Thermodynamic Modeling of the SFCA Phase Ca&lt;sub&gt;2&lt;/sub&gt;(Fe, Ca)&lt;sub&gt;6&lt;/sub&gt;(Fe, Al, Si)&lt;sub&gt;6&lt;/sub&gt;O&lt;sub&gt;20&lt;/sub&gt;

玲子, 村尾; 貴幸, 原野; 正雄, 木村; Jung, In‐Ho

doi:10.2355/tetsutohagane.tetsu-2018-139

Cited by 3 publications

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References 16 publications

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“…Calcium ferrite (CaFe 2 O 4 ) is a member of the ferrite family and a widely used material in optical applications because of its unique properties [26]. This compound has a spinel structure, where the Ca 2+ ions occupy tetrahedral sites and the Fe 3+ ions occupy octahedral sites [27]. The important properties of calcium ferrite make it suitable for optical applications.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Optical Properties of PVDF-CaFe2O4 Polymer Nanocomposite Films

Alhassan

Alshammari

et al. 2023

Polymers

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In this work, a synthesis technique for highly homogeneous PVDF-CaFe2O4 polymer films direct from solution was developed. The structural characterizations were conducted using XRD, FTIR, and ESEM experimental techniques. The XRD characteristic peaks of CaFe2O4 nanoparticles revealed a polycrystalline structure. The average crystallite size for CaFe2O4 was calculated to be 17.0 nm. ESEM micrographs of PVDF nanocomposites containing 0.0, 0.25, 0.75, and 1.0 wt% of CaFe2O4 showed smooth surface topography. The direct Edir and indirect Eind band gap energies for the PVDF-CaFe2O4 nanocomposites were decreased with the additions of 0.0–1.0 wt% CaFe2O4. In addition, the refractive index (n0) increased from 3.38 to 10.36, and energy gaps (Eg) decreased from 5.50 to 4.95 eV. The nonlinear refractive index (n2) for the PVDF-CaFe2O4 nanocomposites was improved with the addition of CaFe2O4 nanoparticles, exceeding those reported in the literature for PVC, PVA, and PMMA nanocomposites. Therefore, the PVDF-CaFe2O4 nanocomposites are expected to take the lead in optoelectronic applications because of their unusual optical properties.

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Section: Introductionmentioning

confidence: 99%

Preparation and Optical Properties of PVDF-CaFe2O4 Polymer Nanocomposite Films

Alhassan

Alshammari

et al. 2023

Polymers

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Effects of Liquidus Temperature and Liquid Amount on the Fluidity of Bonding Phase and Strength of Sinter

et al. 2021

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2CaO·SiO2と鉄鉱石間の反応に及ぼすAl2O3添加の影響

Shimizu

Iwami²,

Higuchi³

et al. 2023

Tetsu-to-Hagane

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The effect of Al2O3 addition on the reaction between 2CaO•SiO2 (C2S) and iron ore has been elucidated from the perspective of silico-ferrite of calcium and aluminum (SFCA) formation.Hematite iron ore, synthesized C2S, and reagent grade CaO, Al2O3, and SiO2 were mixed so that the Fe2O3/SiO2 (mass%) ratio was 14.43. The mixed powders were uniaxially pressed into the shape of a tablet, which was sintered in air at 1250 o C for 5 min. The constituent phases were investigated using XRD and EPMA for the samples where CaO/SiO2 (mass%) ratio was varied from 0.22 to 2.60 and for the samples where Al2O3 concentration was varied from 1.44 mass% (T1) to 3.98 mass% (T2). (i) The constituent phases are mainly Fe2O3 and SiO2 for the samples with a CaO/SiO2 (mass%) ratio of 0.22, and Fe2O3, SiO2, and SFCA for the samples with ratios above 1.97. (ii) The compositions of the SFCA phases are all on the plane connecting CaFe6O10, CaAl6O10 and Ca4Si3O10. The Al2O3 concentrations of SFCA in the T1 and T2 samples are in the range of 1-5 mass% and 2-8 mass%, respectively, and the Fe2O3 concentration tends to decrease with increasing Al2O3 concentration. (iii) The Rietveld analyses of XRD profiles have revealed that adding CaO and Al2O3 increases the fraction of the SFCA phase in the sintered sample. Hence, it is suggested that the placement of CaO and Al2O3 near C2S would promote SFCA formation, which leads to mitigating the decrease in strength relevant to C2S-added iron ore sinters.

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Thermodynamic Modeling of the SFCA Phase Ca<sub>2</sub>(Fe, Ca)<sub>6</sub>(Fe, Al, Si)<sub>6</sub>O<sub>20</sub>

Cited by 3 publications

References 16 publications

Preparation and Optical Properties of PVDF-CaFe2O4 Polymer Nanocomposite Films

Preparation and Optical Properties of PVDF-CaFe2O4 Polymer Nanocomposite Films

Effects of Liquidus Temperature and Liquid Amount on the Fluidity of Bonding Phase and Strength of Sinter

2CaO·SiO<sub>2</sub>と鉄鉱石間の反応に及ぼすAl<sub>2</sub>O<sub>3</sub>添加の影響

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