TEM study of a special grain boundary in a synthetic K-feldspar bicrystal: Manebach Twin |
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| Authors: | S Heinemann R Wirth G Dresen |
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| Institution: | (1) GeoForschungsZentrum Potsdam, Telegrafenberg D426, 14473 Potsdam, Germany Tel.: + 49-(0)331–288 1323 Fax: + 49-(0)331–288 1328 e-mail: stefan.heinemann@gfz-potsdam.de, DE |
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| Abstract: | A monoclinic KAlSi3O8 feldspar Manebach twin boundary was synthesized by diffusion bonding and examined using high-resolution transmission electron
microscopy. The sharp (001) twin boundary is straight and free of strain. The boundary width is smaller than d001. There is no rigid body shift observed at the twin boundary, and the feldspar structure is arranged symmetrically across
(001). The twin boundary structure consists of bridged tetrahedral crankshafts, which are characteristic of the feldspar lattice.
The grain boundary structure is in good agreement with the geometrical model of Taylor et al. (1934). The grain boundary composition
of K1/2H1/2AlSi3O8 differs from their model.
Received: 13 February 2002 / Accepted: 24 December 2002
Acknowledgements We thank M. Rühle, S. Hutt, J. Mayer, A. Strecker and U. Salzberger at MPI, Stuttgart, for their support and valuable advice
in preparing TEM sections of bicrystals. |
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| Keywords: | Grain boundary structure K-feldspar Twins Diffusion bonding |
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