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through hydrogen bonds. The functional groups representing amino acids are
obviously absent in the pure KDP samples.
Powder XRD is used to study the variation in the unit cell parameters and
the possibility of presence of any extra phase due to doping of amino acids in
KDP crystals. All samples have showed the single phase nature and not much
variation in unit cell parameters of KDP is observed due to doping.
Chapter IV describes the thermo-gravimetric analysis (TGA) of pure and L-
histidine, L-threonine and DL- methionine doped KDP crystals. The TGA is
carried out from room temperature to 800 o C. It has been observed that amino
acids doped KDP crystals exhibit slightly less thermal stability compared to pure
KDP crystals. This the little disadvantage of doping. The Coats and Redfern
relation is employed to evaluate kinetic and thermodynamic parameters of the
decomposition reaction, the values of both kinetic and thermodynamic
parameters are found to be decreased due to doping of various amino acids.
Chapter V covers the dielectric study of L-histidine, L-threonine and DL-
methionine doped KDP crystals. In the beginning, a brief review of dielectric
study is presented. The dielectric study is carried out on pure and doped KDP
crystals at room temperature by varying the frequency of applied field in the
range from 100 Hz to 100 kHz. The values of dielectric constant and dielectric
loss decrease with increase in frequency of applied field. It have also been
observed that the values of dielectric loss and dielectric constant are less for