Effect of Atmosphere on Crystallisation Kinetics and Phase Relations in Electrospun TiO
            <sub>2</sub>
            Nanofibres

Albetran, Hani Manssor; Haroosh, Hazim; Dong, Yu; O’Connor, B. H.; Low, It Meng

doi:10.1002/9781118771327.ch14

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…The TEM images showed an agglomeration of nanoparticles in form of nanofiber shape. It was clear that the diameter of nanofibers increased with increasing the content of substitution ions which indicated that the Er 3+ might cause a particles growth[8,[29][30][31]. Figure4illustrated the EDX spectra and elemental mapping of NiEr x Fe 2−x O 4 (x=0.04 and x=0.05) nanofibers which indicated the presence of Fe, Ni, and Er with no impurities.…”

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confidence: 86%

Synthesis, characterization and magnetic investigation of Er-substituted electrospun NiFe₂O₄ nanofibers

et al. 2020

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Erbium nickel-ferrite (NiErxFe2−xO4 where 0.00 ≤ x ≤ 0.05) nanofibers were prepared by a sol–gel electrospinning process utilizing polyvinylpyrrolidone (PVP) polymer (MW: 40.000). Nanofibers of as-electrospun nickel-ferrite with erbium substitution were calcinated in air at 700 °C for 6 h. After calcination, microscopy analysis indicated uneven nanofiber surfaces that were formed from grains. An increase in erbium concentration in the structure yielded an increase in the lattice parameters and the cell volume, but a decrease in the crystallite size. Elemental erbium, nickel, iron, and oxygen were present in the electrospun NiErxFe2−xO4 nanofibers with no impurities. The magnetic properties were examined via magnetization against magnetic field (M-H) measurements. The M-H curves of all prepared NiErxFe2−xO4 nanofibers were measured at two different temperatures; room temperature (T = 300 K) and low temperature (T = 10 K) throughout H of ±70 kOe. The values of Ms (saturation magnetization), Mr (remanence), Hc (coercivity), SQR = Mr/Ms (squareness ratio), and (magnetic moments) were determined. The prepared set of nanofibers showed soft ferrimagnetic behavior at both 300 and 10 K. At both measured temperatures Ms improved with increasing Er3+ concentration up to x = 0.02, then it decreased with further increase in the Er3+ content.

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confidence: 86%

Synthesis, characterization and magnetic investigation of Er-substituted electrospun NiFe₂O₄ nanofibers

et al. 2020

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“…With the increase in temperature and time, the change in rutile titanium dioxide grain size has a greater influence on the crystal form transformation [13,14]. There have been a number of studies on the growth kinetics of doped and undoped rutile titanium dioxide, particularly on the influence of iron doping on the growth kinetics of rutile titanium dioxide, which is an important physical chemical basis for the industrial application of the heat treatment process [15][16][17][18]. However, most current research methods calculate and analyze the grain size after cooling at a certain temperature during the heat treatment process, which does not accurately reflect the actual size of the grains at the real-time temperature during the heating process [19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Kinetic study on the effect of iron on the grain growth of rutile-type TiO₂ under in situ conditions

Xue

Luo

Long

et al. 2022

Mater. Res. Express

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There have been many studies on the growth kinetics of titanium dioxide and doped titanium dioxide. However, most calculated the grain size after isothermal treatment and cooling to room temperature; thus, the real grain size of titanium dioxide at the real-time temperature during heat treatment could not be obtained. This study thus aimed to obtain accurate grain information during the heat treatment process. In this study, titanium oxysulfate (TiOSO4) and ferric chloride (FeCl3·6H2O) were used to hydrolyze and precipitate TiO2 precursors containing impurity iron. Then, the sample was subjected to high-temperature in situ X-ray diffraction. Using the Williamson–Hall mapping method to process the X-ray diffraction information, the grain size could be used to characterize changes in the grain size, and the change law of TiO2 during the heat treatment process was studied. Furthermore, the effect of Fe doping on the growth of TiO2 crystals was examined through the crystal growth kinetics. The results revealed that when the Fe doping amount reached a certain level, it affected the growth mechanism of the rutile type titanium dioxide grains, thereby causing a change in the growth order. Specifically, an increase in the Fe doping amount increased the growth activation energy; that is, it inhibited the growth of rutile-type titanium dioxide grains.

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“…The transformation of anatase-to-rutile has been studied for 400–1200 °C [ 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ], but limited titania thermal-expansion data exist near the transition temperature. Titania thermal expansion has not been studied in detail and the effects of form, crystal structure, synthesis, doping, particles size, surface area, and atmospheric reactions from a high to a transition temperature are unknown.…”

Section: Introductionmentioning

confidence: 99%

Thermal expansion coefficient determination of pure, doped, and co-doped anatase nanoparticles heated in sealed quartz capillaries using in-situ high-temperature synchrotron radiation diffraction

Albetran

2020

Heliyon

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Synchrotron radiation diffraction was conducted in-situ and at high temperature to establish the lattice parameters of pure/undoped, doped, and co-doped anatase nanoparticles. The nanoparticles were heated from room temperature to 950 °C in sealed quartz capillaries. The effect of pressure, doping (aluminium or indium), and co-doping (indium-chromium or silver-chromium) on the thermal expansion coefficients of nanocrystalline anatase was established. Synchrotron radiation diffraction at high temperature and in-situ , transmission electron microscopy, and the Rietveld refinement method were used to characterise the anatase nanoparticles. The anisotropy of the thermal expansion, α a /α c , for pressurised anatase nanoparticles was smaller than that for anatase heated in unpressurised air or argon, and it was much smaller in a vacuum.

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Effect of Atmosphere on Crystallisation Kinetics and Phase Relations in Electrospun TiO ₂ Nanofibres

Cited by 5 publications

References 24 publications

Synthesis, characterization and magnetic investigation of Er-substituted electrospun NiFe₂O₄ nanofibers

Synthesis, characterization and magnetic investigation of Er-substituted electrospun NiFe₂O₄ nanofibers

Kinetic study on the effect of iron on the grain growth of rutile-type TiO₂ under in situ conditions

Thermal expansion coefficient determination of pure, doped, and co-doped anatase nanoparticles heated in sealed quartz capillaries using in-situ high-temperature synchrotron radiation diffraction

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Effect of Atmosphere on Crystallisation Kinetics and Phase Relations in Electrospun TiO 2 Nanofibres

Cited by 5 publications

References 24 publications

Synthesis, characterization and magnetic investigation of Er-substituted electrospun NiFe2O4 nanofibers

Synthesis, characterization and magnetic investigation of Er-substituted electrospun NiFe2O4 nanofibers

Kinetic study on the effect of iron on the grain growth of rutile-type TiO2 under in situ conditions

Thermal expansion coefficient determination of pure, doped, and co-doped anatase nanoparticles heated in sealed quartz capillaries using in-situ high-temperature synchrotron radiation diffraction

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Effect of Atmosphere on Crystallisation Kinetics and Phase Relations in Electrospun TiO ₂ Nanofibres

Synthesis, characterization and magnetic investigation of Er-substituted electrospun NiFe₂O₄ nanofibers

Synthesis, characterization and magnetic investigation of Er-substituted electrospun NiFe₂O₄ nanofibers

Kinetic study on the effect of iron on the grain growth of rutile-type TiO₂ under in situ conditions