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Issue 8, 2012
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Microwave plasma synthesis of lanthanide zirconates from microwave transparent oxides

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Abstract

Lanthanide zirconate phases Ln2Zr2O7 and Ln4Zr3O12 (Ln = Y, La, Gd, Dy, Ho, Yb) have been prepared using a microwave induced plasma methodology, which allows rapid synthesis using materials which do not couple directly with microwaves at room temperature. 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 observed, allowing reproducible synthesis. Conventionally these phases are prepared at >1400 °C over hours or days and are being investigated for applications including the immobilisation of nuclear waste where rapid processing is important. Using the microwave plasma method, phase-pure materials have been prepared in minutes. Furthermore, it is clear that Ln2Zr2O7 and Ln4Zr3O12 also exhibit significant plasma-promoted dielectric heating (e.g. >2200 °C for Dy4Zr3O12) which is typically greater than either of the respective precursors, thus providing a driving force to rapidly complete the reaction.

Graphical abstract: Microwave plasma synthesis of lanthanide zirconates from microwave transparent oxides

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Supplementary files

Article information


Submitted
08 Aug 2011
Accepted
01 Dec 2011
First published
04 Jan 2012

Dalton Trans., 2012,41, 2472-2476
Article type
Paper

Microwave plasma synthesis of lanthanide zirconates from microwave transparent oxides

Y. Chou, N. Hondow, C. I. Thomas, R. Mitchell, R. Brydson and R. E. Douthwaite, Dalton Trans., 2012, 41, 2472
DOI: 10.1039/C2DT12269C

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