PROCESS FOR SYNTHESIZING DIAMOND - SUMITOMO ELECTRIC INDUSTRIES

Title:

PROCESS FOR SYNTHESIZING DIAMOND

Document Type and Number:

WIPO Patent Application WO/1992/014542

Kind Code:

A1

Abstract:

A process for synthesizing a colorless and transparent diamond crystal which is useful as the material of ornaments and optical parts economically by the temperature difference method, characterized by using at least one metal selected from the group consisting of Fe, Co, Ni, Mn and Cr as the solvent for crystal growth, provided that it is necessary to use at least two metals when Fe is used, and using at least one metal selected from the group consisting of Al, Ti, Zr, Hf, V, Nb and Ta as the nitrogen getter for removing nitrogen present in the solvent in an amount of 0.5 to 7 wt% based on the total amount of the solvent, provided that this amount should be 2 wt% or less when Al is used alone.

Inventors:

SATOH SHUICHI (JP)
SUMIYA HITOSHI (JP)
TSUJI KAZUWO (JP)
GOUDA YASUSHI (JP)

Application Number:

PCT/JP1992/000149

Publication Date:

September 03, 1992

Filing Date:

February 14, 1992

Export Citation:

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Assignee:

SUMITOMO ELECTRIC INDUSTRIES (JP)

International Classes:

B01J3/06; (IPC1-7): B01J3/06; C01B31/06

Foreign References:

JPS374407B1
JPS378358B1
JPS389552B1	1963-06-19
JPS517639B1	1976-03-09
JPS6015564B2	1985-04-20
JPS55136114A	1980-10-23
JPS6317492B2	1988-04-14
JPS5879899A	1983-05-13
JPS59164606A	1984-09-17
JPS5523201B2	1980-06-21
JPS4830555B1	1973-09-21
JPS5511605B2	1980-03-26

Other References: