Physics and Chemistry of Minerals

, Volume 12, Issue 5, pp 279–282 | Cite as

Mn3+ in garnets III. Absence of Jahn-Teller distorition in synthetic Mn3+-bearing garnet

  • R. Arni
  • K. Langer
  • E. Tillmanns
Article
Received:

Abstract

The crystal structure of a ternary Mn3+-bearing garnet, close to the composition Gross34 Spess26 CaMnGt40 has been refined to a weighted R-value of 0.051 for 440 unique reflections. The lattice constant is 11.867(1) Å, fractional atomic parameters for oxygen are x=0.0374 (2), y=0.0470 (2), and z=0.6532 (2). Refinement of site occupancies gave 0.81 (3) Ca+0.19 (3) Mn2+ in the eight coordinated site 24c and 0.64 (2) Al+0.36 (2) Mn3+ in the octahedral site 16a. No deviation from the cubic space group Ia3d has been observed, the Mn3+-bearing YO6 octahedron is nearly regular. Thus, the presence of the 3d4-configurated ion Mn3+ does not cause Jahn-Teller distortion in this garnet structure.

Keywords

Oxygen Reflection Crystal Structure Mineral Resource Lattice Constant 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • R. Arni
    • 1
  • K. Langer
    • 1
  • E. Tillmanns
    • 2
  1. 1.Institut für Mineralogie und KristallographieTechnische UniversitätBerlinWest Germany
  2. 2.Institut für GeowissenschaftenUniversitätMainzWest Germany

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