Formation mechanism of nano-crystalline β-Fe<sub>2</sub>O<sub>3</sub>particles with bixbyite structure and their magnetic properties

Danno, Teruaki; Asaoka, Hiroshi; Nakanishi, Makoto; Fujii, Toru; Ikeda, Yûji; Kusano, Yoshihiro; Takada, Jun

doi:10.1088/1742-6596/200/8/082003

Cited by 19 publications

(12 citation statements)

References 9 publications

(18 reference statements)

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“…In this study, β-Fe 2 O 3 powder was synthesized by calcining the mixture of NaFe(SO 4 ) 2 (or 1.5% ZrSO 4 doped NaFe(SO 4 ) 2 ) and NaCl in a muffle furnace at 450°C for 1 h [ 43 ]. As-prepared β-Fe 2 O 3 powder was then deposited on fluorine-doped tin oxide (FTO) glass by electrophoretic deposition to prepare the particle-assembled films.…”

Section: Methodsmentioning

confidence: 99%

Paving the road toward the use of β-Fe2O3 in solar water splitting: Raman identification, phase transformation and strategies for phase stabilization

Zhang

Wang

Feng

et al. 2020

National Science Review

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Although β-Fe2O3 has a high theoretical solar-to-hydrogen efficiency because of its narrow band gap, the study of β-Fe2O3 photoanodes for water splitting is elusive as a result of their metastable nature. Raman identification of β-Fe2O3 is theoretically and experimentally investigated in this study for the first time, thus clarifying the debate about its Raman spectrum in the literature. Phase transformation of β-Fe2O3 to α-Fe2O3 was found to potentially take place under laser and electron irradiation as well as annealing. Herein, phase transformation of β-Fe2O3 to α-Fe2O3 was inhibited by introduction of Zr doping, and β-Fe2O3 was found to withstand a higher annealing temperature without any phase transformation. The solar water splitting photocurrent of the Zr-doped β-Fe2O3 photoanode was increased by 500% compared to that of the pure β-Fe2O3 photoanode. Additionally, Zr-doped β-Fe2O3 exhibited very good stability during the process of solar water splitting. These results indicate that by improving its thermal stability, metastable β-Fe2O3 film is a promising photoanode for solar water splitting.

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Section: Methodsmentioning

confidence: 99%

Paving the road toward the use of β-Fe2O3 in solar water splitting: Raman identification, phase transformation and strategies for phase stabilization

Zhang

Wang

Feng

et al. 2020

National Science Review

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“…The cubic unit contains 24 Fe(III) ions with C 2 symmetry and 8 Fe(III) ions with C 3i symmetry. 57 The selective formation of b-Fe 2 O 3 The system surface morphology, analyzed by AFM (Fig. 6), was characterised by the presence of pyramidal aggregates with average lateral dimensions of about 100 nm.…”

Section: Thermal Cvd Of Fe 2 O 3 Nanostructuresmentioning

confidence: 99%

β-Fe₂O₃nanomaterials from an iron(ii) diketonate-diamine complex: a study from molecular precursor to growth process

et al. 2012

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Iron oxide is a key multi-functional material in many different fields of modern technology. The β-Fe(2)O(3) cubic phase, one of the least studied Fe-O systems, was obtained by Chemical Vapor Deposition (CVD) using for the first time a Fe(II) β-diketonate diamine complex, Fe(hfa)(2)·TMEDA, as the molecular source (hfa = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionate; TMEDA = N,N,N',N'-tetramethylethylenediamine). The strong visible light absorption of β-Fe(2)O(3) deposits highlights their possible functional application in photocatalytic hydrogen production under solar light. A comprehensive investigation on the Fe(ii) complex, performed by a joint experimental-theoretical approach, explains the molecular origin of its excellent thermal behaviour and reveals why this species is a successful precursor for the CVD of iron oxide nanostructures.

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“…The first one major endothermic effect with minimum at 354 °C and the following endothermic peak with minimum at 426 °C are connected with the reduction of Pr6O11 (a dual oxide 4PrO2•Pr2O3) to the Pr2O3 [37] and successive losses of oxygen in the Pr6O11 lattice. In the DTA curve, there is a slight decline indicating an endothermic effect at a temperature about 493 °C and it can be assigned to the phase transition of Fe2O3 from β into  -form [38,40,41]. Subsequent endothermic effect with minimum 644 °C corresponds not only to phase transformation of a monoclinic -Bi2O3 to a cubic modification δ-Bi2O3 [36,39,42], but also to another partial reduction of praseodymium oxide [37,38,43].…”

Section: Resultsmentioning

confidence: 96%

The effect of partial substitution of Bi on colour properties and thermal stability of BixPr1−xFeO3 pigments

Luxová

Šulcová

2019

J Therm Anal Calorim

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The samples of BixPr1-xFeO3 (x=0-0.3) were prepared by conventional ceramic method. The main aim of this work was to focus on determination of influence of partial Bi substitution for Pr on chromaticity and thermal stability. The formation temperature of the orthoferrites was chosen according to the results of DTA/TG analysis. X-ray powder diffraction analysis showed that solid solutions with orthorhombic structure were created. Results of the work proved that Bi substitution for Pr in PrFeO3 has significantly impact on colour properties and thermal stability. Start of sintering of PrFeO3 was detected at 1086 °C and due to substitution of Bi 3+ decreased to 956 °C (for x = 0.3). Thermal stability of the samples with x = 0.2 and x = 0.3 was limited at 1371 °C, 1360 °C respectively. However, final colour was positively affected by the addition of Bi 3+ . Colour shades of powders shifted from yellowish brown to reddish brown with increasing amount of Bi ions. Very interesting colours of different deep yellowish and reddish brown shades were obtained after their application into organic binder. Mean particle size for all milled compounds prepared at 1000 °C was around 1 m and for samples calcined at 1100 °C ranged between 1 -1.6 m.

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Formation mechanism of nano-crystalline β-Fe₂O₃particles with bixbyite structure and their magnetic properties

Cited by 19 publications

References 9 publications

Paving the road toward the use of β-Fe2O3 in solar water splitting: Raman identification, phase transformation and strategies for phase stabilization

Paving the road toward the use of β-Fe2O3 in solar water splitting: Raman identification, phase transformation and strategies for phase stabilization

β-Fe₂O₃nanomaterials from an iron(ii) diketonate-diamine complex: a study from molecular precursor to growth process

The effect of partial substitution of Bi on colour properties and thermal stability of BixPr1−xFeO3 pigments

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Formation mechanism of nano-crystalline β-Fe2O3particles with bixbyite structure and their magnetic properties

Cited by 19 publications

References 9 publications

Paving the road toward the use of β-Fe2O3 in solar water splitting: Raman identification, phase transformation and strategies for phase stabilization

Paving the road toward the use of β-Fe2O3 in solar water splitting: Raman identification, phase transformation and strategies for phase stabilization

β-Fe2O3nanomaterials from an iron(ii) diketonate-diamine complex: a study from molecular precursor to growth process

The effect of partial substitution of Bi on colour properties and thermal stability of BixPr1−xFeO3 pigments

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Product

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Formation mechanism of nano-crystalline β-Fe₂O₃particles with bixbyite structure and their magnetic properties

β-Fe₂O₃nanomaterials from an iron(ii) diketonate-diamine complex: a study from molecular precursor to growth process