Title: Process for decolorizing zinc tungstate monocrystals by heat treatment
Application Number: 85104093 Application Date: 1985.05.29
Publication Number: 1005311 Publication Date: 1986.11.26
Approval Pub. Date: Granted Pub. Date: 1989.07.05
International Classifi-cation: C30B29/32,C30B33/00
Applicant(s) Name: Beijing Polytechnical Univ. Address:
Inventor(s) Name: Liu Guoqing, Wang Liangyin, Zhang Jincun
Attorney & Agent: LOU GENJI
Abstract:
     This invention discloses a heat treatment process for perfect decolorization in appearance of zinc tungstate monocrystals. It the time of heat treatment under atmospheric conditions electric field is to be applied along the C-direction ([001]-direction). This field is generated by 200-300 volts DC. The furnace is heated at this time to 1100-1200 deg.C. and the time of heating depends upon the thickness of crystals. Completely decolorized monocrystals of zinc tungstate is thus obtained, whose properties, according to determinations are superior to those of the monocrystals obtained by usual heat treatment methods.
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