Time-differential perturbed-angular-correlation study of theIn2Se3

Abstract

The time-differential perturbed-angular-correlation technique has been used to investigate the temperature dependence of the electric-field gradient (EFG) at Cd impurities in the semiconducting compound In2Se3. Between room temperature and the melting point, four different phases could be observed. Most crystal structures which have been proposed for the a and P phases are shown to be incorrect. The P' phase (550 -720'C) has not been reported previously. The data suggest that the P phase may be a Peierls distortion of the P' phase. The EFG in the a phase is well described by a simple point-charge model suggesting that the electronic part of the EFG in a-In&Se3 is small.

Redetermination of the Crystal Structure of γ-In2Se3by Twin Crystal X-Ray Method

“…tetrahedrally coordinated In 3ϩ ions and those in a trigonal bipyramidal coordination. These results, however, were only qualitatively considered to be confirmed (9). Thus, it was concluded from the densities of the polymorphs under discussion that the coordination of the In 3ϩ ions is equal for Ͱand ͱ-In 2 Se 3 but larger than in the case of the Ͳ modification (5).…”