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Hydrothermal synthesis of a B-Site magnetic ruthenate pyrochlore

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Darton, Richard J., Turner, S. S. (Scott S.), Sloan, Jeremy, Lees, Martin R. and Walton, Richard I.. (2010) Hydrothermal synthesis of a B-Site magnetic ruthenate pyrochlore. Crystal Growth & Design, Vol.10 (No.8). pp. 3819-3823. ISSN 1528-7483

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Abstract

The pyrochlore oxide ((Ce0.67Na0.33)-Na-IV)(2)(Ru2O7)-O-IV crystallizes directly as a phase-pure sample, without the need for postsynthesis annealing, from aqueous solutions of Ru3+, Ce3+ and sodium hydroxide in the presence of hydrogen peroxide as oxidizing agent at less than 250 degrees C. The structure has been relined using powder neutron diffraction and is consistent with electron diffraction and EDXA analysis performed using transmission electron microscopy (cubic Fd (3) over barm with a = 10.1659(1) angstrom). The pyrochlore phase is metastable and upon heating to similar to 400 degrees C begins to phase separate to ultimately yield a mixture including Na2Ru4O9, RuO2, Ce2O3, and CeO2. Magnetization measurements confirm that the material is a new example of a B-site magnetic pyrochlore, analogous to the known phase Y2Ru2O7, but that show evidence for magnetic frustration at low temperatures. Heat capacity measurements and low-temperature neutron diffraction indicate the possibility of spin-glass-like behavior with no evidence of long-range magnetic order achieved at low temperature.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science > Chemistry
Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Thermochemistry, Solid state chemistry, Ruthenium, Oxides, Crystal growth
Journal or Publication Title: Crystal Growth & Design
Publisher: American Chemical Society
ISSN: 1528-7483
Official Date: August 2010
Volume: Vol.10
Number: No.8
Number of Pages: 5
Page Range: pp. 3819-3823
Identification Number: 10.1021/cg100728s
Status: Peer Reviewed
Publication Status: Published
Funder: Engineering and Physical Sciences Research Council (EPSRC)
Grant number: EP/F012721 (EPSRC)
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URI: http://wrap.warwick.ac.uk/id/eprint/5470

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