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    Atomistic simulation of Mg2SiO4 and Mg2GeO4 spinels: a new model

    19441_downloaded_stream_533.pdf (338.3Kb)
    Access Status
    Open access
    Authors
    Wright, Kathleen
    Gale, Julian
    Blanchard, M.
    Date
    2005
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Wright, Kathleen and Gale, Julian and Blanchard, M. 2005. Atomistic simulation of Mg2SiO4 and Mg2GeO4 spinels: a new model. Physics and Chemistry of Minerals 32 (5-6): 332-338.
    Source Title
    Physics and Chemistry of Minerals
    DOI
    10.1007/s00269-005-0001-x
    Faculty
    Department of Applied Chemistry
    Division of Engineering, Science and Computing
    Faculty of Science
    Remarks

    The original publication is available at http://www.springerlink.com

    http://dx.doi.org/10.1007/s00269-005-0001-x

    URI
    http://hdl.handle.net/20.500.11937/20633
    Collection
    • Curtin Research Publications
    Abstract

    We have developed a new interatomic potential model for the simulation of ringwoodite, the high-pressure phase of Mg2SiO4, and its low-pressure analogue, Mg2GeO4 spinel. The main novelty is the addition of a breathing shell model that enables us to accurately describe the structural and elastic parameters of both spinels up to 15PGs. Our model has also been applied to the two other Mg2SiO4 polymorphs in order to test its transferability. We find that although it is able to reproduce the structure and physical properties of wadsleyite, the breathing shell description is less successful with forsterite. the Mott-Littleton method has been used to calculate the energy of the intrinsic point defects in both spinels. The results indicate that these phases are likely to have the same defect population with teh MgO partial Schottky defect predominating.

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