Abstract
Ferroelectric lead hydrogen phosphate (LHP) and lead nitrate phosphate (LNP) single crystals are grown together by slow diffusion of lead nitrate by sodium metasilicate gels impregnated with orthophosphoric acid. A brief description of the material preparation, growth procedure and crystal nucleation, is given. Bright and transparent prismatic LHP crystals up to 7 × 4 × 3 mm 3 and LNP crystals up to 12 × 6 × 3 mm 3 in size are obtained. It is observed that the growth rate of the LNP crystals is faster than that of the LHP crystals. Results obtained on characterization of these two crystals chemical, and on analysis, X-ray diffraction, EDAX, etc. are reported. The microhardness and Young modulus of these crystals are determined. The average density of dislocations has been determined by employing the chemical etching technique and found to be 3 × 10 2 cm -2 in LHP and 7 × 10 2 cm -2 in LNP crystals. The implications are discussed.
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