Crystal Structure of New Compounds, Cu₆O₈Cu₂X (X=Cl, NO₃)

Abstract

Crystal structure analyses of new compounds, Cu 6 O 8 Cu 2 X (X=Cl, NO 3 ), have been carried out using the X-ray powder pattern fitting method (Rietveld method) together with thermal analyses. Although these compounds have a face-centered cubic structure analogous to that of Cu 6 O 8 InCl previously reported with a space group of Fm3̄m, the Cu 2 (24e site) ions have a quite different configuration from that of the corresponding In ion. From the results of the above-mentioned analyses together with chemical analyses, the compositions of these samples were obtained as Cu 5.7 O 8 Cu 1.9 Cl 0.69 (NO 3 ) 0.31 and Cu 5.7 O 8 Cu 1.9 NO 3 , respectively. The unit cell parameters are a =9.376(1) Å for the former and 9.481(1) Å for the latter. These compounds decompose to CuO at 400°C and 350°C, respectively.