METHOD FOR SYNTHESIS OF DIAMOND SIGNAL CRYSTAL

PURPOSE:To provide a new method for synthesis of a colorless and transparent diamond single crystal which can be used for decorative applications and optical parts. CONSTITUTION:In synthesizing a diamond single crystal by means of temp. difference, one or two or more metals selected from Al, Ti, Zr or Hf as a nitrogen getter 3 are positioned on the solvent metal side and Sn 4 is positioned on the seed crystal side between the solvent metal and the seed crystal 5 positioned on a cell and synthesis of the diamond is started in such a way that the nitrogen getter 3 is not brought into contact with the seed crystal 5. As it is possible thereby to synthesize inexpensively and stably a IIa-type diamond crystal being colorless and transparent, with very few inclusions and with good quality, this method is a favorable method for preparation of a synthetic diamond which can be provided for decorative applications and optical parts.