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Mechanical properties of single crystalline and glassy lithium triborate
Author(s) -
Shakhverdova I. P.,
Paufler P.,
Bubnova R. S.,
Filatov S. K.,
Levin A. A.,
Meyer D. C.
Publication year - 2008
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200711104
Subject(s) - materials science , cleavage (geology) , single crystal , modulus , indentation hardness , crystallography , young's modulus , composite material , diffraction , crystal (programming language) , mineralogy , chemistry , microstructure , optics , fracture (geology) , programming language , physics , computer science
Abstract Mechanical properties of LiB 3 O 5 single crystal plates with different orientation as well as of glass with the same composition have been investigated. The nano‐ ( H ) and microhardness ( H M ), the reduced Young's modulus ( E r ) 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, H M ∼ 6 GPa, E r ∼ 70 – 80 GPa for glass and H ∼ 10 – 15 GPa, H M ∼ 6 –11 GPa, E r ∼ 93 – 155 GPa for single crystal). H , E r , 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. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)