Synthesis and characterization of non-stoichiometric LaFeO3 perovskite

Delmastro, A.; Mazza, Daniele; Ronchetti, Silvia Maria; Vallino, M.; Spinicci, R.; Brovetto, P.; Salis, M.

doi:10.1016/s0921-5107(00)00570-5

Cited by 101 publications

(54 citation statements)

References 9 publications

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“…A line at 645 cm −1 in ErFeO 3 was considered as impurity-related phonon, [10] while a line at 654 cm −1 in LuFeO 3 was assigned to two-phonon scattering. [9] To our knowledge, we tend to deduce that the mode around 620 cm −1 is assigned to two-phonon scattering rather than related to impurity, because it commonly appears in NdFeO 3 and GdFeO 3 , even in YFeO 3 single crystal which is beyond the scope of this work. The rest of the lines are believed to belong to one-phonon scatterings.…”

Section: Resultsmentioning

confidence: 89%

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Preparation of ReFeO₃ nanocrystalline powders by auto‐combustion of citric acid gel

Cheng

Shen

et al. 2009

Asia-Pacific J Chem Eng

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Autocombustion of citric acid gel was employed to prepare ReFeO 3 (Re = Gd, Nd) nanocrystalline powders. The phase identification and lattice parameters were investigated by the X-ray diffraction (XRD). Fieldemission scanning electron microscopy (FESEM) investigations were carried out to examine the morphology and average size of these powders. Several one phonon lines, two-magnon excitation, and two-phonon scattering have been assigned in their Raman spectra. Both NdFeO 3 and GdFeO 3 nanocrystalline powders were single ReFeO 3 phase, which are agglomerated with average crystallite size of 70-90 nm. The investigations indicated that the autocombustion of citric acid gel method is an effective technology to prepare ReFeO 3 nanocrystalline powders. 

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Section: Resultsmentioning

confidence: 89%

“…The crystallite sizes were calculated to be about 73 and 68 nm for NdFeO 3 and GdFeO 3 powder calcined at 800…”

Section: Resultsmentioning

confidence: 99%

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Preparation of ReFeO₃ nanocrystalline powders by auto‐combustion of citric acid gel

Cheng

Shen

et al. 2009

Asia-Pacific J Chem Eng

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“…The oxygen non-stoichiometry effect was common when the nanoparticles were prepared using auto-combustion, thermal-decomposition, citrate pyrolysis, solid state reaction and Pechini methods [32,[47][48][49]. Delmastro et al [50] showed that a series of these perovskite structures (including LaFeO3 and La0.7FeO2.55) demonstrated identical XRD patterns. Therefore, we used the term of LaFeO3 to present actual perovskite nanostructure in this manuscript.…”

Section: Physicochemical Characterization Of Nanoparticlesmentioning

confidence: 99%

Surfactant-Assisted Perovskite Nanofillers Incorporated in Quaternized Poly (Vinyl Alcohol) Composite Membrane as an Effective Hydroxide-Conducting Electrolyte

Kumar

et al. 2017

Energies

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Perovskite LaFeO 3 nanofillers (0.1%) are incorporated into a quaternized poly(vinyl alcohol) (QPVA) matrix for use as hydroxide-conducting membranes in direct alkaline methanol fuel cells (DAMFCs). The as-synthesized LaFeO 3 nanofillers are amorphous and functionalized with cetyltrimethylammonium bromide (CTAB) surfactant. The annealed LaFeO 3 nanofillers are crystalline without CTAB. The QPVA/CTAB-coated LaFeO 3 composite membrane shows a defect-free structure while the QPVA/annealed LaFeO 3 film has voids at the interfaces between the soft polymer and rigid nanofillers. The QPVA/CTAB-coated LaFeO 3 composite has lower methanol permeability and higher ionic conductivity than the pure QPVA and QPVA/annealed LaFeO 3 films. We suggest that the CTAB-coated LaFeO 3 provides three functions to the polymeric composite: increasing polymer free volume, ammonium group contributor, and plasticizer to enhance the interfacial compatibility. The composite containing CTAB-coated LaFeO 3 results in superior cell performance. A maximum power density of 272 mW cm −2 is achieved, which is among the highest power outputs reported for DAMFCs in the literature.

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“…2 The rare-earth orthoferrites, having perovskite structure of general formula RFeO3 (where R is a rare-earth ion) have attracted much interest due to their novel magnetic 3 and magneto-optic 4 properties and are still the subject of much research aimed at a better understanding of properties of the magnetic subsystems and how interactions between them depend on external parameters, such as temperature, field, pressure, etc.. 3,4 Among them, NdFeO3 is known to be orthorhombically distorted perovskite structure. 5 These oxides have potential for various applications such as catalysts, 6 gas separators, solid oxide fuel cells (SOFCs) 7 sensor and magneto-optic materials. 8 The preparation of NdFeO3 and related compounds has been achieved by many methods, including a 24 high temperature ceramic method, hydrothermal synthesis, 9 combustion synthesis, 10 sol-gel, 2 and precipitation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of nano-structured perovskite type neodymium orthoferrite NdFeO3

Yousefi¹,

Zeid²,

Khorasani-Motlagh³

2017

10.5267/j.ccl

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In this investigation, neodymium orthoferrite (NdFeO3) nanoparticles has been synthesized through ultrasonic method in the presence of octanoic acid as surfactant. This method comparing to the other methods is very fast and it does not need high temperatures during the reaction. The spherical NdFeO3 nanoparticles with an average particles size of about 40 nm can be obtained at a relatively high calcination temperature of 800 °C for 4 h. Also, product obtained by this method are uniform in both morphology and particles size. The phase composition, morphology, lattice parameters and size of particles in these product are characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDX). The XRD analysis reveals only the pattern corresponding to perovskite type NdFeO3 which crystallizes in the orthorhombic structure. Energy dispersive X-ray analysis confirms the elemental compositions of the synthesized material.

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Synthesis and characterization of non-stoichiometric LaFeO3 perovskite

Cited by 101 publications

References 9 publications

Preparation of ReFeO₃ nanocrystalline powders by auto‐combustion of citric acid gel

Preparation of ReFeO₃ nanocrystalline powders by auto‐combustion of citric acid gel

Surfactant-Assisted Perovskite Nanofillers Incorporated in Quaternized Poly (Vinyl Alcohol) Composite Membrane as an Effective Hydroxide-Conducting Electrolyte

Synthesis and characterization of nano-structured perovskite type neodymium orthoferrite NdFeO3

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Synthesis and characterization of non-stoichiometric LaFeO3 perovskite

Cited by 101 publications

References 9 publications

Preparation of ReFeO3 nanocrystalline powders by auto‐combustion of citric acid gel

Preparation of ReFeO3 nanocrystalline powders by auto‐combustion of citric acid gel

Surfactant-Assisted Perovskite Nanofillers Incorporated in Quaternized Poly (Vinyl Alcohol) Composite Membrane as an Effective Hydroxide-Conducting Electrolyte

Synthesis and characterization of nano-structured perovskite type neodymium orthoferrite NdFeO3

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Preparation of ReFeO₃ nanocrystalline powders by auto‐combustion of citric acid gel

Preparation of ReFeO₃ nanocrystalline powders by auto‐combustion of citric acid gel