Characteristics of K2TiCl6 Synthesis from KCl and TiCl4.

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  • ＫＣｌとＴｉＣｌ４からのＫ２ＴｉＣｌ６の合成反応特性
  • KCI ト TIC14 カラ ノ K2TIC16 ノ ゴウセイ ハンノウ トク

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Abstract

Reaction characteristics were examined for synthesis of K2TiCl6 from KCl particles and TiCl4 gas. The reaction experiments were carried out exposing different sizes of KCl particles to a TiCl4 gas stream at 683 K. The mass gain due to formation of K2TiCl6 was measured as a function of time and morphology of the product was observed by SEM and EPMA. The apparent reaction rate decreases rapidly with the progress of the reaction, and the reaction is virtually terminated before its completion EPMA analysis on the particle cross-section reveals that the products are distributed around an unreacted KCl core within the particle, and the termination of the reaction takes place when the thickness of the outer product layer grows up to about 6 μm. The reaction kinetics are explained well on the basis of an unreacted-core model which assumes that the rate determining step is the intra-particle TiCl4 gas diffusion.

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