High-temperature modification of Y5Sb3 and its ternary analogue Y5NixSb3−x

The high-temperature modification of Y5Sb3 has been discovered: the Yb5Sb3 structure type, Pnma space group, a=11.867(1), b=9.2247(9) and c=8.0977(8) Å. It has been estimated that the first-order structural transition from the low-temperature form (Mn5Si3 type) to the high-temperature form is above 1265°C but below 1400°C. Antimony atoms on one of the two sites can be partially substituted by Ni atoms, which results in a Y5NixSb3−x formula with …