Patent ID: 6843975

Claim:
A method of manufacturing an oxide sintered body, comprising the steps of: covering a die with oxide ceramic, Al 2 O 3 , ZrO 2 , Si 3 N 4 , Ru, Pt, Ir, Co or Ni; and pressure sintering an oxide powder in said die at a sintering temperature of 1200° C. to 1400° C. to form an oxide sintered body having a perovskite structure represented with a chemical formula of MRuO 3 , wherein M represents at least one of Ca, Sr and Ba, and wherein a total content of alkali metals including Na, X, and Fe, Ni, Co, Cr, Cu, Al is 100 ppm or less, and a content of elements U and Th is 10 ppb or less, and wherein said oxide sintered body is has a relative density of 90% or more.