Mitsui Minings & Melting Co., Ltd.

Yukio Nobe

Yasuhide Yamaguchi

Akiko Sugimoto

In a method for manufacturing forsterite single crystals containing tetravalent chromium as luminescent ions, the method which comprises the use of chromium dioxide or comprises the use of a sintered body obtained either by sintering in a non-reducing atmosphere chromium trioxide or a mixture of at least 30 wt. % of chromium trioxide with up to 70 wt. % of dichromium trioxide, together with other oxide materials for forsterite, or by firing in an oxidizing atmosphere a mixture of more than 70 wt. % of dichromium trioxide with less than 30 wt. % of chromium trioxide, together with other oxide materials for forsterite. This invention also relates to forsterite single crystals obtained by each of the above methods.

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Ageo, Japan

Yukio Nobe