MIXED RARE EARTH OXIDE, MIXED RARE EARTH FLUORIDE, CERIUM-BASED ABRASIVE USING THE MATERIALS AND PRODUCTION PROCESSES THEREOF

摘要

The present invention provides a mixed rare earth oxide for the production of a cerium-based abrasive, in which the ignition loss after heating at a temperature of 1,000(C for 1 hour is 0.5 mass% or less on the dry mass basis and the crystallite diameter is from 200 to 400 A; a mixed rare earth fluoride for the production of a cerium-based abrasive, in which the ignition loss is from 3 to 15% on the dry mass basis; a process for producing a cerium-based abrasive from these mixed rare earth oxide or mixed rare earth fluoride; and a cerium-based abrasive produced by using these mixed rare earth oxide or mixed rare earth fluoride.