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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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关于氧化物固溶体相变消除问题
, PP. 578-582
Abstract:
运用热力学研究了氧化物固溶体相变消除问题。回顾近50年ZrO_2及SiO_2相变消失原因,其中对ZrO_2相变消失是由于固溶体的形成一节各家意见分歧甚大。推导了热力学公式以求固溶体相变消除的条件。这一公式为x_h(G_l~0—G_h~0)>(ΔG_(mh)-ΔG_(ml)或x_h(G_h~0-G_l~0)>(ΔG_(ml)-ΔG_(mh))式中x_h为高温型固溶体内溶剂mol％G_l~0为纯高温型溶剂在标准状态下自由能G_h~0为纯低温型溶剂在标准状态下自由能ΔG_(mh)为高温型同溶体生成时的混合自由能ΔG_(ml)为低温型固溶体生成时的混合自由能只有当G_l~0与G_h~0差额很大时,这一差额才可大于ΔG_(ml)与ΔG_(mh)的差额,从而使ΔG>0相变消失。但是由于高温型、低温型氧化物的化学键与配位数相同,它们的G_l~0与G_h~0差额很小,生成固溶体时,相变不能消除。
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