Long-range order of the CuPt type has been observed in the I-III-VI2 material CuInSe2. The ordering was observed by transmission electron diffraction and by high resolution transmission electron microscopy. Comparison with simulated images confirms the CuPt-type ordering and shows the high degree of ordering. Extrinsic stacking faults were found near domain boundaries of the CuPt-type ordered material. During irradiation with the electron beam, the transformation from CuPt ordered to the sphalerite or chalcopyrite phase of CuInSe2 was observed.
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M. Bode (1994) studied this question.