T. BovornratanaraksV. SaengsuwanK. YoodeeM. I. McMahonC. HejnyD. RuffoloChulalongkorn UniversitySouth Carolina Commission on Higher EducationUniversity of EdinburghMahidol University2018-09-242018-09-242010-09-08Journal of Physics Condensed Matter. Vol.22, No.35 (2010)1361648X095389842-s2.0-77957001151https://repository.li.mahidol.ac.th/handle/20.500.14594/29298The structural behaviour of CuInSe2 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 orthorhombie 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 orthorhombie Cmcm structure can also be viewed as a distortion of the cubic NaCl-type structure. © 2010IOP Publishing Ltd.Mahidol UniversityMaterials SciencePhysics and AstronomyArticleSCOPUS10.1088/0953-8984/22/35/355801