A new hydrous phase δ-Al00H synthesized at 21 GPa and 1000 °C

A. Suzuki, Eiji Otani, T. Kamada

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92 Citations (Scopus)


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) Å, b = 4.2241(1) Å, c = 2.83252(8) Å, V = 56.395 (5) Å3, 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) Å, b = 4.215(1) Å, c = 2.839(1) Å, and V = 56.37(1) Å3.

Original languageEnglish
Pages (from-to)689-693
Number of pages5
JournalPhysics and Chemistry of Minerals
Issue number10
Publication statusPublished - 2000


  • Aluminum oxide hydroxide
  • High-pressure
  • Hydrous mineral
  • Transition zone

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology


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