The field of solid solutions in ternary system of synthetic apatite-type alkaline earth element-yttrium-silicate oxybritholite phases of the composition: AEE_δY_10−δ[SiO₄]₆O_3−0.5δ, where AEE=Ca, Sr and Ba

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• 作者：Petr Ptá ; ček ; ^{ptacek@fch.vutbr.cz" class="auth_mail" title="E-mail the corresponding author} ; Tomá ; &scaron ; Opravil¹ ; ^{opravil@fch.vutbr.cz" class="auth_mail" title="E-mail the corresponding author} ; Franti&scaron ; ek &Scaron ; oukal² ; ^{soukal@fch.vutbr.cz" class="auth_mail" title="E-mail the corresponding author} ; Jakub Tkacz³ ; ^{tkacz@fch.vutbr.cz" class="auth_mail" title="E-mail the corresponding author} ; Jiří ; Má ; silko⁴ ; ^{masilko@fch.vutbr.cz" class="auth_mail" title="E-mail the corresponding author} ; Eva Bartoní ; čková ; ⁵ ; ^{bartonickova@fch.vutbr.cz" class="auth_mail" title="E-mail the corresponding author}
• 关键词：D. Apatite ; Oxybritholite ; Yttrium silicates ; Solid solution ; Sinter-crystallization
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：42
• 期：5
• 页码：6154-6167
• 全文大小：7428 K

文摘

This contribution deals with the synthesis, properties and investigation of the field of solid solutions formed between the three end-members of apatite-type alkaline earth element-yttrium-silicate oxybritholites with the hexagonal structure (P6₃/m). The stoichiometric composition of these compounds corresponds to the formula AEE_δY_10−δ(SiO₄)₆O_3−0.5δ, where AEE=Ca, Sr and Ba and parameter δ→2. These compounds and their solid solutions crystallize from non-equilibrium high temperature flux as the main product of sinter-crystallization process. Increasing ionic radius of AEE cations has significant effect to the lattice parameters, properties and miscibility of apatite phases. While there is non-limited miscibility of solid solutions formed between Ca₂Y₈[SiO₄]₆O₂ and Sr₂Y₈[SiO₄]₆O₂, the highest content of barium in the binary solution with these species is limited to 28% and 38%, respectively. The connecting line of these points marks out the borderline for the field of solid solutions in the ternary system. All attempts for the preparation of pure Ba₂Y₈[SiO₄]₆O₂ end-member via the ceramic method were not successful.