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Chapter VII Reactivity at Dislocation…. dissolution. But the later mechanism, involving stationary dissolution, is due to the geometrical arrangement of atoms/ molecules layers that localizes energy around them. It was suggested by Cabrera [21] that the transition from stationary to spontaneous non-stationary dissolution takes place at a critical value of under saturation. The verification of the Cabrera’s model in the case of KDP crystals was carried out by Koziejowska and Sangwal [59]. They have found that existence of an under saturated barrier above which dislocation etch pits were easily formed. For the (001) and (110) faces of KDP, the values of these under saturations were found to be 9 % and 6.4 %, respectively. They concluded that the preferred occurrence of dissolution of crystal edges indicated that the surface dissolution took place by surface nucleation process, consequently, the Cabrera’s theory of etch pit formation held good in the case of KDP. 7.6 Chemical Etching Procedure The pure and amino acids doped KDP crystals were grown by slow solvent evaporation technique, which has been already explained in chapter II. The (100) face of pure and amino acids doped KDP crystals selected for the chemical etching studies. The etchant used for all crystals were AR grade glacial acetic acid (CH3COOH). For every etching process, fresh etchant was used. The etching time was selected 10 second. For high temperature etching, the beaker containing etchant was heated by using suitable water bath of ±0.1 0 C accuracy and the crystal was dipped into the etchant for 10 seconds and, thereafter, removed and air dried before observation under microscope. A soft tissue cleaning was also done before air drying. The etching temperature was varied 263
Chapter VII Reactivity at Dislocation…. from 25 0 C to 40 0 C with increment of 5 0 C. The etch pits were observed by using Carl Zeiss NU2 microscope. For the measurements of etch pits width a filar eye- piece attached with microscope was used. Figure (7.2) shows the photograph of Carl Zyss microscope. Figure: 7.2 Photograph of Carl Zyss microscope. 7.7 Etching Studies of Pure and Amino Acids Doped KDP Crystals. Photomicrographs of etch pits observed on (100) face of pure and 0.3 wt % L – histidine, L-threonine and DL-methionine doped KDP crystals etched at 30 0 C and 40 0 C are shown in figures (7.3 a-h). a b 264
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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 IX General Conclusion estab
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Chapter IX General Conclusion case
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