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

Oró-Solé, Judith ; Clark, Lucy ; Kumar, Nitesh ; Bonin, William ; Sundaresan, A. ; Attfield, J. Paul ; Rao, C. N. R. ; Fuertes, Amparo (2014) Synthesis, anion order and magnetic properties of RVO3−xNx perovskites (R = La, Pr, Nd; 0 ≤ x ≤ 1) Journal of Materials Chemistry C, 2 (12). p. 2212. ISSN 2050-7526

Full text not available from this repository.

Official URL: http://doi.org/10.1039/C3TC32362E

Related URL: http://dx.doi.org/10.1039/C3TC32362E

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.

Item Type:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:120019
Deposited On:21 Jun 2021 13:53
Last Modified:22 Sep 2021 10:24

Repository Staff Only: item control page