As shown by the results in Table 1, it is clear that the mass percentage of rutile increases with increasing Sn content, suggesting that the transition from anatase to rutile is promoted and the phase transformation temperature is reduced by Sn doping.There are several explanations for this phenomenon. Tripathi et al. 23 believe that higher surface energy is …Web

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

Schist. Modified date: 27/08/2023. Schist is a type of metamorphic rock characterized by its foliated texture, which means it possesses distinct layers or bands of minerals that have undergone significant physical and chemical changes due to heat, pressure, and other geological processes. The term "schist" is derived from the Greek …Web

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

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

The light-induced phase transition of TiO2 nanoparticles from anatase to rutile structure is reported depending on the surrounding environment, the transition being accomplished under oxygen-poor conditions. The transition mechanism is interpreted in the framework of oxygen adsorption and desorption phenomena with the involvement of surface oxygen …Web

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

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

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

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

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

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

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

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

Classification of minerals on the magnetic properties: Strongly magnetic minerals: franklinite, maghemite, magnetite, pyrrhotite (monoclinic), titanomagnetite Medium magnetic minerals: aeschynite ...Web

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

The presence of such nanoparticles is supported by thermodynamic studies which show that though under ambient conditions rutile is a more stable phase than anatase; however, this stability is size dependent and for nanoparticles smaller than 10–14 nm, anatase is a more stable phase. 10 Using UV-Raman scattering, from low frequency …Web

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

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

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

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

Titanium dioxide, TiO2, is an important photocatalytic material that exists as two main polymorphs, anatase and rutile. The presence of either or both of these phases impacts on the photocatalytic performance …Web

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

Abstract. This paper describes an experimental method for preparing mica titania pearlescent pigments in which the substrate is coated with iron blue. The …Web

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

On the other hand, some theoretical simulations predict that the anatase phase is conversely more stable than the rutile phase for nanocrystals less than 14 nm in size 24,25,26,27, Because these ...Web

The present study investigates the influence of cobalt doping on the structural and magnetic properties of TiO 2 nanoparticles prepared by a simple wet chemical method. The single phase anatase structure of Co-doped TiO 2 nanoparticles was confirmed by X-ray powder diffraction. A morphological study using scanning electron microscopy and …Web

TiO2 has three well-known polymorphs at atmospheric pressure: rutile, anatase and brookite. Brookite is hardly studied due to its metastable crystal structure …Web