Subsolidus Phase Relations of the CaO-WO3-CuO System at 800 °C in Air

The subsolidus phase relations of the CaO-WO3-CuO system were investigated in air. The samples were equilibrated at 800 degrees C. Under these conditions, five binary oxide phases are stable: Ca2CuO3, Cu3WO6, CuWO4, CaWO4 and Ca3WO6. The pseudo-ternary section is characterised by 6 three-phase regions. No Ca equivalents to the Sr2CuWO6, Ba2CuWO6 or Sr8CuW3O18 phases were formed