Mechanical properties of single crystalline and glassy lithium triborate

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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 ∼ 1 - 8 GPa, H M∼ 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.


Original languageEnglish
Pages (from-to)339-349
Number of pages11
JournalCrystal Research and Technology
Issue number4
Publication statusPublished - Apr 2008



  • B-O rings, Cleavage, Hardness