The synthesis, crystal chemistry and dielectric properties of AB2O6 euxenite and aeschynite compounds.
Gung, Zhi Yang.
Date of Issue2008
School of Materials Science and Engineering
This report describes the synthesis of yttrium-euxenite (euxenite-Y) (Y(Ti0.5Nb0.5)2O6), neodymium-aeschynite (aeschynite-Nd) (Nd(Ti0.5Nb0.5)2O6), and Gd[(SnxTi0.5-x)Nb0.5]2O6, where x = 0.05, 0.125, 0.25 & 0.5, investigates the crystal chemical properties of euxenite-Y and aeschynite-Nd, and surveys the dielectric performance of novel Gd[(SnxTi0.5-x)Nb0.5]2O6 compounds. Both pellets and powders were fabricated. The pellets were examined using scanning electron microscopy (SEM) together with energy dispersive x-ray (EDX) spectroscopy to observe the microstructure, microchemistry and homogeneity. The dielectric performance of Gd[(SnxTi0.5-x)Nb0.5]2O6 and other RE(Ti0.5Nb0.5)2O6 compounds, where RE = Y, Dy, Gd (with euxenite structure) or La, Nd, Sm (with aeschynite structure) pellets were surveyed using impedance/gain-phase analysis. Powders were characterized using powder x-ray diffraction (PXRD) and analyzed by the Rietveld method to refine crystal structures and conduct quantitative phase analysis.
DRNTU::Engineering::Materials::Microelectronics and semiconductor materials
Nanyang Technological University