1. Thermal stability of the layered modification of Cu0.5ZrTe2 in the temperature range 25–900 °C
- Author
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Alexander Titov, Jasper R. Plaisier, Alexey S. Shkvarin, Lara Gigli, E. G. Shkvarina, and A. A. Titov
- Subjects
Zirconium ,chemistry.chemical_element ,02 engineering and technology ,Crystal structure ,Atmospheric temperature range ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Copper ,Inorganic Chemistry ,Crystallography ,chemistry ,0103 physical sciences ,Materials Chemistry ,Thermal stability ,Crystallite ,Physical and Theoretical Chemistry ,010306 general physics ,0210 nano-technology ,Tellurium ,Powder diffraction - Abstract
The thermal stability of the layered modification of the Cu0.5ZrTe2 polycrystalline intercalation compound, synthesized at room temperature, has been studied in the temperature range 25–900 °C. A change in the occupation of the octahedral and tetrahedral coordinated sites in the interlayer space of the zirconium ditelluride was observed using in-situ time-resolved synchrotron X-ray powder diffraction experiments. The formation of the rhombohedral CuZr2Te4 phase, which is stable in the temperature range 300–700 °C, has been observed. The copper intercalation at room temperature leads to the formation of a phase in which the Cu atoms occupy only octahedral sites in the interlayer space. At temperatures above the decay temperature of the rhombohedral CuZr2Te4, a layered phase with Cu atoms uniformly distributed between octahedral and tetrahedral sites in the interlayer space is stable. The changes in the crystal structure independent of temperature are in agreement with the previously proposed model, according to which the stability of the layered or the rhombohedral phase is determined by the entropy factor associated with the distribution of the intercalated atoms between the octahedral and tetrahedral sites in the interlayer space.
- Published
- 2018