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Structural and magnetic properties of yttrium aluminum iron garnet (YAlG) nanoferrite prepared via auto-combustion sol–gel synthesis

Structural and magnetic properties of yttrium aluminum iron garnet (YAlG) nanoferrite prepared... This research investigated the structural, microstructural, and magnetic properties of yttrium aluminum iron garnet (Y3Al x Fe5-x O12, YAIG) (x = 0.4, 0.8, 1.2, 1.6, 2.0, 2.4, and 2.8). The samples were prepared via auto-combustion sol–gel technique, using citric acid as chelating agent and fuel for the combustion process. The obtained powder was heated at 950 °C, and part of it was pressed into pellet and sintered at 1200 °C. The garnet phase formation was studied by X-ray diffraction, using the powder samples. Lattice constant of the samples was found to decrease from 12.4672 to 12.2540 Å as Al increase from x = 0.4 to 2.8. The garnet structure was confirmed by FTIR, where the main vibrating modes were observed to shift to higher wave number with increasing Al concentration. Saturation magnetization, M s., shows a decreasing trend from 10.0450 to 0.1887 emu/g with increasing Al from 0.4 to 2.8. The decreasing trend in the static magnetic properties of YAIG samples is attributed to the introduction of Al ions in the YIG crystal lattice. High Al content of the samples changed their property from ferrimagnetic to paramagnetic at x > 1.6. The grain size decreased from 0.46 to 0.27 μm, as Al increased from x = 0.4 to 2.8. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Australian Ceramic Society Springer Journals

Structural and magnetic properties of yttrium aluminum iron garnet (YAlG) nanoferrite prepared via auto-combustion sol–gel synthesis

Structural and magnetic properties of yttrium aluminum iron garnet (YAlG) nanoferrite prepared via auto-combustion sol–gel synthesis

J Aust Ceram Soc (2018) 54:55–63 DOI 10.1007/s41779-017-0126-7 RESEARCH Structural and magnetic properties of yttrium aluminum iron garnet (YAlG) nanoferrite prepared via auto-combustion sol–gel synthesis 1,2 1,3 1 Makiyyu Abdullahi Musa & Raba’ah Syahidah Azis & Nurul Huda Osman & 1,3 1 Jumiah Hassan & Mustafa Mousa Dihom Received: 7 June 2017 /Revised: 20 July 2017 /Accepted: 6 September 2017 /Published online: 16 September 2017 Australian Ceramic Society 2017 Abstract This research investigated the structural, micro- Introduction structural, and magnetic properties of yttrium aluminum iron garnet (Y Al Fe O ,YAIG) (x = 0.4, 0.8, 1.2, 1.6, 2.0, 2.4, Yttrium iron garnet (YIG, Y Al Fe O ) is a ferrite material 3 x 5-x 12 3 x 5-x 12 and 2.8). The samples were prepared via auto-combustion that has been attracting research interests due to its excellent sol–gel technique, using citric acid as chelating agent and fuel magnetic and magnetoelectric properties that suit various ap- for the combustion process. The obtained powder was heated plications in optical devices and microwave communication at 950 °C, and part of it was pressed into pellet and sintered at components [1, 5]. It was reported to be the best magnetic 1200 °C. The garnet phase formation was studied by X-ray material for high-frequency applications [18] due to its high diffraction, using the powder samples. Lattice constant of the electric resistivity [31], high radiation stability [10], compar- samples was found to decrease from 12.4672 to 12.2540 Å as atively low magnetization [7], narrowest ferromagnetic line Al increase from x = 0.4 to 2.8. The garnet structure was width, and consequent low loss [24]. The cubic crystal struc- confirmed by FTIR, where the main vibrating modes were ture in YIG has a general formula A B O .Therearethree 3 5 12 observed to shift to higher wave number with increasing Al sub-lattices in the garnet structure: the...
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Publisher
Springer Journals
Copyright
Copyright © 2017 by Australian Ceramic Society
Subject
Materials Science; Ceramics, Glass, Composites, Natural Materials; Materials Engineering; Inorganic Chemistry
ISSN
2510-1560
eISSN
2510-1579
DOI
10.1007/s41779-017-0126-7
Publisher site
See Article on Publisher Site

Abstract

This research investigated the structural, microstructural, and magnetic properties of yttrium aluminum iron garnet (Y3Al x Fe5-x O12, YAIG) (x = 0.4, 0.8, 1.2, 1.6, 2.0, 2.4, and 2.8). The samples were prepared via auto-combustion sol–gel technique, using citric acid as chelating agent and fuel for the combustion process. The obtained powder was heated at 950 °C, and part of it was pressed into pellet and sintered at 1200 °C. The garnet phase formation was studied by X-ray diffraction, using the powder samples. Lattice constant of the samples was found to decrease from 12.4672 to 12.2540 Å as Al increase from x = 0.4 to 2.8. The garnet structure was confirmed by FTIR, where the main vibrating modes were observed to shift to higher wave number with increasing Al concentration. Saturation magnetization, M s., shows a decreasing trend from 10.0450 to 0.1887 emu/g with increasing Al from 0.4 to 2.8. The decreasing trend in the static magnetic properties of YAIG samples is attributed to the introduction of Al ions in the YIG crystal lattice. High Al content of the samples changed their property from ferrimagnetic to paramagnetic at x > 1.6. The grain size decreased from 0.46 to 0.27 μm, as Al increased from x = 0.4 to 2.8.

Journal

Journal of the Australian Ceramic SocietySpringer Journals

Published: Sep 16, 2017

References