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The commensurately modulated structure of the lock-in phase of synthetic Co-åkermanite, Ca2CoSi2O7
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H. Böhm
Published/Copyright:
September 25, 2009
This paper deals with the structure determination of the lock-in phase of synthetic modulated Co-åkermanite, Ca2CoSi2O7. The structure determination of the (3 × 3 × 1) superstructure is based on X-ray data of a twinned single crystal taken at 130 K. The deformation modes in the commensurate lock-in phase are derived and compared with the deformations found by other authors in the incommensurate phase. A model for the driving force of the modulation in melilites in general is proposed: In order to release internal stress domains with clusters of 6-and 7-fold coordinated calcium are formed which are arranged in octagons.
Published Online: 2009-9-25
Published in Print: 2000-2-1
© 2015 Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München
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