The structure of piezoelectric ceramic in Pb [(Zn (1/3) Nb (2/3))(Sn-1/2 Nb-2/3](Zr,Ti) O-3 system is studied through XRD and TEM analysis. The effects of substitution of Ba2+Sr2+ for Pb2+ and small amount of dopants ...The structure of piezoelectric ceramic in Pb [(Zn (1/3) Nb (2/3))(Sn-1/2 Nb-2/3](Zr,Ti) O-3 system is studied through XRD and TEM analysis. The effects of substitution of Ba2+Sr2+ for Pb2+ and small amount of dopants such cis MnO2 and Sb2O3 on the structure are investigated. The difference between unpolarized and polarized XRD patterns and the structure of ferroelectric domains is emphatically! studied. The result shows that the samples are of the tetragonal perovskite-type structure. The dopants change the tetragonal of samples and grain size but have no effect on the crystal phase. Tile effects of polarizing on the structure can be proved from the deformation of unit cell in microscopic state and rotation of 90 degrees ferroelectric domains in microscopic state.展开更多
An organic nonlinear optical material 2-Amino-4-methylpyridinium 2-chloro 4-nitro benzoate (AMPCNB) was synthesized and large size single crystals were grown by slow evaporation solution growth method. Single crystal ...An organic nonlinear optical material 2-Amino-4-methylpyridinium 2-chloro 4-nitro benzoate (AMPCNB) was synthesized and large size single crystals were grown by slow evaporation solution growth method. Single crystal X-ray diffraction study showed that the title compound belongs to monoclinic crystal system with P2<sub>1</sub>/n space group. A powder XRD study was performed to ascertain its phase. The UV–VIS-NIR study was performed to investigate the transparency window and lower cutoff wavelength of the compound, no absorption has been observed between 318 and 1100 nm. The third harmonic efficiency of the title compound has been studied using the Z-scan technique using continuous-wave Nd:YAG laser to confirm its saturable absorption and self-defocusing effect. The photo conducting and charge transport properties are analyzed using photoconductivity and dielectric measurements. Theoretical calculation of molecular polarizability, which is helpful in device fabrication, was carried out from Penn gap, Clausius-Mosotti equations and the obtained results were compared. Mechanical properties of the grown crystal were investigated by Vicker’s microhardness study.展开更多
文摘The structure of piezoelectric ceramic in Pb [(Zn (1/3) Nb (2/3))(Sn-1/2 Nb-2/3](Zr,Ti) O-3 system is studied through XRD and TEM analysis. The effects of substitution of Ba2+Sr2+ for Pb2+ and small amount of dopants such cis MnO2 and Sb2O3 on the structure are investigated. The difference between unpolarized and polarized XRD patterns and the structure of ferroelectric domains is emphatically! studied. The result shows that the samples are of the tetragonal perovskite-type structure. The dopants change the tetragonal of samples and grain size but have no effect on the crystal phase. Tile effects of polarizing on the structure can be proved from the deformation of unit cell in microscopic state and rotation of 90 degrees ferroelectric domains in microscopic state.
文摘An organic nonlinear optical material 2-Amino-4-methylpyridinium 2-chloro 4-nitro benzoate (AMPCNB) was synthesized and large size single crystals were grown by slow evaporation solution growth method. Single crystal X-ray diffraction study showed that the title compound belongs to monoclinic crystal system with P2<sub>1</sub>/n space group. A powder XRD study was performed to ascertain its phase. The UV–VIS-NIR study was performed to investigate the transparency window and lower cutoff wavelength of the compound, no absorption has been observed between 318 and 1100 nm. The third harmonic efficiency of the title compound has been studied using the Z-scan technique using continuous-wave Nd:YAG laser to confirm its saturable absorption and self-defocusing effect. The photo conducting and charge transport properties are analyzed using photoconductivity and dielectric measurements. Theoretical calculation of molecular polarizability, which is helpful in device fabrication, was carried out from Penn gap, Clausius-Mosotti equations and the obtained results were compared. Mechanical properties of the grown crystal were investigated by Vicker’s microhardness study.
