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Chapter VIII Micro-hardness studies… Figure: 8.6 Plots of log P Vs log d for pure (a) and 0.3,0.4 & 0.5 wt % L-histide (b-d), L- threonine (e-g) and DL-methionine (h-J) doped KDP crystals,respectively. It can be seen that the plots exhibit a straight line nature and the value of n calculated and listed in table (8.2). The values of n being less than 2 indicate that the Vickers micro-hardness values are increasing with decreasing the appiled load in low load region. The values of standard hardness are slightly less in amino acid doped KDP crystals than pure KDP crystals. Also, marginal changes in the work hardening coefficient and the standard hardness are found for different amino acid doped KDP crystals. 305
Chapter VIII Micro-hardness studies… Table: 8.2 Yield stress, first order elastic stiffness constant at 100g load, work hardening coefficient and standard hardness values for pure and amino acid doped KDP crystals. Samples Pure KDP Crystal KDP + 0.3% Lhistidine KDP + 0.4% Lhistidine KDP + 0.5% Lhistidine KDP + 0.3% Lthreonine KDP + 0.4% Lthreonine KDP + 0.5% Lthreonine KDP + 0.3% DL-methionine KDP + 0.4% DL-methionine KDP + 0.5% DL-methionine Yield Stress σy (MPa) 8.6 Hays and Kendall law First Order Elastic Stiffness Constant C11 (MPa) In the present study, the micro-hardness has a relatively larger value at low loads. The micro-hardness shows a steep decrease with increasing loads up to about 0.294 N and, thereafter, the micro-hardness becomes almost constant. Mott [6] quotes several reports where such behaviors have been observed. Pratap and Hari Babu [84] in their study of ammonium halide crystals and Kotru [85] in his study of rare earth compound crystals observed similar load dependence. Suthar [62] applied Hays and Kendall law to Mn +2 and Cu +2 doped calcium levo-tartrate tetrahydrate crystals. According to the approach of Hays and Kendall [14] this type of load variation can be due to the sample exerting a Newtonian pressure on the loaded indenter. This resultant pressure (W) is a function of the material being 306 Work Hardening Coefficient n Standard Hardness a (MPa) 432.1 280049.4 1.461 12887 431.5 279391.9 1.468 12643 430.7 278497.4 1.472 12601 429.6 277269.0 1.474 12552 431.5 279391.9 429.8 277487.4 429.4 276952.9 430.8 278580.4 429.3 276922.8 428.0 275509.6 1.463 1.484 1.497 1.469 1.472 1.499 12604 12585 12501 12504 12452 12360
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Saurashtra University Re - Accredit
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Statements Under O. Ph.D.7 of Saura
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ACKNOWLEDGEMENT The author expresse
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in-law, Mother- in -law and all oth
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of NLO materials in rapidly develop
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doped samples in comparison to the
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micro-hardness decreases. Also, as
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Papers Published in National and In
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Seminar on Recent Advances in Conde
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Chapter I Brief Introduction... Cha
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Chapter II Solution Growth…. Tabl
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Chapter II Solution Growth…. Alto
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Chapter II Solution Growth…. evap
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Chapter II Solution Growth…. vapo
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Chapter III CHN Analysis, FT IR …
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Chapter VI UV-Vis Spectroscopic….
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Chapter VII Reactivity at Dislocati
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