Patent ID: 6248465
Filing Date: 2001-06-19
Classification: C04B,H01M,Y02E

Abstract:
A complex oxide ceramic sintered body having a perovskite crystal structure and represented by the formula (La.sub.1-x Sr.sub.x).sub.a (Cr.sub.1-y-z Al.sub.y Co.sub.z).sub.b O.sub.3wherein x+z.gtoreq.0.06; z.gtoreq.0.02; x+y+3z.ltoreq.0.25; 2x+3y+5z.gtoreq.0.40; x+y.gtoreq.0.12; and 1.00.ltoreq.b/a.ltoreq.1.04; andwherein the sintered body hasa relative density of about 94% or more;a bending strength of about 15 kgf/mm.sup.2 or more at room temperature both before and after being exposed for 24 hours to an atmosphere of humidified hydrogen having an oxygen partial pressure of 10.sup.-18 atm at 1,000.degree. C.;a coefficient of lattice volumetric expansion of 0.3% or less at room temperature after being exposed for 24 hours in an atmosphere of humidified hydrogen having an oxygen partial pressure of 10.sup.-18 atm at 1,000.degree. C.;an average thermal expansion coefficient at 30 to 1,000.degree. C. in the range of about 9.8 to 11.0.times.10.sup.-6 K.sup.-1 ; anda phase transition temperature from a rhombic system to a rhombohedral system of about -20.degree. C. or less.