Polymorphic Transformations and Thermal Expansion of Some Modifications in Ag1.5Cu0.5Se and Ag0.4Cu1.6Se#

Alıyev , Yusif; Asadov, Y.G.; Dashdemirov, A.O.; Aliyeva, R.D.; NAĞIYEV, TURAL; Jabarov, S.H.

doi:10.1142/9789819818433_0022

Polymorphic Transformations and Thermal Expansion of Some Modifications in Ag1.5Cu0.5Se and Ag0.4Cu1.6Se#

Alıyev Y., Asadov Y., Dashdemirov A., Aliyeva R., NAĞIYEV T., Jabarov S.

in: Materials, Manufacturing Processes and Devices, World Scientific Publishing , pp.191-200, 2025

Publication Type: Book Chapter / Chapter Research Book
Publication Date: 2025
Doi Number: 10.1142/9789819818433_0022
Publisher: World Scientific Publishing
Page Numbers: pp.191-200
Azerbaijan State University of Economics (UNEC) Affiliated: Yes

Abstract

The Ag1.5Cu0.5Se and Ag0.4Cu1.6Se compounds have been synthesized and grown as single crystals. High-temperature X-ray diffraction method was used to study polymorphic transformations. It is shown that the Ag1.5Cu0.5Se crystals of high-temperature FCC modification are decomposed into Ag2Se and AgCuSe when the temperature decreases below T = 488 K and Ag0.4Cu1.6Se is decomposed into Cu2Se and AgCuSe when the temperature decreases below T = 540 K. Transformations in both compounds are reversible. Crystalline parameters are obtained and the temperature dependence of the lattice parameters for each phase is built.