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Eun Jeong Cho

Eun Jeong Cho

Chung-Ang University, Republic of Korea

Title: Hydrothermal synthesis, crystal structure, and second-harmonic generating (SHG) properties of a new layered bismuth oxyfluoride nitrat

Biography

Biography: Eun Jeong Cho

Abstract

A new layered noncentrosymmetric (NCS) bismuth oxyfluoride-nitrate was synthesized by a hydrothermal reaction. The crystal structure was determined by powder and single-crystal X-ray diffraction. The material crystallizes in a NCS trigonal space group, R3 (No. 146). The constituting [Bi6O7F3]+ cationic layer contains H2O and nitrate anion makes a charge balance. The powder second harmonic generation (SHG) measurements indicate the title compound is phase-matchable (Type I) and exhibits a strong SHG efficiency of about 90 times that of α-SiO2. Detailed structural examination suggests that the π-conjugate system of nitrate anion directly influence the nonlinear optical (NLO) properties of the material. Infrared and UV–vis diffuse–reflectance spectroscopy, energy dispersive X-ray spectroscopy (EDS), thermogravimetric analysis (TGA), and local dipole moment calculations are also presented.