Inorganic Solid Phases

Ca2MgSi2O7 (Ca2Mg[Si2O7], p = 1.37 GPa) Crystal Structure

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General Information

  • Phase Label(s): Ca2Mg[Si2O7]
  • Structure Class(es): –
  • Classification by Properties: –
  • Mineral Name(s): akermanite
  • Pearson Symbol: tP24
  • Space Group: 113
  • Phase Prototype: Ca2Mg[Si2O7]
  • Measurement Detail(s): automatic diffractometer; 18 (determination of cell parameters), automatic diffractometer; Picker (determination of structural parameters), X-rays, Mo Kα (determination of cell and structural parameters), p = 1.37 GPa (determination of cell and structural parameters)
  • Phase Class(es): –
  • Compound Class(es): disilicate
  • Interpretation Detail(s): complete structure determined; pressure dependence studied, least-squares refinement; 215 reflections; I > 3σ(I), R = 0.035; wR = 0.043
  • Sample Detail(s): akermanite sample from synthetic, sample prepared from CaCO3, MgO, SiO2, single crystal (determination of cell parameters), single crystal, 0.05×0.10×0.11 mm3 (determination of structural parameters)

Substance Summary

  • Standard Formula: Ca2Mg[Si2O7]
  • Alphabetic Formula: Ca2Mg[Si2O7]
  • Published Formula: Ca2MgSi2O7
  • Refined Formula: Ca2MgO7Si2
  • Wyckoff Sequence: 113,fe3ca
  • Z Formula Units: 2
  • Density: ρ = 2.99 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]

Anisotropic

Site
β11 [nm2]
β22 [nm2]
β33 [nm2]
β12 [nm2]
β13 [nm2]
β23 [nm2]

Experimental Details

Reference

3D Interactive Structure

About this content

  • Database name

    PAULING FILE Multinaries Edition – 2012

  • Dataset ID

    sd_1323875

  • 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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