Phase transitions and their co-existence in TlGaSe2-TlCrS2(Se2) systems

Abstract

Investigation of dielectric properties of layered compound, TlGaSe2, showed that it is a ferroelectric (T (c) = 105 center dot 5 K) with an intermediate incommensurate phase (T (i) = 114 center dot 5 K). Our magnetic studies of layered compounds, TlCrS2 and TlCrSe2, for the first time revealed that the magnetic phase transition in these compounds are quasi two-dimensional ferromagnetic in nature and magnetic characteristics are T (C) = 90 K, T = 115 K, mu (eff) = 3 center dot 26 mu (B) and T (C) = 105 K, T = 120 K, mu (eff) = 3 center dot 05 mu (B) , respectively. Using the method of DTA, areas of homogeneous and heterogeneous coexistence of ferroelectric and ferromagnetic phase transitions in the systems, TlGaSe2-TlCrS2 and TlGaSe (2)-TlCrSe2, were identified. The low-dimensional solid solutions and eutectic alloys in these systems can be used as basic materials for plenty of functional recorders.