CERIUM BASED ABRASIVE MATERIAL, RAW MATERIAL THEREOF AND METHOD FOR THEIR PREPARATION

The present invention provides a stock material for cerium-based abrasives which can be sintered at a relatively low roasting temperature without causing abnormal growth of the particles. More concretely, the stock material for cerium-based abrasives is produced by calcinating the carbonate of rare earth at a given temperature level to partly convert it into the oxide of rare earth in such a way to produce the mixed stock material having a loss on ignition of 0.5 to 25% on a dry basis, determined by heating at 1000 DEG C for 1 hour.