4.6 Article

Rare earth niobium oxynitrides, LnNbON2-δ (Ln = Y, La, Pr, Nd, Gd, Dy): Synthesis, structure and properties

Journal

MATERIALS RESEARCH BULLETIN
Volume 46, Issue 11, Pages 2021-2024

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2011.07.009

Keywords

Inorganic compounds; Infrared spectroscopy; X-ray diffraction; Magnetic properties

Funding

  1. MICINN (Spanish Ministry of Science and Innovation)/DST (Indian Department of Science and Technology)

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Ammonolysis of rare earth niobates of the type LnNbO(4) (Ln = Y, La, Pr, Nd, Gd, Dy) yields oxynitrides of different structures. When Ln = La, Nd and Pr, the structure is that of an orthorhombic perovskite of the general formula LnNbON(2). As the size of the rare earth decreases, the oxynitride has a nitrogen-deficient defect fluorite (Ln = Pr, Nd, Gd), or pyrochlore (Ln = Y) structure. The IR spectra of the oxynitrides and the corresponding oxides are significantly different. Thermogravimetric analysis suggests the formation of an intermediate phase wherein the N-2 molecule is attached to the oxide lattice above 400 degrees C and decomposes to give the oxide on heating in an oxygen atmosphere. Raman spectra of the intermediate phases show evidence for the N N stretching vibration. Gadolinium niobium oxynitride is found to be paramagnetic. (C) 2011 Elsevier Ltd. All rights reserved.

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