Studies on the formation of yttrium iron garnet (YIG) through stoichiometry modification prepared by conventional solid-state method

Ali, Wan Fahmin Faiz Wan; Othman, M.H; Ain, Mohd Fadzil; Abdullah, Norazharuddin Shah; Ahmad, Zainal Arifin

doi:10.1016/j.jeurceramsoc.2012.12.016

Cited by 43 publications

(18 citation statements)

References 27 publications

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“…At this point, the GBH model appears to fit the YIG formation kinetics more compared to the Jander's model, based on two reasons. Firstly, the Jander model ascribed that the reaction 13,15 including ours, that the YIG formation is not a single step reaction. Relying on these findings, ZLT is suggested to be unsuitable to represent the reactions in the formation YIG ceramics.…”

Section: Resultsmentioning

confidence: 89%

“…11 Presence of the secondary phases such as YIP would contribute to higher loss (electromagnetically) since YIP is an antiferromagnetic material, in contrast with YIG, which is a ferrimagnetic material. 12,13 Therefore, it is important to understand the kinetics and mechanism of the phase formation in YIG ceramics when optimizing the solid-state process, so that the presence of the unwanted phase(s) can be prevented. Regrettably, the formation mechanism and reaction kinetic of YIG ceramics have not being discussed comprehensively in the literature.…”

Section: Introductionmentioning

confidence: 99%

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The Investigation of the Phenomenological YIG Phase Formation Within 1000°C to 1250°C: A Kinetic Approach

et al. 2015

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Presence of unwanted phase(s) such as yttrium iron perovskite (YIP) in yttrium iron garnet (YIG) ceramics has limited the utilization of YIG in the wireless communication domain. These unwanted phase(s) have been deemed responsible for the high dielectric losses, thus contributing to poor performance. This paper focuses on understanding the phenomenological phase transformation during the conventional solid state synthesis of YIG. This is done in order to monitor conditions which favor formation of unwanted phase(s), which shall later be reduced. The phase changes during YIG formation as a function of reaction times and temperatures were determined through XRD analysis. The amounts of YIG formed at various reaction times were fitted into various kinetic models in order to mathematically link what occurs experimentally to the available theoretical descriptions of reactions. It is found that the Ginstling‐Brounstein‐Habert (GBH) model exhibited good mathematical correlation to the formation of YIG. Meanwhile the activation energy (Ea) indicated 490 kJ/mol is required for the formation of YIG. At the end, a reaction model and mechanism between Fe2O3 and Y2O3 were established and illustrated to underline the effect of diffusion controlled environment on the formation of phases in YIG ceramics.

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Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

The Investigation of the Phenomenological YIG Phase Formation Within 1000°C to 1250°C: A Kinetic Approach

et al. 2015

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“…The calculated activation energy (E a ) at this temperature (600 kJ/mol À1 ) caused both Fe 2+ and Fe 3+ cations to migrate and diffuse into the octahedral and tetrahedral of garnet crystal structure [28] while the other metal ions, Y 3+ , would diffuse into a dodecahedral site. However, the movement of Fe cations is believed to be faster than Y 3+ , since the Fe cations were smaller in atomic radii and ionic density [13]. A smaller and lighter ionic element would increase ionic mobility, thereby causing faster diffusion.…”

Section: Statistical Approach In Optimizing Yig's Puritymentioning

confidence: 99%

“…The most important approach in producing high-purity YIG is the modification of the reactant stoichiometry. Our previous work [13] indicated that the addition of 8 wt% Fe 2 O 3 in the standard ratio of YIG stoichiometry caused the presence of about 96% of garnet phases in the final product. YIG with high-purity could also be attained by modifying the particle size of the starting materials.…”

Section: Introductionmentioning

confidence: 99%

From optimization to dielectric resonator antenna (DRA) application of YIG: Synthesis approach

Ali

Othman

Ain

et al. 2015

Journal of Alloys and Compounds

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“…By adding excess 8-10 wt% Fe 2 O 3 , 99% of YIG ceramic phase was achieved. What's more, YIG with properly excess Fe 2 O 3 could be used for high frequency tunable dielectric resonator antenna (DRA) [13,14]. Recently, YIG ceramics with about 98-99% of theoretical density were fabricated by solid-state reaction method [15,16].…”

Section: Introductionmentioning

confidence: 99%

Studies on Highly Dense Pure YIG Polycrystalline Ceramics Fabricated by Tape-casting Method

Zhao

Shen

et al. 2020

Preprint

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Pure phase Y3Fe5O12 (YIG) ceramics was successfully produced by tape-casting forming process and one-step solid-state reaction method. With the sintering temperature above 1100 ºC, the pure phase YIG ceramics was synthesized with no YIP or Fe2O3 phase in XRD patterns. YIG ceramic sintering at 1400 ºC for 10 h showed a clear grain structure with an obvious grain boundary, and no pores were observed in the SEM images. YIG ceramics in this paper has a high relative density which was 99.8% and the saturation magnetization was 28.2 emu/g at room temperature. The hysteresis loss at temperatures of 230-360 K was smaller than 10 mJ/kg. The tan Se was nearly zero at 6~7 GHz and 11~12 GHz, showing that it can be used as a good material for microwave applications. In addition, the low values of tan and tan indicates that it may have a good electromagnetic wave absorption ability.

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Studies on the formation of yttrium iron garnet (YIG) through stoichiometry modification prepared by conventional solid-state method

Cited by 43 publications

References 27 publications

The Investigation of the Phenomenological YIG Phase Formation Within 1000°C to 1250°C: A Kinetic Approach

The Investigation of the Phenomenological YIG Phase Formation Within 1000°C to 1250°C: A Kinetic Approach

From optimization to dielectric resonator antenna (DRA) application of YIG: Synthesis approach

Studies on Highly Dense Pure YIG Polycrystalline Ceramics Fabricated by Tape-casting Method

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