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An Electron and X-Ray Diffraction Investigation of Ni1+xTe2 and Ni1+xSe2CdI2/NiAs Type Solid Solution Phases

✍ Scribed by L. Norén; V. Ting; R.L. Withers; G. Van Tendeloo

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
643 KB
Volume
161
Category
Article
ISSN
0022-4596

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✦ Synopsis

The reported wide-range nonstoichiometric Ni 1؉x Te 2 , 04 4 x4 40.83, and Ni 1؉x Se 2 , 0.574 4x4 40.92, CdI 2 /NiAs structure type solid solution 5elds have been carefully reinvestigated via electron and X-ray powder di4raction to search for evidence of Ni/vacancy ordering and superstructure phases. In the case of telluride, evidence is thereby found for a Ni 3 Te 4 superstructure phase attempting to condense out at x&0.5 while, in the case of selenide, three quite distinct phases have been identi5ed within the Ni 1؉x Se 2 solid solution 5eld. An intriguing characteristic honeycomb di4use-intensity distribution has also been observed across the solid solution 5eld in the case of the Ni 1؉x Te 2 system. Its presence has been attributed to low frequency phonon modes along certain very speci5c directions of reciprocal space. 2001 Academic Press

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