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Vickers micromechanical indentation and compression testing of ferroelectric lead hydrogen phosphate single crystals

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Abstract

Ferroelectric crystals of lead hydrogen phosphate (LHP) have been synthesized using the controlled diffusion of lead nitrate into a set gel containing orthophosphoric acid. The variation in the microhardness of LHP crystals has been determined using a Vickers microhardness indentor. The effects of annealing and quenching on the mechanical properties of these crystals have been studied. It is observed that (i) the microhardness of the crystals depends on the applied load and is independent of the duration of loading, (ii) irrespective of the relative orientation of the indentor and the crystal, the median vents initiate at the sharp indentation edges, and (iii) maximum plasticity is observed in quenched crystals. The mechanical behaviour of the crystals has been studied using an Instron compression testing unit. A large anisotropy is observed from experiments on the breaking strength of the crystals and the implications are discussed.

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Authors and Affiliations

  1. Department of Physics, Sardar Patel University, Vallabh Vidyanagar 388120, Gujarat State, India

    C. C. Desai & M. S. V. Ramana

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  1. C. C. Desai
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  2. M. S. V. Ramana
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Desai, C.C., Ramana, M.S.V. Vickers micromechanical indentation and compression testing of ferroelectric lead hydrogen phosphate single crystals. J Mater Sci 23, 617–620 (1988). https://doi.org/10.1007/BF01174695

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  • DOI: https://doi.org/10.1007/BF01174695

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