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Issue 12, 2014
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Synthesis, anion order and magnetic properties of RVO3−xNx perovskites (R = La, Pr, Nd; 0 ≤ x ≤ 1)

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Abstract

The rare earth vanadium oxynitride perovskites RVO3−xNx (R = La, Pr, Nd; 0 ≤ x ≤ 1) have been prepared by treatment of RVO4 precursors in NH3. The ammonolysis reactions proceed through an initial reduction of RVO4 precursors to RVO3 perovskites that are progressively nitrided and reoxidised to RVO3−xNx materials with varying proportions of V4+/V3+. Variable temperature neutron diffraction studies show that NdVO2N and PrVO2.24N0.76 have orthorhombic Pbnm symmetry between 3.5 and 300 K, but LaVO2.11N0.89 undergoes a broad Pbnm to R[3 with combining macron]c structural transition over this temperature range. In LaVO3−xNx samples the proportion of the R[3 with combining macron]c phase at room temperature increases with the nitrogen content. The partial anion order indicative of planes of cis-VN2 chains found in NdVO2N is also present in PrVO2.24N0.76, and is thus robust to the disorder created by non-stoichiometry. Magnetic measurements reveal spin freezing transitions at low temperatures in LaVO2.09N0.91 and PrVO2.24N0.76, but NdVO2N is paramagnetic.

Graphical abstract: Synthesis, anion order and magnetic properties of RVO3−xNx perovskites (R = La, Pr, Nd; 0 ≤ x ≤ 1)

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Article information


Submitted
28 Nov 2013
Accepted
10 Jan 2014
First published
13 Jan 2014

J. Mater. Chem. C, 2014,2, 2212-2220
Article type
Paper

Synthesis, anion order and magnetic properties of RVO3−xNx perovskites (R = La, Pr, Nd; 0 ≤ x ≤ 1)

J. Oró-Solé, L. Clark, N. Kumar, W. Bonin, A. Sundaresan, J. P. Attfield, C. N. R. Rao and A. Fuertes, J. Mater. Chem. C, 2014, 2, 2212
DOI: 10.1039/C3TC32362E

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