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Pure forsterite bicrystals were produced by direct bonding of highly polished single crystal plates. We fabricated a series of synthetic grain boundaries with tilt axis a and tilt angles ranging from 9.9 to 21.5°. Transmission Electron Microscope (TEM) investigations show low-angle grain boundaries with arrays of c-dislocations for all misorientations with tilt angles up to 21.5°. Low-angle grain boundary structures were fully developed at annealing temperatures <400°C and no structural changes were observed in the grain boundary region after further annealing at 1650°C. 相似文献
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Synthesis of feldspar bicrystals by direct bonding 总被引:1,自引:0,他引:1
We have produced synthetic feldspar bicrystals using a direct bonding technique. A gem-quality orthoclase crystal from Itrongay,
Madagascar, was used for the bonding experiments. Microprobe analysis shows only minor concentrations of iron and sodium.
Orthoclase single crystal plates oriented parallel (0 0 1) were cut and chemomechanically polished with silica slurry. From
interferometry, final roughness of the square crystal plates was about 0.34 nm. Specimens were wet-chemically cleaned using
deionised water. The bonding procedure produced an orthoclase bicrystal with an optically straight grain boundary-oriented
parallel (0 0 1), which was investigated by HREM. Along the interface no amorphous layer was observed between lattice fringes
of both crystals. We suggest that the bicrystals formed by initial hydrogen bonding and subsequent water loss and polymerisation
of silanol and aluminol groups at elevated temperatures.
Received: 19 February 2001 / Accepted: 16 May 2001 相似文献
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