Supercritical hydrothermal synthesis of highly crystalline lanthanum zirconate nanoparticles

Daisuke Hojo, Hiroaki Ohara, Tsutomu Aida, Gimyeong Seong, Nobuaki Aoki, Seiichi Takami, Tadafumi Adschiri

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Pyrochlore La2Zr2O7 nanoparticles were synthesised in supercritical water at 450 °C under a relatively short reaction time. Compared to traditional methods, e.g. solid-state reactions, hydrothermal methods, highly crystalline pyrochlore La2Zr2O7 nanoparticles were obtained even under such mild conditions. Furthermore, the supercritical hydrothermal synthesis of La2Zr2O7 nanoparticles was highly sensitive to the solution pH employed, as La(OH)3 and ZrO2 were formed instead of La2Zr2O7 at pH 10 or lower. pH-controlled dissolution of La(OH)3 and ZrO2 thus regulated the formation and growth of La2Zr2O7. This environmentally benign supercritical hydrothermal process will serve as a novel synthetic method for the preparation of La2Zr2O7 with replacing conventional processes.

Original languageEnglish
Pages (from-to)134-138
Number of pages5
JournalJournal of Supercritical Fluids
Publication statusPublished - 2019 Jan


  • LaZrO
  • Nanoparticles
  • Phyrochlore
  • Supercritical hydrothermal
  • pH-controlled dissolution

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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