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Synthesis of coral-shaped yttrium-aluminium-iron garnets by solution-combustion method

Anupama, AV and Kumar, Rajeev and Choudhary, Harish Kumar and Sahoo, Balaram (2018) Synthesis of coral-shaped yttrium-aluminium-iron garnets by solution-combustion method. In: CERAMICS INTERNATIONAL, 44 (3). pp. 3024-3031.

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Official URL: http://dx.doi.org/10.1016/j.ceramint.2017.11.059

Abstract

Aluminium substituted yttrium-iron garnet (Y3AlxFe5-xO12, x = 0, 1, 2, 3, 4 and 5) powders were synthesized by solution combustion route followed by calcination at 1000 degrees C for 6 h. According to the X-ray diffraction (XRD) results, the as-prepared samples were amorphous. Calcination of the samples at 1000 degrees C for 6 h results in the formation of phase pure (Ia<(3)overbar>d) garnet structure. The morphology of the samples (for all compositions) were found to be coral-network-like. The Rietveld refinement of the XRD patterns and the Mossbauer spectroscopy confirmed that Y3+ ions occupy the dodecahedral site, whereas Al3+ and Fe3+ ions are distributed in the tetrahedral and octahedral sites of the bcc (Ia (3) over bard) structure of the garnet phase. The Al3+ ions have a preference to occupy the octahedral site. The lattice parameter decreases with increase in Al-content due to the small size of the Al3+ cations. For the yttrium-iron-garnet (YIG) sample (x = 0), a saturation magnetization (Ms) value of 29 emu/g was obtained, which decreases to 7 emu/g for the sample with x = 2. Further addition of Al makes the garnets paramagnetic. The coral network shape of our garnet samples renders them useful for various applications in catalysis.

Item Type: Journal Article
Additional Information: Copy right for the article belong to ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 19 Mar 2018 18:28
Last Modified: 21 Feb 2019 09:40
URI: http://eprints.iisc.ac.in/id/eprint/59248

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