Phase Transition of Alkali Metal Cation-TCNQ Anion Radical Simple Salts

Abstract

The phase transition at 1 bar has been observed in alkali metal cation-TCNQ anion radical simple salts by means of measurements of the electrical resistivity of their single crystals. The temperature dependence of the resistivity under high hydrostatic pressures has been studied in order to investigate the effect of the pressure on this phase transition. The nature of this phase transition has been discussed. The pressure-induced new phase has also been found in these TCNQ salts at room temperature; thus, more than three phases (α, β, γ···) are considered to exist in the solid phase of these TCNQ, salts.