Anisotropic microhardness in single-crystal and polycrystalline BaTiO3

The room-temperature hardness of single-crystal and dense polycrystalline BaTiO3 was investigated by microindentation. The longer diagonal of the Knoop indenter was oriented either parallel or perpendicular to the poled axis of the material. The hardness of the unpoled sample was isotropic. However,...

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Bibliographic Details
Published in:Journal of materials science 1998-02, Vol.33 (3), p.669-673
Main Authors: PARK, E. T, ROUTBORT, J. L, LI, Z, NASH, P
Format: Article
Language:English
Subjects:
Anisotropy
Barium titanates
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Hardness
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Microhardness
Physics
Piezoelectricity
Polycrystals
Residual stress
Single crystals
Tribology and hardness
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Summary:The room-temperature hardness of single-crystal and dense polycrystalline BaTiO3 was investigated by microindentation. The longer diagonal of the Knoop indenter was oriented either parallel or perpendicular to the poled axis of the material. The hardness of the unpoled sample was isotropic. However, hardnesses in the poled samples were anisotropic, with the highest hardnesses resulting when the longer diagonal was parallel to the poled axis. The hardness anisotropy may be due primarily to residual stresses caused by the piezoelectric coupling effect.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1004329526403