Investigation of garnet formation by sintering of Y2O3 and Fe2O3

Sztaniszláv, A.; Sterk, E.; Fetter, Linus A.; Farkas-Jahnke, M.; Lábár, János L.

doi:10.1016/0304-8853(84)90141-0

Cited by 44 publications

(24 citation statements)

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“…This explains why in Ref. [10] the temperature required to obtain pure YIG goes up to 1200 • C and 2 h holding time and, in general, the scattering of data in literature [12][13][14][15][16][17][18][19]. Also, differences in the pH used during the synthesis may account for the different phases found at the different calcination temperatures.…”

Section: Resultsmentioning

confidence: 98%

“…However, production of YIG following this process is extremely dependent on the precursors used, particularly on their granulometry, and high calcination temperatures must be used in order to obtain pure YIG powders. Calcination temperatures between 600 and 1200 • C have been reported [12,13]. Some magnetic properties such as coercive field and initial permeability are strongly depen-0925-8388/$ -see front matter © 2010 Elsevier B.V. All rights reserved.…”

Section: Introductionmentioning

confidence: 97%

“…[9][10][11]. The most common way to produce Y 3 Fe 5 O 12 is the oxides mixture [12][13][14]. However, production of YIG following this process is extremely dependent on the precursors used, particularly on their granulometry, and high calcination temperatures must be used in order to obtain pure YIG powders.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of mono and multidomain YIG particles by chemical coprecipitation or ceramic procedure

Fernández-García

Suárez

Menéndez

2010

Journal of Alloys and Compounds

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a b s t r a c tYttrium 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/cm 3 , 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.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 97%

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Synthesis of mono and multidomain YIG particles by chemical coprecipitation or ceramic procedure

Fernández-García

Suárez

Menéndez

2010

Journal of Alloys and Compounds

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“…2(a)) shows the formation of some orthorhombic YIG, but this calcination temperature was not enough to generate mixed terbium-yttrium-iron garnet (TbYIG); thus, sintering must be done at higher temperatures and/or for longer time durations [27]. Rodic et al [21], for instance, used 6 h presintering at 1127 • C for GdIG and TbIG, while Sztaniszlav et al [28] pre-sintered an yttria-hematite mixture for 3-12 h in air at 800-1400 • C to obtain YIG and found a maximum predominance of YFeO 3 at 1100 • C, while YIG formed only above 1300 • C; Ings et al [29], got success at 1300 • C. Hong et al [25] achieved lattice constant equal to 12.4364Å for TbIG synthesized by using citrate process, in which the dried gel powder was ground and annealed at 1400 • C for 3 h in air. The VSM measurements were performed in the 30-700 K temperature range, covering both the Néel temperature (T N = 560 ± 5 K) and the compensation temperature (T compensation = 260 ± 5 K).…”

Section: Resultsmentioning

confidence: 96%

Terbium–yttrium–iron garnet revisited

Marins

Ogasawara

Ogasawara³

2007

Journal of Alloys and Compounds

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“…This is due in part to the fact that orthorhombic yttrium orthoferrite, o-YFeO 3 , is formed as an intermediate during conventional solid-state reaction. [18] Therefore, temperatures well above 1000 °C are typically required to obtain single phase material. [19,20] However, prolonged annealing at such high temperatures leads to microcrystalline YIG.…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Magnetic Rare-Earth Iron Garnet Thin Films with Ordered Mesoporous Structure

et al. 2013

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Amphiphilic polymers are very attractive as porogens for the preparation of ordered mesoporous thin films and powders with pore sizes ranging from 40 down to a few nanometers in diameter because they are capable of both forming different superstructures and interacting with sol-gel precursors. In the present work, we report for the first time the synthesis of a series of highly crystalline rare-earth iron garnet (RE 3 Fe 5 O 12 , RE = Y, Gd-Dy) thin films with cubic networks of interconnected pores averaging 17 nm in diameter through facile polymer templating of hydrated nitrate salts. Despite intricate crystallization pathways, e.g., Y 3 Fe 5 O 12 via Y 4 Fe 2 O 9 and h-YFeO 3 , the nanoscale architecture of all these materials is only affected to a limited extent by solid-solid conversions at elevated temperatures.We specifically focus on the characterization of the morphology, microstructure and magnetic properties of polymer-templated Y 3 Fe 5 O 12 . This novel mesoporous material is single phase after heating to 900 °C, free of major structural defects and is also well-defined on the atomic level, as evidenced by a combination of in situ and ex situ scattering/diffraction techniques, electron microscopy, Raman and X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry. The high quality of the nanocrystalline Y 3 Fe 5 O 12 thin films with overall soft magnetic-like characteristics and moderate anisotropy is further confirmed by SQUID magnetometry measurements. The magnetization behavior in the temperature range 5-380 K well describes Bloch's T 3/2 law for a 3D Heisenberg-type ferromagnet.

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Investigation of garnet formation by sintering of Y2O3 and Fe2O3

Cited by 44 publications

References 1 publication

Synthesis of mono and multidomain YIG particles by chemical coprecipitation or ceramic procedure

Synthesis of mono and multidomain YIG particles by chemical coprecipitation or ceramic procedure

Terbium–yttrium–iron garnet revisited

Room Temperature Magnetic Rare-Earth Iron Garnet Thin Films with Ordered Mesoporous Structure

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