Abstract. Different shaped rutile TiO2 coated mica-titania pigments were prepared by hydrolysis of TiCl4 ethanolic solution at 70 degrees C. SnO2 as a rutile promoting additive was deposited onto ...Web
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Request PDF | Van der Waals Epitaxy of Anatase TiO 2 on mica and Its Application as Buffer Layer | MICAtronics, based on the functional oxide/mica …Web
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TiO2 (anatase) coated mica was carried out with the following procedure: 3 g pre-treated mica was suspended in distilled water and was heated to 348 K. The pH value of solution was adjusted to 2.0 3. Results and discussion by 5% HCl. Next, a TiOCl2 solution was introduced into the agitated slurry at a rate of 0.8 ml min 1.Web
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At 296 K, the permittivity along with the c- and a-axes was determined to be 166.7 and 89.8, respectively. As the temperature was decreased to 4 K, the permittivity increased to 251 along with the ...Web
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In situ powder X-ray diffraction and quantitative phase analysis using the Rietveld method to monitor the structural properties of a titania-supported iron pre-catalyst during calcination (oxidation) and activation (reduction) in the temperature range 25-900°C reveal an increase in anatase particle size before the anatase to rutile phase …Web
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Biotite and muscovite are two closely related minerals that belong to the mica group of sheet silicate minerals. While they share some similarities, they also have distinct differences in terms of their chemical composition, physical properties, and geological occurrences. Here's a comparison between biotite and …
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Abstract. This paper describes an experimental method for preparing mica titania pearlescent pigments in which the substrate is coated with iron blue. The …Web
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Gao et al. [21]. produced mica-titania pigments with methods of the hydrolysis of titanium tetrachloride above the mica flakes without calcination and investigated the effect of MnO 2 on to the anatase-rutile transformation. Furthermore, silica (SiO 2) and aluminum nitride (AlN) nanoparticles were widely used as nanofillers for polymer ...Web
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Transition magnetic metals (Fe, Ni, Co) were inserted into sodium titanate nanotubes subjected to calcination. In the calcination process at 400 °C, the nanotubular structure of the samples with magnetic species breaks down, while at 800 °C the formation of TiO 2 nanoparticles occurs mainly in the anatase and rutile phases. Optical studies …Web
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In this report, Kim et al. showed that oxygen-vacancy titanium neighbor atoms have a weak magnetic moment (0.06 μ B) in the case of anatase and a higher magnetic moment (0.22 μ B) for rutile ...Web
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Bragg diffraction angle) and the mass fraction of anatase (X A) was calculated by the formula X A ¼ (1 + 1.26(I R/I A)) 1 (ref. 31) (where I A and I R are the intensities of the anatase (101) plane and rutile (110) plane) and all the results are shown in Table 1. The crystallite size of pure TiO 2 increases with increasing temperature. Sn–TiOWeb
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The robust magnetic behaviors against mechanical bending were characterized by hysteresis measurements and magnetic force microscopy, which remain a saturation magnetization (Ms) of ~120-150 emu ...Web
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To evaluate the possibility of screening E171 materials without prior knowledge on crystallographic composition or the presence of mica, the anatase materials and rutile material E171-F were prepared by protocol P1, as well as by protocol P6 . In most cases, P6 resulted in slightly smaller median particle size measurements than P1, which …Web
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Here, we explored the role of the anatase/rutile phase in tuning the magnetic, optical, and dielectric properties of undoped TiO 2 and Ti 0.94 Mg 0.06 O 2 samples …Web
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Cordierite forms grains that display a shifting blue-to-gray color as you turn it. This unusual feature is called dichroism. If that isn't enough to identify it, cordierite is commonly associated with mica minerals or chlorite, its alteration products. Cordierite has few industrial uses. Glassy luster; hardness of 7 to 7.5.Web
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Muscovite mica is a commonly used substrate because it is atomically flat, with a layer height of (0.37 ± 0.02) nm . It is also easily cleaned by removing the top layer using adhesive tape, making sample preparation easy because its crystal structure consists of silica tetrahedral sheets weakly bonded to one another. ... Using anatase NPs ...Web
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First, we invested the magnetic properties of pure, doped and defective CeO 2. Table 1 lists the magnetic moment of doped and defective CeO 2, and shows that C, N and Pr dopants and O vacancies (O ...Web
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Magnetite is rock mineral and one of the most important iron ore minerals with chemical formula is iron(II,III) oxide, Fe2+Fe3+2O4 .It also as the name magnetic minerals to attracted to a magnet. It is the most magnetic natural occuring minerals in the World. Small grains of magnetite occur in almost all igneous and metamorphic rocks.. …Web
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Some have also been used due to such properties as electrical conductivity, magnetic properties and IR reflection [11–13]. Show abstract. ... TiO 2 nanolayers in rutile phase were formed on the mica surfaces. The morphology and the anatase–rutile transformation were probed by scanning electronic microscopy (SEM) and X-ray …Web
