A new hydrous phase δ-AlOOH synthesized at 21 GPa and 1000 °C

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書誌事項

公開日
2000-12-14
権利情報
  • http://www.springer.com/tdm
DOI
  • 10.1007/s002690000120
公開者
Springer Science and Business Media LLC

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説明

A new phase of AlOOH (tentatively called δ-AlOOH) was synthesized at 21 GPa and 1000 °C and its crystal structure was identified by a powder X-ray diffraction method. Rietveld refinement revealed that this aluminum oxide hydroxide has an orthorhombic unit cell, a = 4.7134(1) A, b = 4.2241(1) A, c = 2.83252(8) A, V = 56.395 (5) A3, and Z = 2 in the space group of P21 nm. A calculated density is 3.533 g cm−3, which is about 4.48 and 15.04% denser than that of diaspore and boehmite, respectively. The δ-[Al0.86Mg0.07Si0.07]OOH is also stable at 21 GPa and 1000 °C, coexisting with majorite and phase egg, and its cell parameters are a = 4.710(1) A, b = 4.215(1) A, c = 2.839(1) A, and V = 56.37(1) A3.

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