SYNTHETIC QUARTZ GLASS SUBSTRATE POLISHING AGENT, PRODUCTION METHOD THEREFOR, AND SYNTHETIC QUARTZ

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The present invention provides a synthetic quartz glass substrate polishing agent comprising polishing particles and water, and is characterized in that the polishing particles comprise silica particles as base particles, on the surface of which are supported particles of a composite oxide of cerium and at least one rare-earth element selected from among trivalent rare-earth elements excluding cerium. The synthetic quartz glass substrate polishing agent has a high polishing rate and is capable of reducing the occurrence of polishing defects to a sufficient degree.