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| ON THE ELIMINATION OF POLYMORPHISM OF OXIDE SOLID SOLUTIONS |
| by Yu Guocheng (Luoyang Institute of Refractory Research) |
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Cite this article:
by Yu Guocheng (Luoyang Institute of Refractory Research). ON THE ELIMINATION OF POLYMORPHISM OF OXIDE SOLID SOLUTIONS. Acta Metall Sin, 1981, 17(5): 578-582.
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Abstract A thermodynamical study was made of the problem concerning elimination of polymorphism of oxide solid solutions. The understandings on the elimination of polymorphism of ZrO_2 or SiO_2 given by various authors in recent five decades were reviewed, and yet these were contradictory. Derivation on elimination of polymorphism has been performed as:x_h(G_l~0—G_h~0)>(ΔG_(mh)—ΔG_(ml)) where x_h—-the tool % of solvent in high temperature modification of the solid solution, G_l~0 or G_h~0—the free energy of solvent under standard conditions for lower or higher temperature modification respectively and ΔG_(mh) or ΔG_(ml)—the free energy of mixing of the solid solution for higher or lower temperature modification respectively. It is only possibilty of the elimination of polymorphism that the differnce between G_l~0 and G_h~0 is much greater than that of ΔG_(mh) and ΔG_(ml). Due to the identity of the chemical bonds or coordination numbers between high and low temperature modifications of oxides, these differences are very small, thus, the polymorphism of oxide solid solutions which is possesed of polymorphism originally will be not eliminated.
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Received: 18 May 1981
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[19]#12m |
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