J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (9): 1966-1976.DOI: 10.1016/j.jmst.2019.04.013

• Orginal Article • Previous Articles     Next Articles

Synthesis and microstructure characterization of tetragonal Zr1-xTixO2 (x = 0-1) solid solutions

Linggen Kong*(), Inna Karatchevtseva, Hanliang Zhu, Meng Jun Qin, Zaynab Aly   

  1. Nuclear Fuel Cycle Research, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW, 2232, Australia
  • Received:2018-10-29 Revised:2018-12-07 Accepted:2019-01-26 Online:2019-09-20 Published:2019-07-26
  • Contact: Kong Linggen
  • About author:

    1 These authors contributed equally to this work.

Abstract:

Oxide powders of Zr1-xTixO2 (x = 0-1) solid solutions with micron-sized particles were synthesized via a solution combustion method. The synthesis process and Zr/Ti molar ratio were optimized to produce powders with the tetragonal crystal structure. X-ray diffraction, Raman spectroscopy and transmission electron spectroscopy results confirm that a full crystallization microstructure with the single tetragonal phase is obtained after calcination at 600 °C while maintaining the crystallite size <30 nm. Zr/Ti oxide mixtures with Zr ≥ 67 mol% exhibit a tetragonal crystal structure and the embedding Ti in ZrO2 improves the structure stability. The nitrogen sorption results indicate that the powders possess mesoporous morphology with medium specific surface areas ($\widetilde{1}$0-50 m2/g). Chemical stability tests show that these powders are relatively stable with negligible removal of titanium and zirconium after elution by 0.5 mol/L HCl. Density functional theory was used to calculate the most stable structure with low energy for the selected composition.

Key words: Tetragonal, Titanium zirconate, Solid solution, Chemical synthesis