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Crystal Research and Technology |
Cryst. Res. Technol. 43, 339 (2008) - Abstract -
Mechanical properties of single crystalline and glassy lithium triborate
I. P. Shakhverdova, P. Paufler, R. S. Bubnova*, S. K. Filatov**, A. A. Levin, and D. C. Meyer
Institut für Strukturphysik, TU Dresden, 01062 Dresden, Germany
*Institute of Silicate Chemistry of the Russian Academy of Sciences, Ul. Odoevskogo, 24/2, St. Petersburg 199155, Russia
**Dept. of Crystallography, St. Petersburg State University, University Emb. 7/9, St. Petersburg 199034, Russia
| Keywords | hardness, cleavage, B-O rings |
| PACS | 61.43.Fs, 61.66.Fn, 62.20.Mk, 62.20.Fe, 62.20.Dc, 62.20.Qp |
| DOI | 10.1002/crat.200711104 |
Mechanical properties of LiB3O5 single crystal plates with different orientation as well as of glass with the same composition have been investigated. The nano- (H) and microhardness (HM), the reduced Young’s modulus (Er) and the crack behaviour of the samples were studied. Both hardness and Young’s modulus of glass appeared smaller in comparison to corresponding single crystal data (H ~ 7 – 8 GPa, HM ~ 6 GPa, Er ~ 70 – 80 GPa for glass and H ~ 10 – 15 GPa, HM ~ 6 –11 GPa, Er ~ 93 - 155 GPa for single crystal). H, Er, and the plane of crack propagation proved orientation-dependent. Cracks in the glass sample were not observed up to 0.49 N microindentation load, whereas for the single crystal the cracks appeared already at 0.098N. In single crystals the observed cleavage planes {211} and/or {412} are oriented nearly parallel to planes of B-O rings.
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