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|Title:||Effects of diffusion of Co/Ni cations of sol-gel derived ZrO2 polymorphic transformations|
|Authors:||Zeng, H.C. |
|Source:||Zeng, H.C.,Qian, M. (1996). Effects of diffusion of Co/Ni cations of sol-gel derived ZrO2 polymorphic transformations. Materials Research Society Symposium - Proceedings 398 : 655-660. ScholarBank@NUS Repository.|
|Abstract:||Transition metal incorporated ZrO2 gel matrices have been prepared by impregnation method and investigated with FTIR/DTA/XRD. The metastable tetragonal - monoclinic - tetragonal - cubic phase transformations are revealed in the DTA heating process up to 1400°C for the studied gels. High-temperature tetragonal to monoclinic transition is also observed in the cooling process. It is found that the diffusing metal cations stabilize the low-temperature tetragonal phase. However, for high-temperature (900°C) calcined gels, both as-prepared and metal-stabilized tetragonal phases are reduced substantially. Correlations between metal diffusion and gel polymorphic stabilities are also demonstrated.|
|Source Title:||Materials Research Society Symposium - Proceedings|
|Appears in Collections:||Staff Publications|
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