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 = 105·5 K) with an intermediate incommensurate phase (T i = 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 T C = 90 K, T \(_{C}^{p}\) = 115 K, μ eff = 3·26 μ B and T C = 105 K, T \(_{C}^{p}\) = 120 K, μ eff = 3·05 μ 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.