title: High pressure orthorhombic structure of CuInSe2.
abstract: The structural behaviour of CuInSe(2) under high pressure has been studied up to 53 GPa using angle-dispersive x-ray powder diffraction techniques. The previously reported structural phase transition from its ambient pressure tetragonal structure to a high pressure phase with a NaCl-like cubic structure at 7.6 GPa has been confirmed. On further compression, another structural phase transition is observed at 39 GPa. A full structural study of this high pressure phase has been carried out and the high pressure structure has been identified as orthorhombic with space group Cmcm and lattice parameters a = 4.867(8) Å, b = 5.023(8) Å and c = 4.980(3) Å at 53.2(2) GPa. This phase transition behaviour is similar to those of analogous binary and trinary semiconductors, where the orthorhombic Cmcm structure can also be viewed as a distortion of the cubic NaCl-type structure.
authors.affiliation: Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand. thiti.b@chula.ac.th
authors.forename: T
authors.initials: T
authors.lastname: Bovornratanaraks
authors.forename: V
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authors.lastname: Saengsuwan
authors.forename: K
authors.initials: K
authors.lastname: Yoodee
authors.forename: M I
authors.initials: MI
authors.lastname: McMahon
authors.forename: C
authors.initials: C
authors.lastname: Hejny
authors.forename: D
authors.initials: D
authors.lastname: Ruffolo