The Vertical Bridgman method ( VB )and the Vertlcal Gradient Freeze method ( VGF ) are superbr to the Gzochralski method ( CZ )from the standpoint of 【hermal environment due to the f{)rmer being ] ow temperature gra ・ dient. In spite of this technolegical merit , appiica 巨ons of VB and VGF have been few. The reason why VB and VGF have not been popular is that these growing techni − ques had to wait fc ) r suitable advances in chemica1 , the crucible , atomosphere and raw material used . In this

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... pape ら first we consider the technological merits and pro ・ blems facing the VB and VGF methods at this time , Next we prcsent a power 堀 soiutiomo these problems , namely Reactlve gas Atomosphere Proccssing me [hod ( RAP ) which 三 s applied to the puri 丘cation process of metallic halide materials , The application σ f RAP to halide materials resuhs the non − sticklng conditien between the crystal and the crucible . This idea of RAP is also ap − plicable to metals , semiconductors and oxides , This new devebpment will substantially improvc VB and VGF rnethods .