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

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

Abstrakti

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)]
AlkuperäiskieliEnglanti
Sivut2472-2476
Sivumäärä5
JulkaisuDalton Transactions
Vuosikerta41
Numero8
DOI - pysyväislinkit
TilaJulkaistu - 4 tammikuuta 2012
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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