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Phase transformations of polymeric CdI2-type IrTe2 under high pressure

✍ Scribed by J.M. Léger; A.S. Pereira; J. Haines; S. Jobic; R. Brec

Book ID
104152134
Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
189 KB
Volume
61
Category
Article
ISSN
0022-3697

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✦ Synopsis

The high-pressure behavior of IrTe 2 has been studied up to 32 GPa in a diamond anvil cell by angle-dispersive X-ray diffraction at room temperature. The CdI 2 -type structure was present over the whole pressure range investigated. At about 5 GPa, a new monoclinic phase appeared; however, the transformation remained incomplete. At 20 GPa, new and faint diffraction lines were detected; after laser heating at this pressure, these lines increased strongly in intensity and were easily assigned to a cubic unit cell. This phase was retained down to ambient conditions. Its structure was refined by Rietveld analysis. It is pyritelike with Te-Te pairs. Under ambient conditions, the intrapair Te-Te distance is 3.075 A ˚, which is much shorter than the shortest Te-Te distance in the CdI 2 -type phase; this distance did not decrease appreciably with pressure in contrast to interpair distances.

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