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Chapter VII Reactivity at Dislocation…. Conclusion 1. Glacial acetic acid as an etchant revealed dislocations on the (100) surfaces of pure KDP crystals as well as selected amino acids (L-histidine, L-threonine and DL-methionine) doped KDP crystals. 2. The shape of the etch pits did not vary upon the change of temperature from 25 0 C to 40 0 C and also remained invariant for pure and selected amino acids doped KDP crystals. 3. The activation energy was highest for the pure KDP crystals, while its value slightly decreased in the successive manner with the doping of L- histidine, L-threonine and DL- methionine, respectively. This suggested that the most stable nature of KDP crystals and on doping of amino acids it enhanced the reactivity at line defects by facilitating the extra sites for chemical reaction. The chemical structure of amino acids also played important role. 4. The pre-exponential factor value was highest for pure KDP crystal, whereas, the lower values for amino acids doped KDP crystals were observed. The pre exponential factor dropped in its value from ≈10 9 for pure KDP crystals to amino acids doped KDP crystals to ≈10 6 , without much affecting the activation energy. The pre-exponential factor is dependent on the collision frequency and the steric factor. Therefore, it can be conjectured that the dopant amino acids reduce the steric hindrance giving rise to increased reactions sites for the attacking etchant might be due to increased steric factor and the non coplanar NH2 in 275
Chapter VII Reactivity at Dislocation…. various amino acid structure. Further the pre-exponential factor also decreased in successive manner for L-histidine, L-threonine and DL- methionine doped KDP crystals, respectively. The molecular structure of amino acid played important role. 5. There was a systematic downward trend for standard change in enthalpy and the standard change in entropy from pure KDP and selected amino acids doped KDP crystals. Therefore, it can be inferred that the influence of amino acid doping was such that the value of T∆ # S o and ∆ # H o compensated each other so that ∆ # G o remained practically constant for the particular amino acid doping in KDP crystals. 276
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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…. 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 VIII Micro-hardness studies
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Chapter IX General Conclusion estab
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Chapter IX General Conclusion case
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