PRODUCTION OF SUBSTRATE FOR VAPOR SYNTHESIS OF SINGLE CRYSTAL DIAMOND FILM

摘要

PURPOSE: To provide a method for producing a substrate for synthesizing a single crystal diamond film by which the diamond film of a single crystal can be vapor synthesized in a wide area at a low cost and the single crystal diamond substrate of a large area can be obtained to enable a remarkable improvement in characteristics of diamond and practical use thereof in a wide application field using the diamond. CONSTITUTION: A series of steps of a rolling step and an annealing step for a simple substance or an alloy material of platinum are repeated once or plural times to regulate the thickness to <=0.5mm, preferably <=0.2mm. Thereby, the (111) crystal face or a crystal face tilted at an angle within the range of ±10 deg. from the (111) crystal face is formed in all or a part of the surface of the simple substance or alloy material of the platinum. The simple substance or alloy of the platinum is heated at >=800 deg.C temperature in the annealing step.