Inorganic Solid Phases

η-alumina (Al2.67O4 m-γ cub) Crystal Structure

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General Information

  • Phase Label(s): Al2.67O4 m-γ cub
  • Structure Class(es): spinel family
  • Classification by Properties: –
  • Mineral Name(s): –
  • Pearson Symbol: cF56
  • Space Group: 227
  • Phase Prototype: Fe3O4
  • Measurement Detail(s): automatic diffractometer (determination of cell parameters), automatic diffractometer; U.S.A. Maryland, Gaithersburg, NIST Center for Neutron Research, NBSR (determination of structural parameters), neutrons; λ = 0.1548 nm (determination of cell and structural parameters)
  • Phase Class(es): –
  • Compound Class(es): oxide
  • Interpretation Detail(s): complete structure determined, Rietveld refinement, RP = 0.0650; wRP = 0.0843; RB = 0.0624
  • Sample Detail(s): sample prepared from bayerite, deuterated, 1.00(5) wt.% loss due to residual hydroxyl measured by loss-on-ignition analysis; very small amounts of Al2O3 γ, powder (determination of cell and structural parameters)

Substance Summary

  • Standard Formula: Al2.67O4
  • Alphabetic Formula: Al2.67O4
  • Published Formula: η-alumina
  • Refined Formula: Al2.68O4
  • Wyckoff Sequence: 227,fe2c
  • Z Formula Units: 8
  • Density: ρ = 3.65 Mg·m−3
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Crystallographic Data

Cell Parameters

Published Data
Standardized Data
Unit Cell
Niggli-Reduced Cell
Space Group
a
b
c
α
β
γ
a/b
b/c
c/a
V

Atom Coordinates

Standardized

Site
Element
Wyckoff Symbol
Symmetry
X
Y
Z
Occupation
Co-ord. No.
Atomic Env.

Published

Site
Element
Wyckoff Symbol
Symmetry
X
Y
Z
Occupation

Displacement Parameters

Isotropic

Site
Published
B [nm2]
Type
Computed
Beq [nm2]

Powder Pattern

published defraction line
d [Å]
computed diffraction line for Cu Kα
d [nm]
intensity
I [1]
h [1]
k [1]
l [1]
Radiation
Remark

Experimental Details

Reference

3D Interactive Structure

About this content

  • Database name

    PAULING FILE Multinaries Edition – 2012

  • Dataset ID

    sd_1252292

  • Copyright

    ©Springer & Material Phases Data System (MPDS), Switzerland & National Institute for Materials Science (NIMS), Japan, 2016

  • Chief Editor

    Pierre Villars, Material Phases Data System (MPDS), CH-6354 Vitznau, Switzerland

    villars.mpds@bluewin.ch

  • Credits

    SpringerMaterials Release 2016.

    Data generated pre-2002: © Springer & MPDS & NIMS; post-2001: © Springer & MPDS

    All Rights Reserved. Version 2016.10.

    Project Coordinator: Shuichi Iwata

    Section-Editor: Karin Cenzual (Crystal Structures)

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