 0022-4596
VL - 177
SP - 1244
EP - 1251
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
IS - 4-5
ER -