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Issue 11, 2015
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New, intermediate polymorph of CeAlO3 with hexagonal structure – formation and thermal stability

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Abstract

This work presents the results of studies on solid state reaction in a highly dispersed CeO2–Al2O3 system under a reducing atmosphere. The formation of a new metastable hexagonal form of CeAlO3, isomorphous to hexagonal YAlO3, at 850 °C has been confirmed for the first time by TEM, XRD, FT-IR and measurement of magnetic susceptibility. Above 900 °C, the hexagonal phase transformed into a common tetragonal polymorph. Magnetic susceptibility data indicates that both CeAlO3 polymorphs contain Ce3+ ions, but the unit cell volume per formula unit is noticeably bigger (26%) for the hexagonal polymorph. This may suggest that the hexagonal CeAlO3 polymorph is stabilized by the interaction with the Al2O3 support.

Graphical abstract: New, intermediate polymorph of CeAlO3 with hexagonal structure – formation and thermal stability

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Publication details

The article was received on 05 Nov 2014, accepted on 23 Jan 2015 and first published on 03 Feb 2015


Article type: Paper
DOI: 10.1039/C4CE02201G
CrystEngComm, 2015,17, 2273-2278

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    New, intermediate polymorph of CeAlO3 with hexagonal structure – formation and thermal stability

    M. A. Małecka and L. Kępiński, CrystEngComm, 2015, 17, 2273
    DOI: 10.1039/C4CE02201G

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