Patent ID: 6464953
Filing Date: 2002-10-15
Classification: B01D,B01J,C01B,C01F,C01G,C01P,C04B,G01N,H01M,Y02E,Y02P

Abstract:
A process for the preparation of a sintered compound having grain boundaries, of formula: LaMO3, M being aluminum, gallium or indium and wherein the lanthanum is partially substituted with an alkali metal, an alkaline-earth metal or a rare earth and the element M is partially substituted with an alkaline-earth metal or zinc, wherein said compound is substantially free of any electrically active secondary phase at the grain boundaries, and is obtained by pressureless sintering, said process comprising the steps of:a) forming a mixture of salts of lanthanum and of the element M and of salts of the substituents for the element M and for the lanthanum in a liquid medium, b) spray-drying said mixture to obtain a product, and c) calcining the product obtained in step b).