337 research outputs found
Au9+ swift heavy ion irradiation of Zn[CS(NH2)2]3SO4 crystal: Crystalline perfection and optical properties
The single crystal of tris(thiourea)zinc sulphate (Zn[CS(NH2)2]3SO4) was
irradiated by 150 MeV Au9+ swift heavy ions and analyzed in comparison with
pure crystal for crystalline perfection and optical properties. The Fourier
transform infrared and x-ray powder diffraction inferred that swift ions lead
the disordering and breaking of molecular bonds in lattice without formation of
new structural phases. High resolution X-ray diffraction (HRXRD) revealed the
abundance of point defects, and formation of mosaics and low angle grain
boundaries in the irradiated region of crystal. The swift ion irradiation found
to affect the lattice vibrational modes and functional groups significantly.
The defects induced by heavy ions act as the color centers and resulted in
enhance of photoluminescence emission intensity. The optical transparency and
band gap found to be decreased.Comment: 7 page
Effect of alkali metal doping on the properties and crystalline perfection of bis(thiourea)zinc(II) chloride crystals
The influence of sodium doping on the properties of bis(thiourea)zinc(II) chloride crystals has been described. The reduction in the intensity observed in powder X-ray diffraction of doped specimen and slight shifts in vibrational frequencies confirm the lattice stress as a result of doping. The incorporation of Na(I) into the crystal lattice was confirmed by energy dispersive X-ray spectroscopy. Surface morphological changes due to doping of the alkali metal are observed by scanning electron microscopy. The TG-DTA studies reveal the purity of the material and no decomposition is observed up to the melting point. The high resolution X-ray diffraction studies reveal that the crystalline quality is improved considerably by doping with alkali metal. High transmittance is observed and cut off lambda is similar to 270 nm
Crystalline perfection, EPR, prism coupler and UV-VIS-NIR studies on Cz-grown Fe-doped LiNbO3: A photorefractive nonlinear optical crystal
Growth and characterization of benzil single crystals using nanotranslation by the modified vertical Bridgman technique
Benzil single crystals have been grown by the modified vertical Bridgman technique using the double
wall ampoule with nanotranslation for the first time. The characterization studies of benzil crystals
grown by both single and double wall ampoules were analyzed. The grown benzil crystal was confirmed
by single crystal and powder X-ray diffraction analyses. Fourier transform infrared analysis confirms
the functional groups of the grown benzil. High resolution X-ray diffraction analysis indicates the
crystalline perfection of the grown crystals. The UV-Vis-NIR studies show that the grown benzil
crystals cutoff wavelength is around 434 nm. The green emission of the grown benzil was identified by
photoluminescence studies. The thermal property of the grown benzil was studied by thermogravimetric and differential thermal analyses. The dielectric measurements of benzil crystals were carried out with different frequencies and temperatures and the results indicate an increase in
dielectric and conductivity parameters with the increase of temperature at all frequencies. The second
harmonic conversion efficiency of the grown benzil was determined
Crystal growth, structural and optical characterization of a semi-organic single crystal for frequency conversionapplications
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