Study of XRD, FT-IR and Nonlinear Optical Properties of Doped and Undoped Barium Iodate Crystals Grown in Silica Gel

Abstract

Abstract-Single crystals of barium iodate were grown by simple gel technique by single diffusion method. By varying various parameters, optimum conditions for the growth were established. Crystals having different morphologies and habits were obtained. Prismatic, prismatic pyramidal, dendritic crystals were obtained. Some of them were transparent, some were transluscent, and few others were opaque. The crystals were doped by impurities such as Fe 3+ and Cu 2+ . The formation of the compound was verified by X-ray diffractograms. The results were compared with the standard values given in JCPDS file. It confirms that the grown crystals are barium iodate, monohydrate. Structural analysis was carried out using FT-IR technique. It confirms the iodate group of the grown crystals. Nonlinear optical properties were studied by using powder second harmonic generation method. Effect of doping of Fe 3+ and Cu 2+ on the structure and nonlinear optical properties of bulk crystals was studied. Doping has no effect on the structure. Doping of Cu +2 inhibits nonlinear behavior of the substance, while Fe +3 doping of has less negative effect.

Piezoelectricity and related properties in orthorhombic cadmium diiodate

“…Shitole demonstrated a progressive decomposition of Cd(IO 3 ) 2 by I 2 and O 2 release with Cd 5 (IO 4 ) 2 as the final compound. 25 In our case, CdO is clearly identified by X-ray diffraction consistent with the mass loss (inset in Fig. 2).…”

“…500-690) cm À1 range. This results contrasts with the frequency range where the n 1 and n 3 vibrations of a free iodate ion are observed 25,50,51 and shows the limitation of the free polyhedron model. The identification with our experimental spectrum shows that only 8 experimental bands (over the 18 expected) can be observed considering the resolution of our experimental spectrum (Fig.…”

“…Only the mid-infrared spectrum has been reported with an attempt to assign the iodate groups. 25 The piezoelectric properties remain still unknown today.…”

“…SHG and electronic properties have also been investigated by Ravi Kumar et al 24 However, their observations on SHG are not consistent with the measurements of Shitole. 25 Ravi Kumar et al 24 measured a SHG efficiency higher in CDI than in potassium dihydrogen phosphate (KDP) whereas Shitole 25 observed the opposite trend. This inconsistancy could be related to the crystal quality.…”

“…In contrast to SHG, the experimental vibrational dynamics of CDI have been almost unexplored. Only the mid-infrared spectrum has been reported with an attempt to assign the iodate groups 25 . The piezoelectric properties remain still unknown today.…”