Phase transitions and their co-existence in TlGaSe2-TlCrS 2(Se2) systems

Abstract

Investigation of dielectric properties of layered compound, TlGaSe 2, showed that it is a ferroelectric (Tc = 105.5 K) with an intermediate incommensurate phase (Ti = 114.5 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 TC = 90 K, TpC = 115 K, μeff = 3.26 μB and TC = 105 K, TpC = 120 K, μeff = 3.05 μB, respectively. Using the method of DTA, areas of homogeneous and heterogeneous coexistence of ferroelectric and ferromagnetic phase transitions in the systems, TlGaSe2-TlCrS2 and TlGaSe2-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. © Indian Academy of Sciences.