Structural determination of high-pressure AlPO<sub>4</sub> phases by NMR and powder X-ray diffraction techniques
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- Kanzaki Masami
- ISEI, Okayama Uni.
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- Xue Xianyu
- ISEI, Okayama Uni.
Bibliographic Information
- Other Title
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- NMRと粉末X線回折法によるAlPO<sub>4</sub>高圧相の構造解析
Description
High-pressure quench experiments of AlPO4 revealed two new polymorphs at 6-7 GPa. "I" stabilized at 1000°C, and "II" stabilized at 1500°C. 31P MAS NMR revealed three tetrahedral P sites of equal abundances in each phase. 27Al MQ MAS NMR unveiled two octahedral and one penta-coordinated Al sites for each phase. We solved the crystal structures using the "FOX" program (direct-space searching method), using the information from NMR to constrain the number and types of polyhedra. The space group of I was P-1, whereas, that of II was P21/c. The length of a- and c-axes are similar, however, that of b-axis of II was about twice of that of I. The densities of two phases are almost the same, and are 28% larger than that of quartz phase. Both phases contain short chains made of edge-shared six Al-polyhedra which are interconnected by PO4 tetrahedra to form 3D network.
Journal
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- Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
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Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2009 (0), 127-127, 2009
Japan Association of Mineralogical Sciences
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Keywords
Details 詳細情報について
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- CRID
- 1390001205545362816
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- NII Article ID
- 130004601288
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- Text Lang
- ja
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- Data Source
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- JaLC
- CiNii Articles
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- Abstract License Flag
- Disallowed