Acta Cryst. (2004). B60, 282-286 [doi:10.1107/S0108768104007475]
Abstract: The crystalline structures of the superionic high-temperature copper selenides Cu2-xSe (0 < x < 0.25) produced using mechanical alloying were investigated using X-ray diffraction (XRD). The measured XRD patterns showed the presence of peaks corresponding to the crystalline superionic high-temperature ![[alpha]](/logos/entities/alpha_rmgif.gif)
-Cu2Se phase in the as-milled sample, and its structural data were determined by means of a Rietveld refinement procedure. After heat treatment in argon at 473 K for 90 h, this phase transforms to the superionic high-temperature -Cu1.8Se phase, whose structural data were also determined by Rietveld refinement. In this phase, a very low occupation of the trigonal 32(f) sites (
3%) by Cu ions is found. In order to explain the evolution of the phases in the samples, two possible mechanisms are suggested: (i) the high mobility of Cu ions in superionic phases and (ii) the important diffusive processes in the interfacial component of samples produced by mechanical alloying.
Online 17 May 2004
 |   Structure factor file (CIF format) (31.3 kbytes) |
| Structure factor file (CIF format) (26.6 kbytes) |
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