Soft chemical synthesis and structural characterization of Y2HfxTi2−xO7

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A novel soft chemistry route was developed to synthesize Y2HfxTi2−xO7 (0≤x≤2.0) oxide solid solution. An aqueous solution containing reactants was produced to ensure the combustion reaction taking place at the molecular level. A suite of characterization techniques, including X-ray diffraction, Raman, transmission electron spectroscopy, as well as X-ray absorption near edge structure (XANES), is employed to investigate the structural and phase changes of the series. Both X-ray and electron diffraction patterns show that the Y2HfxTi2−xO7 system undergoes a clear composition-induced phase transition from ordered pyrochlore to disordered defect-fluorite at x~1.5. On the other hand, Raman and XANES spectra reveal a gradual evolution of the local structure with the substitution of Hf for Ti. © 2014 Elsevier Ltd and Techna Group S.r.l.
X-ray diffraction, Ceramics, Pyrochlore, Raman spectroscopy, Diffraction, Order-disorder transformations
Kong, L., Zhang, Z., de los Reyes, M., Karatchevtseva, I., Lumpkin, G. R., Triani, G., & Aughterson, R. D. (2015). Soft chemical synthesis and structural characterization of Y2HfxTi2−xO7. Ceramics International, 41(4), 5309-5317. doi:10.1016/j.ceramint.2014.12.074