Microwave plasma synthesis of lanthanide zirconates from microwave transparent oxides

Yi-Hsin Chou, Nicole Hondow, Chris I. Thomas, J. Robert Mitchell, Rik Brydson, Richard E. Douthwaite

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Lanthanide zirconate phases Ln2Zr2O7 and Ln4Zr3O12 (Ln = Y, La, Gd, Dy, Ho, Yb) have been prepd. using a microwave induced plasma methodol., which allows rapid synthesis using materials which do not couple directly with microwaves at room temp. We describe the measurement of heating profiles of the precursor binary metal oxides which can be used to identify conditions conducive to the synthesis of more complex oxides. Uncontrolled heating which can be a feature of microwave synthesis of ceramics is not obsd., allowing reproducible synthesis. Conventionally these phases are prepd. at >1400 °C over hours or days and are being investigated for applications including the immobilization of nuclear waste where rapid processing is important. Using the microwave plasma method, phase-pure materials have been prepd. in minutes. Furthermore, it is clear that Ln2Zr2O7 and Ln4Zr3O12 also exhibit significant plasma-promoted dielec. heating (e.g. >2200 °C for Dy4Zr3O12) which is typically greater than either of the resp. precursors, thus providing a driving force to rapidly complete the reaction. [on SciFinder(R)]
Original languageEnglish
Pages (from-to)2472-2476
Number of pages5
JournalDalton Transactions
Volume41
Issue number8
DOIs
Publication statusPublished - 4 Jan 2012
MoE publication typeA1 Journal article-refereed

Keywords

  • lanthanide zirconate microwave plasma synthesis
  • yttrium zirconate microwave plasma synthesis
  • lanthanum zirconate microwave plasma synthesis
  • gadolinium zirconate microwave plasma synthesis
  • dysprosium zirconate microwave plasma synthesis
  • holmium zirconate microwave plasma synthesis
  • ytterbium zirconate microwave plasma synthesis

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