The lanthanide sulfides exhibit optical, magnetic and thermophysical properties that make them attractive as material components in thermoelectric, solar photovoltaic, and sensor/detector devices. In this dissertation, a general and practical route to prepare lanthanide sulfides was explored via thermolysis of compound of lanthanide and dithiocarbamate compared with traditional synthesis methods. Heats in the preparation processes were detailedly measured in view of energy, which would elucidate the thermod...