Resumen de Preparation, thermal analysis, and crystal structure refinement of the quaternary alloy (CuIn)_(2)NbTe_(5)

Pedro Grima Gallardo, M. Palmera, Jennifer A. Aitken, J. Cisterna, I. Brito, Gerzon E. Delgado

• The quaternary alloy (CuIn)_(2)NbTe_5) was synthesized by solid-state reaction using the melt and annealing technique. The thermal análisis shows that this compound melts at 1026 K. The present alloy is isotypic with Cu_(2)FeIn_(2)Se_(5) and crystallizes in the space group P ̄42c(N◦112),with unit cell parameters a = 6.1964(2) Å, c = 12.4761(4) Å, c/a = 2.01, V = 479.02(3) Å^(3). (CuIn)_(2)NbTe_(5), belonging to the system (CuInSe_(2))_(1−x)(FeSe)_(x) with x = 1/3, is a new adamantane compound with a P−chalcopyrite structure. This structure is characterized by a double alternation of anions-cations layers according to the Te-Te: Nb-In-Nb-In: Cu-In-Cu-In: Te-Te sequence, along the 010 direction.