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Chapter VIII Micro-hardness studies… Conclusions 1. The Vickers micro-hardness of pure and amino acids doped KDP crystals is a load dependent quantity and the variation is prominent in low load regime. Initially the Vickers micro-hardness decreased with increasing the load very steeply and then for higher loads it decreases rather gradually and became virtually independent of load. Thus the Indentation size effect (ISE) was observed for both the pure and amino acid doped KDP crystals. 2. With increase in the concentration of a dopant (amino acids) the Vickers micro-hardness also reduced at a considered load value in KDP crystals. The Vickers micro-hardness decreased as amino acid doping level was increased indicating that the KDP crystals became softer. 3. The ISE has been verified by using the Kick’s law. From the plots of log P versus log d, the values of work hardening coefficient ‘n’ and the standard hardness ‘a’ were obtained. The values of ‘n’ and ‘a’ were constant and these values changed marginally with increased concentration of doping in random manner. The variation of Vickers micro-hardness with load agreed well with the nature obtained by the other workers on the (100) faces of pure KDP crystals. 4. The values of the load independent hardness and the Newtonian pressure (W) were higher in pure KDP crystals than the amino acids doped KDP crystals. It was found that as the doping concentration of amino acids increased the values of load independent hardness and Newtonian pressure decreased. This further indicated that the doping of amino acids had softened the KDP crystals slightly. 323
Chapter VIII Micro-hardness studies… 5. According to Hays and Kendall law, the plots of d 2 Vs load P are straight lines for pure as well as amino acids doped KDP crystals. From the application of PSR model, the linear relation between P/d and d was observed for both pure and amino acids doped KDP crystals. This suggested the ISE behavior. The standard hardness ‘a’ was obtained. It was observed that for pure KDP the values of Pc/do 2 and ‘a’ is higher compared to the amino acids doped KDP crystals. 6. For the indentation greater than loads ~ 0.25 N cracks were observed on the (100) faces of pure and amino acid doped KDP crystals. The crack length ‘c’ was found to be approximating to 3/2 power of the load P and Anstis model was applied to obtain the values of toughness fracture Kc.. It can be concluded that as the doping concentration increased the Vickers micro-hardness values decreased and also the fracture toughness decreases, this suggested that the doping of different amino acids in KDP crystals made them slightly soft and also more fragile to produce cracks easily. 7. As the load increased the fracture toughness decreased in the case of pure and amino acids doped KDP crystals. This supported the ISE behavior. Further, with the increase in dopant concentration the value of fracture toughness decreased for all the three dopants viz. L-histidine, L- threonine, DL-methionine for different values of load. This effect was more prominent at low loads suggesting surface effect due to the dopants. 324
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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 III CHN Analysis, FT IR …
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