Synthesis of mono and multidomain YIG particles by chemical coprecipitation or ceramic procedure
Autor: | Marta Suárez, Jose Menendez, Lucía Fernández-García |
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Přispěvatelé: | Ministerio de Educación y Ciencia (España), European Commission, Consejo Superior de Investigaciones Científicas (España) |
Rok vydání: | 2010 |
Předmět: |
Ceramics
Saturation magnetization Materials science Coprecipitation Inorganic chemistry Yttrium iron garnet Oxides mixture Crystal structure law.invention chemistry.chemical_compound symbols.namesake law Ferromagnetic garnets Differential thermal analysis Materials Chemistry Calcination Chemical synthesis Ceramic Mechanical Engineering Metals and Alloys Microstructure chemistry Mechanics of Materials visual_art visual_art.visual_art_medium symbols Raman spectroscopy |
Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
ISSN: | 0925-8388 |
Popis: | 4 páginas, 3 figuras. Yttrium iron garnet powders have been synthesized by chemical coprecipitation using two different precursors, nitrates and chlorides, and by an oxides mixture route. It is shown that depending on the precursors and synthesis conditions used pure yttrium iron garnet powders can be obtained with a mono or multidomain magnetic behaviour. The yttrium iron garnet crystalline structure, as studied by Raman spectroscopy, was already formed after calcination at temperatures as low as 800 °C when the nitrate precursors were used. However, calcination temperatures of up to 1100 °C were required to obtain yttrium iron garnet powders when the precursors were chlorides or when the oxides mixture route was chosen. The saturation magnetization of the powders correlates well with the structural characterization: when nitrate precursors were used, the saturation magnetization was already close to the bulk value, 26.8 emu/cm3, after calcination at 800 °C. However, the saturation magnetization of the powders obtained by the chlorides and oxides mixture routes was close to zero up to calcination temperatures of 1100 °C. Finally, both the chlorides and the oxides mixture routes yield multidomain micron sized yttrium iron garnet powders, whereas the nitrates route led to monodomain submicron sized powders. The authors want to acknowledge the Spanish Ministry of Education and Science and UE for funding through project MAT2009-14534-C03-03. One of us, L. Fernandez-Garcia, wants to acknowledge JAE program for PhD grant. |
Databáze: | OpenAIRE |
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