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

Judith Oró-Solé, Lucy Clark, Nitesh Kumar, William Bonin, A. Sundaresan, J. Paul Attfield*, C. N R Rao, Amparo Fuertes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The rare earth vanadium oxynitride perovskites RVO3-x Nx (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-x Nx 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 LaVO 2.11 N 0.89 undergoes a broad Pbnm to R3c structural transition over this temperature range. In LaVO 3-x Nx samples the proportion of the R3c 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 PrVO 2.24 N 0.76, and is thus robust to the disorder created by non-stoichiometry. Magnetic measurements reveal spin freezing transitions at low temperatures in LaVO 2.09 N0.91 and PrVO2.24N0.76, but NdVO2N is paramagnetic.
Original languageEnglish
Pages (from-to)2212-2220
Number of pages9
JournalJournal of Materials Chemistry C Materials for optical and electronic devices
Volume2
Issue number12
Early online date13 Jan 2014
DOIs
Publication statusPublished - 28 Mar 2014

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