|About this Abstract
||Materials Science & Technology 2019
||Phase Transformations in Ceramics: Science and Applications
||The Effect of Zr<sup>4+</sup> Co-Substitution on the Phase Transition and Thermal Expansion Properties of RENbO<sub>4</sub> Materials (RE = La<sup>3+</sup>, Dy<sup>3+</sup>, Y<sup>3+</sup>)
||Daniel R. Lowry, Pankaj Sarin
|On-Site Speaker (Planned)
This talk will present updated results on the effect of Zr<sup>4+</sup> co-substitution on the phase transition and thermal expansion properties of LaNbO<sub>4</sub>, DyNbO<sub>4</sub>, and YNbO<sub>4</sub>. Zirconium co-substitution results in the replacement of rare earth and niobium atoms in equal proportion, maintaining charge balance and preventing the formation of vacancy defects. Powders of Zr<sup>4+</sup> co-substituted RENbO<sub>4</sub> were synthesized by stearic entrapment method for a range of Zr<sup>4+</sup> compositions. The effect of co-substitution was studied using calorimetric and in-situ high temperature x-ray diffraction methods. Key results include the effect on crystallite size, solubility limit differences, the transition temperature, and changes to the thermal expansion properties of the low temperature and high temperature phases. Spontaneous strain calculations were used with Landau parameter fitting to determine the changes to the transition temperature. Comparative analysis of crystal structure modifications on Zr- co-substitution will be presented to explain the experimental observations.
||Definite: At-meeting proceedings