| 摘要 |
PURPOSE: To from particles consisting of platelike particles in which non-parallel twin crystal particles hardly exist and the main surfaces having two sheets of nearly parallel twin crystal faces consist of the (111) face and forming these platelike particles so as to have an extremely monodispersive size distribution. CONSTITUTION: The nucleus formation of the silver chloride platelike particles consisting of >=50% chloride and having main surfaces consisting of the (111) face is executed by a stage of forming the particles, of which the surfaces having two sheets of the twin crystal faces parallel with each other consist of the (100) face, at an excess chlorine ion concn. of 1×10<-4> to 8×10<-2> mol/liter under the substantial adsence of a crystal phase control agent, then by a stage of decreasing the ration of the particles exclusive of the particles having >=2 sheets of the twin crystal faces parallel with each other by executing maturation by adding a mixture composed of the crystal phase control agent adsorbed on the (111) face or the crystal phase control agent adsorbed on the (111) face and protective collioid. The platelike particles having the main surfaces consisting of the (111) face are formed by growing these particles.
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