Abstract
Cu3BiS3 has been synthesized to clarify the thermal nature related to the ionic conduction. Heating and cooling measurements by the DSC showed reversible nature as a whole, except for a little hysteresis on temperature of the first order transition around 100–110°C. Resistivity decreased steeply from room temperature to about 77–90°C, above which the material showed good ionic conductivity. In cooling process, however, the resistivity did not recover the original value until room temperature. Several days are necessary to get back the initial resistivity at room temperature. The irreversible nature on conductivity will be explained by the existence, at least partially, of the metastable and electrolytic state on cooling to the room temperature. The reversible profiles in DSC and TMDSC indicates that the first order transition has essentially little or no effect to the conversion to the solid electrolyte. Temperature modulated DSC data were correlated well to heat capacity profiles obtained so far from the adiabatic calorimety and DSC-data.