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Muscovite is a common mineral that belongs to the mica group. It is a silicate mineral that is characterized by its thin, sheet-like structure. Muscovite is composed of potassium (K), aluminum (Al), silicon (Si), and oxygen (O) atoms arranged in sheets, and it is known for its excellent cleavage, which allows it to be easily split into thin, flexible sheets.Web
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Herein, we report an in-depth study of the magnetic properties of commercial fluorophlogopite mica crystals as a function of magnetic …Web
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Abstract. Magnetic susceptibility measurements of anatase single crystals of TiO 2 are reported for the first time. The anatase single crystals behave like a large gap …Web
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For anatase the activity increases for films up to ~5 nm thick, while rutile films reach their maximum activity for ~2.5 nm films already. This shows that charge carriers excited deeper in the ...Web
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The XRD data such as crystallite size, phase composition and CLD of 5 mol% La doped TiO 2 nanoparticles calcined at different temperature were shown in Table 1.It could be seen that the anatase and rutile phase crystallite size of the as-prepared TiO 2 nanoparticle samples became larger with increasing calcination temperature, while the …Web
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M. Stiller, J. Barzola-Quiquia, P. Esquinazi, D. Spemann, J. Meijer, M. Lorenz, M. Grundmann; Strong out-of-plane magnetic anisotropy in ion irradiated anatase TiO 2 …Web
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TiO 2:Fe 3+ (Fe: 0–14.54 at%) nanoparticles were synthesized by hydrothermal method.. Fe 3+-doping of TiO 2 nanoparticles enhances the anatase to rutile transformation.. The shifting and broadening of the Raman modes of TiO 2 by Fe dopant are observed.. The band gap energy of TiO 2:Fe 3+ decreases with increasing Fe 3+ …Web
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After calcination at 700 °C for 2 h, TiO2 nanolayers in rutile phase were formed on the mica surfaces. The morphology and the anatase–rutile transformation were probed by scanning electronic ...Web
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Diagenetic conditions controlling authigenic formation of anatase and in situ LA-ICP-MS U–Pb isotope dating of this phase are studied in Upper Rotliegend II sandstones from two wells in NW-Germany. Anatase grew after breakdown of detrital Ti-phases (e.g. ilmenite) although local scale Ti transport and mobilization from detrital clay-hematite …Web
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Abstract. Rutile TiO2-coated mica–titania pigments were prepared by hydrolysis of titanium tetrachloride in the presence of Fe3+. After calcination at 700 °C for …Web
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For instance anatase finds application in photovoltaics, 7 electrodes for Li-ion batteries 8 and photocatalysis 9 for water and air purification. Rutile, due to its higher refractive index, is mostly studied for optoelectronics, semicondoctor electronics 10 and optical coatings. 11 Hence controlling the crystalline structure of TiO2 is of ...Web
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Composition: Lepidolite is a complex lithium aluminum silicate mineral with the chemical formula K (Li,Al,Rb)3 (Al,Si)4O10 (F,OH)2. It contains lithium (Li), aluminum (Al), rubidium (Rb), silicon (Si), oxygen (O), fluorine (F), and hydrogen (H). Lithium content: Lepidolite is one of the primary lithium-bearing minerals, and it can contain a ...Web
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the anatase to rutile transformation, and the principles of controlling phase composition through the inhibition or promotion of the transformation of anatase to rutile. Titania polymorphs Titanium dioxide, the only naturally occurring oxide of titanium at atmospheric pressure, exhibits three poly-morphs: rutile, anatase, and brookite [1–7].Web
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Titania has two main stable crystalline forms: titanic and anatase. Titanic is the most stable one, and anatase converts into titanic form at high temperatures over 915°C. From the thermodynamic data, the formation heat of anatase is 8–12 kJ·mol –1, and so it should be more stable than titanic [209].Web
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The present study reports the sol–gel synthesis and characterization of pure titania and metal-ion (Manganese) modified photocatalysts. The XRD results of pure titania confirmed the tetragonal structure having anatase as the predominant crystalline phase with no conspicuous presence of any secondary phase. In the modified photocatalysts, the …Web
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A new kind of composite mica pigments were prepared by coating Co 2−x M x TiO 4 composite oxide nanoparticles onto mica, to investigate the effects of doping ions Mg 2+, Mn 2+, Ni 2+, Cu 2+ and Zn 2+ on the properties of the doped composite pearlescent pigments, such as the crystal structure, color and shading power. The structure, …Web
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more superior photocatalytic activity than pure anatase or rutile phase TiO 2 by many researchers. Lyu et al.19 fabricated a TiO 2 hollow heterophase junction by coating anatase TiO 2 hollow spheres with porous amorphous TiO 2, and the obtained TiO 2 exhibited preferable adsorption capability, light harvestingWeb
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The anatase nanoparticulate thin film deposited at 400 °C exhibit mixed-phases of anatase and rutile with Raman frequencies centred at 144 (A), 248 (R), 445 (R), and 612 (R) cm −1 respectively.Web
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The samples were single crystals of size 0.1–0.2 mm of anatase and natural brookite from Magnet Cove, Arkansas. The enthalpies of solution for the brookite-rutile and anatase-rutile transformations are −0.17 ± 0.09 kcal mol −1 and −0.78 ± 0.2 kcal mol −1, respectively, at 971 K.Web
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