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Chapter III CHN Analysis, FT IR …..
short H bonds with two equivalent minima on the potential profile of proton.
Thus, in KDP, H atom connects two PO -1 4 tetrahedra. At the same time, each
PO -1 4 tetrahedron is surrounded by four H atoms that connect it with four
neighboring PO -1 4 tetrahedra.
The H- bonded system in KDP and its analogues like ADP and DKDP
posses continuous three-dimensional H –bond network is recently studied for
proton transfer along H bonds and to effective air coupling of proton that play
the key role on the ferroelectric behavior of crystals and discussed by the
tunneling parameter (Ω) and the Ising parameter (Jij ) by .Dolin et al [47] and
same is represented in figure (3.13)
Figure : 3.13 H surroundings of PO 4 tetrahedron in KDP.
The polymorphism of KDP was reported by Subramony et al [34]. The
structural ordering below Tc in KDP has been studied by using high resolution
neutron diffraction by Nelmes et al [35].The nature of hydrogen bond the
electron density distribution in tetragonal KDP at room temperature was
obtained by Maximum Entropy Method (MEM) using the synchrotron radiation
X-ray powder diffraction data by Yamamura et al [36] .Moreover, the
synchrotron radiation X – ray multiple diffraction study of KDP phase transition
induced by electric field has been reported by Santosh et al [31].The effect of
doping on crystal structure of KDP and the presence of KDP and the
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