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Chapter IV Thermal Studies of ….. Chapter IV Thermal Studies of Pure, L-histidine, L-threonine and DL- 4.1 Introduction methionine Doped KDP Crystals According to widely accepted definition of thermal analysis (Thermo analytical), it is a group of techniques in which physical properties of a substance and/or its reaction products are measured as a function of temperature whilst the substance is subjected to a controlled temperature program [1]. Nearly over a dozen thermal methods can be identified, which differ in the properties measured and temperature programs [2-4]. These methods find widespread use for both quality control and research applications of various substances, such as, polymers, pharmaceuticals, crystals, clays, minerals, metals and alloys. Various thermal techniques are categorized in figure (4.1). Thermo analytical methods involve the measurement of various properties of materials subjected to dynamically changing environments under predetermined condition of heating rate, temperature range and gaseous atmosphere or vacuum. Among all the thermal methods, the most widely used techniques are TGA, DTA and DSC which find extensive use in all fields of inorganic and organic chemistry, metallurgy, mineralogy and many other areas. In many cases, the use of a single thermoanalytical technique may not provide sufficient information to solve the problem on hand and hence the use of other thermal techniques, either independently or simultaneously 159
Chapter IV Thermal Studies of ….. for complementary information becomes necessary. For example, both differential thermal analysis (DTA) and thermo gravimetric analysis (TGA) are widely used in studies involving physicochemical changes accompanied by variation in the heat content and the weight of the material. Figure: 4.1 Various thermo analytical techniques. In the present investigation pure and amino acid doped (L-histidine, L- threonine and DL-methionine) KDP crystals have been studied by employing thermo-gravimetric analysis (TGA) in order to study the effect of doping on thermal stability of KDP crystals and evaluate the kinetic and thermodynamic parameters for the initial stage of dehydration. 4.2 Thermo Gravimetric Analysis Thermo gravimetric analysis is a technique in which the mass of a substance is measured as a function of temperature or time while the 160
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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 V Dielectric Study of …
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Chapter VI UV-Vis Spectroscopic….
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Chapter VIII Micro-hardness studies
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Load (N) Chapter VIII Micro-hardnes
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Chapter IX General Conclusion estab
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Chapter IX General Conclusion case
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