Polar noncentrosymmetric ZnMoSb2O7 and nonpolar centrosymmetric CdMoSb4O10: d10 transition metal size effect influencing the stoichiometry and the centricity

European Chemistry Congress

June 16-18, 2016 Rome, Italy

Hongil Jo and Kang Min Ok

Chung-Ang University, Korea

Posters & Accepted Abstracts: Chem Sci J

Abstract :

Functional oxides have attracted attention owing to their various applications in electronics, catalyst and optical devices with superior thermal stability. One of them, noncentosymmetric (NCS) oxides have been studied by plenty of research group because they have diverse properties such as pyroelectricity, ferroelectricity, piezoelectricity and nonlinear optical properties at the same time. Thus, several strategies for synthesizing novel NCS materials have been continuously proposed. In this research, we successfully synthesized two novel NCS materials by combining Second-Order Jahn-Teller (SOJT) distortive d0 cations, lone pair cations, and polar displacive d10 cations, i.e, Mo6+, Sb3+, and Zn2+ (or Cd2+). Two new molybdenum antimonites have been synthesized by hydrothermal and standard solid state reactions. The ZnMoSb2O7 crystallizes polar space group P21 along with three-dimensional framework composed of MoO4, SbO4, and ZnO4 polyhedra. While CdMoSb4O10 crystallizes nonpolar centrosymmetric space group P21/m along with one-dimensional framework consisting of MoO4, SbO3, and CdO6 polyhedra. For ZnMoSb2O7, structural analysis suggests that it has a net polarization in the [0-10] direction due to parellel alignment of MoO4 distorted tetrahedra. Local dipole moment calculation is consistent with structural analysis. The result of synthetic experiments for ZnMoSb4O10 and CdMoSb2O7 show that the size of d10 cation affect stoichiometry as well as symmetry. The two molybdenum antimonites were also fully characterized by powder X-ray diffraction, IR spectroscopy, UV-vis spectroscopy, and powder second-harmonic generation measurements.

Biography :

Jo Hongil has completed his bachelor degree at the age of 26 years from Chung-Ang University and pursues his combined master’s and doctorate program at Chung-Ang University. He is studying solid chemistry and advised by Prof. Ok Kang Min. He has published 3 papers in reputed journals.
Email:drddrdr@naver.com