دورية
Calzirtite after Tetragonal ZrO2Studied by Transmission Electron Microscope
| العنوان: | Calzirtite after Tetragonal ZrO2Studied by Transmission Electron Microscope |
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| المؤلفون: | Lin, Jing-Shi, Shen, Pouyan |
| المصدر: | Journal of Solid State Chemistry; November 1996, Vol. 126 Issue: 2 p177-183, 7p |
| مستخلص: | Reactive sintering of CaO, ZrO2, and TiO2(2:5:2 in molar ratio) powders at 1320°C for 2 weeks caused the topotaxial formation of calzirtite (Ca2Zr5Ti2O16, a 3 × 3 × 2 fluorite superstructure denoted as czt) after ZrO2nuclei, presumably of tetragonal (t-) symmetry with an orientational relationship [100]t//[100]czt; [001]t//[001]czt. To maintain a t-ZrO2precursor for the subsequent calzirtite formation, it was essential to have Ti4+dissolved faster than Ca2+in the ZrO2lattice. The calzirtite grains thus formed have no twin variants but have ordered domains and a new supercell which can be indexed as an 6 × 3 × 4 array of the fluorite subcell, due to ordering of two closely spacedM(1) positions (0.93Ti + 0.07Zr, determined by Rossell). The 6 × 3 × 4 supercell appeared as disk-like variants in the calzirtite matrix. |
| قاعدة البيانات: | Supplemental Index |
Full Text Finder | تدمد: | 00224596 1095726X |
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| DOI: | 10.1006/jssc.1996.0326 |