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Load (N) Chapter VIII Micro-hardness studies… Table (8.1): Values of Vickers micro-indentation hardness in (MPa) at different loads Pure KDP for pure and amino acid doped KDP crystals KDP + L-histidine KDP + L-threonine KDP + DL-methionine 0.3 % 0.4 % 0.5 % 0.3 % 0.4 % 0.5 % 0.3 % 0.4 % 0.5 % 0.294 1884.5 1854.23 1838.34 1831.34 1864.93 1862.32 1852.32 1861.87 1859.87 1849.17 0.491 1652.9 1632.46 1624.47 1622.81 1643.86 1640.86 1639.12 1647.27 1638.17 1630.19 0.588 1515.2 1395.59 1392.82 1385.12 1404.22 1394.22 1381.51 1400.54 1391.54 1389.04 0.686 1416.6 1349.12 1348.5 1333.71 1352.44 1342.44 1335.21 1352.96 1349.26 1339.11 0.784 1358.4 1320.58 1320.11 1315.05 1324.58 1320.12 1319.11 1323.21 1318.03 1315.93 0.981 1296.3 1294.56 1292.19 1288.93 1294.56 1289.51 1288.09 1292.41 1288.01 1284.25 One can notice that, for particular applied load, the Vickers micro- hardness decreases as the amount of doping of particular amino acid increases. This indicates that the doping of amino acids reduces the Vickers micro-hardness for a particular load. Suthar [62] has observed that as the amount of doping of Mn +2 and Cu +2 increases, the Vickers micro-hardness value decreases for Calcium levo- tartrate tetrahydrate crystals at high load region. The doping of metallic impurity facilitated the slip mechanism and made the samples softer. Hv (In MPa) 1900 1800 1700 1600 1500 1400 1300 1200 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Load P (in N ) Figure: 8.5a Plot of H v Vs load for pure and L-histidine doped KDP crystals. 299 Pure KDP KDP + 0.3 wt. % L-histidine KDP + 0.4 wt. % L-histidine KDP + 0.5 wt. % L-histidine
Chapter VIII Micro-hardness studies… Hv (in MPa) Figure: 8.5b Plot of Hv Vs load for pure and DL-methionine doped KDP crystals. Hv (In M Pa) 1900 1800 1700 1600 1500 1400 1300 Load p (In N) Figure: 8.5c Plot of Hv Vs load for pure and L-threonine doped KDP crystals. The hardness is related to yield stress by 300 H = 2.78σy (8.5) This has been used for the materials that do not work-harden appreciably [63]. It is found experimentally that best fit values are obtained for the following equation [64]. 1200 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1900 1800 1700 1600 1500 1400 1300 1200 Load (in N ) H = 3σy (8.6) The yield stress calculated for high load region for pure and amino acid doped KDP crystals and tabulated in table (8.2). Pure KDP KDP + 0.3 wt % DL-methionine KDP + 0.4 wt % DL-methionine KDP + 0.5 wt % DL-methionine Pure KDP KDP + 0.3 wt. % L-threonine KDP + 0.4 wt. % L-threonine KDP + 0.3 wt. % L-threonine 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
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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 VII Reactivity at Dislocati
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