Mechanosynthesis of YIG and GdIG: A Structural and Mössbauer Study |
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Authors: | A Paesano Jr S C Zanatta S N De Medeiros L F CÓtica J B M Da Cunha |
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Institution: | (1) Departamento de Física, Universidade Estadual de Maringá, Av. Colombo 5790, CEP 87020-900 Maringá, PR, Brazil;(2) Instituto de Física, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil |
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Abstract: | We have investigated the mechanosynthesis of gadolinium and yttrium iron garnets by high-energy ball-milling of α-Fe2O3 and Gd2O3 or α-Fe2O3 and Y2O3, respectively, followed by short thermal annealings conducted at moderate temperatures. The samples were characterized by X-ray diffraction and Mössbauer spectroscopy, in order to determine the influence of the milling time and annealing conditions on the final products. For as-milled samples of each rare-earth system, the results revealed the formation of perovskite phases, in relative amounts that depend on the milling time. The formation of garnet phases was observed in as-annealed samples treated at 1000°C for 2 h or 1100°C for 3 h, i.e., at very modest annealing requirements when compared with ordinary solid-state-reaction processes performed without previous high-energy milling. Also, the occurrence was verified of a milling time for which the relative amount of garnet phases formed by annealing was maximized. This time depends on the rare-earth composing the garnet phase and on the annealing temperature. |
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Keywords: | gadolinium-iron garnet (GdIG) high-energy ball-milling M?ssbauer spectroscopy yttrium-iron garnet (YIG) |
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