Load and directional effects on microhardness and estimation of toughness and brittleness for flux-grown LaBO3 crystals |
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Authors: | A Jain A K Razdan P N Kotru B M Wanklyn |
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Affiliation: | (1) Department of Physics, University of Jammu, 180001 Jammu, India;(2) Department of Physics, Clarendon Laboratory, University of Oxford, OX1 3PU Oxford, UK |
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Abstract: | Results of microhardness measurements on (100) and (110) planes of flux-grown LaBO3 crystals, in the applied load range of 10–100g, are presented. The microhardness was found to decrease with increasing load in a non-linear manner. By applying Hays and Kendall's law, the materials resistance pressure and other constants of the equation could be calculated. Hardness anisotropy, showing periodic variation of H
v with the maxima and minima repeating at every 15° change in orientation of the indentor, is described and discussed. H
max/Hmin are estimated as 1.14 and 1.06 for (100) and (110) planes, respectively. The fracture toughness values, K
c, determined from measurements of crack lengths, are estimated to be 1.6, 1.7 MN m–3/2 (for (100) planes) and 1.2, 1.5 MN m–3/2 (for (110) planes) at 90 and 100g loads, respectively. The brittleness index, B
i, is estimated as 4.6, 4.0 m–1/2 (for (100) planes) 6.0, 4.6 m–1/2 (for (110) planes) at 90 and 100g, loads respectively. |
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