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Transmission electron microscopy of SrAl2Si2O8: Feldspar and hexacelsian polymorphs

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Abstract

Sr-feldspar: The electron diffraction data obtained agree with the space group 12/c determined by X-ray methods. The antiphase domains present are considered to originate from a subsolidus phase transition due to ordering of Al and Si. Polysynthetic twins of the Carlsbad law have been found. Sr-hexacelsian: Three polymorphs with the probable space groups P6/mmm, P63/mcm and Immm have been observed, the latter two for the first time in this compound. Both P6/mmm and P63/mcm polymorphs were present at room temperature. When heated above ∼600° C, the P63/mcm polymorph transforms rapidly and reversibly to the pseudohexagonal orthorhombic phase with the space group Immm. P63/mcm-Sr-hexacelsian shows antiphase domains with the displacement vector 1/2c and Immm-Sr-hexacelsian contains twin domains with the three-fold twin axis parallel to c. The occurrence of antiphase and twin domains, respectively, agrees with the symmetry reductions involved with the phase transitions. This is shown by aid of the group—subgroup relationships among the space groups P6/mmm, P63/mcm and Immm.

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Authors and Affiliations

  1. Institut für Kristallographie und Mineralogie, Johann Wolfgang Goethe-Universität, D-6000, Frankfurt/M., Germany

    Jutta Töpel-Schadt

  2. Fachbereich 11, Mineralogie, Technische Hochschule Darmstadt, D-6100, Darmstadt, Germany

    W. F. Müller

  3. Institut für Mineralogie, Westf. Wilhelms-Universität, D-4400, Münster/Westf., Germany

    H. Pentinghaus

Authors
  1. Jutta Töpel-Schadt
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  2. W. F. Müller
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  3. H. Pentinghaus
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Töpel-Schadt, J., Müller, W.F. & Pentinghaus, H. Transmission electron microscopy of SrAl2Si2O8: Feldspar and hexacelsian polymorphs. J Mater Sci 13, 1809–1816 (1978). https://doi.org/10.1007/BF00548745

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