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Chapter III CHN Analysis, FT IR …..
amino acid doped KDP crystals. As the doped amino acid is expected to form
a bond with hydrogen atom of KDP, which is resulted in to altered
fundamental vibrations and the values of force constants are lower for doped
crystals in comparison to pure KDP crystals as that can be seen from table
(3.4).
Table: 3.4 Values of force constant for pure and different amino acids doped KDP
crystals.
Samples Force Constant for
O-H Vibrations
(Nm -1 )
(frequency
in cm -1 )
Pure KDP Crystal 710 3580
143
Absorption
KDP + 0.3% L-histidine 640 3445
KDP + 0.4% L- histidine 639 3492
KDP + 0.5% L- histidine 639 3439
KDP + 0.3% L-threonine 670 3440
KDP + 0.4% L- threonine 680 3419
KDP + 0.5% L- threonine 685 3462
KDP + 0.3% DL-methionine 657 3481.7
KDP + 0.4% DL-methionine 650 3500
KDP + 0.5% DL-methionine 667 3510.0
3.5.1 X-ray Diffraction by Powder Method
The powder X-ray diffraction (XRD) was devised independently in 1916
by Peter Joseph William Debye, a Nobel Laureate and P. Scherrer in
Germany and in1917 by A. W. Hull in United States [22,23]. The powder XRD
is a non-destructive technique widely used for the characterization of a variety
of crystalline materials. This method has been conventionally used for phase