|About this Abstract
||Materials Science & Technology 2012
||In-situ Characterization of Phase Transformations in Materials
||Thermal Properties and Phase Transition of 2ZrO2ĚP2O5 Studied by In-situ Synchrotron X-ray Diffraction Experiments
||Joachim Angelkort, Pankaj Sarin, Zachary A. Jones, Stephen Letourneau, Zlatomir D. Apostolov, Waltraud M. Kriven
|On-Site Speaker (Planned)
||Waltraud M. Kriven
High-temperature in-situ x-ray powder diffraction experiments were carried out to investigate the phase transition mechanism of 2ZrO2ĚP2O5 (Z2P). The crystal structures of the low-temperature (α-Z2P) and the high-temperature phase (β-Z2P) were determined as a function of temperature. Linear thermal expansion coefficients were calculated from the thermal expansion of the unit cell parameters of α- and β-Z2P. The phase transition from the α- into the β-phase is most notably accompanied with an increase of the average atomic distance of neighboring Zr atoms. The bond valence method was used to calculate the valences of the atoms in Z2P as well as the contributions of different atoms to the valence of the metal atom. In analogy to the metal-metal interactions in the d1 transition metal compounds the metal-metal interactions in Z2P seem to increase the stability of the low-temperature phase.