Heat-resisting phosphate based compound sintered bodies and production thereof

摘要

Heat-resisting phosphate based compound sintered bodies are disclosed, which each contain not less than 10% by weight of a crystalline phase of RZr4(PO4)6 in which R is an element in Group IIa of the Periodic Table. A weight-reduced percentage of the sintered body when being thermally treated at 1,400 DEG C. for 100 hours is not more than 10%. A process for producing such phosphate based compound sintered bodies is also disclosed.