Phase Diagram of (CuInSe2)1−x(FeSe)x alloys

• Published in: Journal of alloys and compounds Vol. 630; pp. 146 - 150
• Main Authors: Grima-Gallardo, P., Torres, S., Quintero, M., Nieves, L., Moreno, E., Delgado, G.E.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.05.2015
• Subjects: Alloys; CuInSe2; Differential thermal analysis; FeSe; Phase diagram; X-ray diffraction; FeSe; X-ray diffraction; CuInSe2; Differential thermal analysis; Phase diagram; Alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2015.01.015

•CuInSe2/FeSe alloys have been prepared by the melt and anneal technique.•The alloys were characterized by X-ray diffraction and differential thermal analysis.•From the experimental results a T–x phase diagram was proposed. Polycrystalline samples of the (CuInSe2)1−x(FeSe)x alloy system in the composition range 0⩽x⩽1 were prepared by the melt and anneal technique. X-ray Diffraction (XRD) and Differential Thermal Analysis (DTA) techniques were used to characterize the products. From the analysis of the experimental results a T–x phase diagram was proposed. It was found that at 600K, two single phase fields (chalcopyrite and a semi-ordered phase in space group P4¯2c) were separated by a relative narrow two phase field in the composition range 0<x<0.4. For higher values of x, a secondary phase identified as γ-Fe7Se8 coexist with the semi-ordered phase for 0.4<x<0.7 and with a stannite phase for 0.7<x<0.95. The variation with composition of the order–disorder phase transition was well described by an extension of Van Vechten theory.