Clementine UVVIS images of the lunar sample-return sites have been processed and used to produce refined calibrations for the iron and titanium determination algorithms of Lucey et al. [1995, 1996]. The high spatial resolution of the Clementine data permits individual sampling stations to be resolved at the Apollo 15, 16, and 17 landing …
No coincidence that this is a timeline shared with the advent of Tio2 refinement and mainstream use in coatings. The paper continues to strengthen the ideal that for the industry to truly innovate, it must not do so gradually but rather act on a spark through transformational thinking that has the power to change how we look at coatings …
The mechanism is as follows: on the one hand, the incorporation of iron decreases the grain size of both TiO2-A and TiO2-R, and refinement of the grains increases the phase transformation temperature; on the other hand, the Fe3+ infiltrated into TiO2 attracts electron cloud of O atoms,causing O atoms to move towards Fe3+ during …
Improving the engineering properties of A356 alloy is an appealing option for the automotive industry. This study aimed at refining and redistributing Si particles and the eutectic phase by applying T6 heat treatment to a semi-solid A356 alloy, followed by severe plastic deformation (SPD). Using a cooling-slope technique, the as-cast and rheocast …
1. Introduction. Anodic titanium dioxide nanotubes (TNTs) have promising applications for biomedical implants because they can positively affect cellular behaviours, such as migration [1], adhesion [2], proliferation [2], [3], [4] and differentiation [5], [6].The diameter of TNTs is crucial to the vitality of cells [2] and the most widely used methods …
TiO2 is one of the most studied photocatalyst, however, in order to enhance the photocatalytic activity, several strategies for chemical or physical modifications have been reported. Among these strategies, microwave and sonochemistry assisted synthesis methods have been attracting attention due to the unique characteristics that can be …
DOI: 10.1016/j.jmrt.2023.01.159 Corpus ID: 256537152; Iron behavior during the continuous phase transition of iron-doped titanium dioxide determined via high-temperature in-situ X-ray diffraction, Rietveld refinement, …
Download Citation | Iron behavior during the continuous phase transition of iron-doped titanium dioxide determined via high-temperature in-situ X-ray diffraction, Rietveld refinement, and density ...
Nano-titanium dioxide (NT) is a nanomaterial (usually of spherical or ellipsoidal shape) that has become widely used in cement-based materials in the past …
Rutile titanium dioxide. It scatters light approximately 30% better than anatase, and it has better hiding power (the ability of titanium dioxide to cover the color of the painted surface). ... it is essential to implement rational methods of extraction and refinement of this mineral. Read more about titanium ore mining and processing. …
Titanium dioxide (TiO2) is widely used in various fields, and doped TiO2 exhibits different characteristics in different fields. Although numerous studies of Fe-doped TiO2 have been reported, they mainly analyze the influence of Fe on TiO2. The behavior of Fe during the phase transition of TiO2 has been rarely studied.
Ambient pressure preparation and structure refinement" by I. Grey et al. Semantic Scholar extracted view of "TiO2-II. Ambient pressure preparation and structure refinement" by I. Grey et al. ... The Hugoniot of the rutile phase of titanium dioxide has been determined to 1.25 megabars, and data show the existence of a phase change at about 0.33 ...
According to the results of the Rietveld refinement, the estimated chemical formulas for the TiO2 Bi 1%, TiO2 Bi 3%, TiO2 Bi 5%, and TiO2 Bi10% samples were Ti0.99Bi0.01O2, Ti0.97Bi0.03O2, Ti0 ...
Delicate refinement of surface nanotopography by adjusting TiO2 coating chemical composition for enhanced interfacial biocompatibility ACS Appl Mater Interfaces. 2013 Aug 28 ... Compared to the TiO2 coating, TiO2 coating doped with Nb2O5 enhanced primary human osteoblast adhesion and promoted cell proliferation, whereas TiO2 …
refinement leads to specify the anatase phase of Titanium oxide. The crystal structure of anatase (TiO. 2) is tetragonal with space group 141/a m d. The refinement of sample …
refinement of TiO2/CoFe2O4 is in good agreement with XRD results. The refined direct c ell volume for T iO 2 ar e found t o b e v=136.17 which is shown in table1.Refined data an alysis gives W yckoff
DOI: 10.1016/J.APSUSC.2012.09.102 Corpus ID: 95037101; Structural refinement and photocatalytic activity of Fe-doped anatase TiO2 nanoparticles @article{Delekar2012StructuralRA, title={Structural refinement and photocatalytic activity of Fe-doped anatase TiO2 nanoparticles}, author={Sagar D. Delekar and Hemraj M. …
About 95% of titanium ore is processed into titanium dioxide, which is the most widely used titanium product. The global TiO 2 market was valued at US$13.14 …
5 matching records for this search. Brookite. Meagher E P, Lager G A. The Canadian Mineralogist 17 (1979) 77-85. Polyhedral thermal expansion in the TiO2 polymorphs: Refinement. of the crystal structures of rutile and brookite at high temperature. Sample at 25 degrees C. _database_code_amcsd 0005160. 9.174 5.449 5.138 90 90 90 Pbca.
Titanium (Ti) is abundant in the earth's crust (0.7 mass pct as oxides).[] Metallic titanium shows excellent properties, such as the highest specific strength among structural metals [203–224 kN m kg −1 for Ti-6 mass pct Al-4 mass pct V (Ti 6–4)[]] and high corrosion resistance even in aqueous solutions containing chlorine ions.[] ...
Commercial titanium extraction is based upon an 80-year-old procedure developed by Luxembourg-born chemist William Kroll. Powdered titanium dioxide ore is placed in a smelter containing chlorine ...
Titanium Dioxide; Article PDF Available. Refinement of lunar TiO2 analysis with multispectral features of Chang'E-1 IIM data. September 2013; Astrophysics and Space Science 343(1)
Rietveld refinement data gave 2.59, 3.21 value of RB for pure TiO2 and 3.0 mol% Fe:TiO2 nanoparticles, respectively. Raman bands at 639 cm−1, 517 cm−1, and 395 cm−1 further confirmed the pure anatase phase in all samples.
nanocomposite of titanium dioxide and cobalt ferrite (TiO. 2 /CoFe. 2. O. 4) is synthesized using the co-precipitation method. The structural characterization of the prepared composite has been ... refinement leads to specify the anatase phase of Titanium oxide. The crystal structure of anatase (TiO. 2) is tetragonal with space group 141/a m d ...
Titanium dioxide, TiO 2, is one of the most industrially important simple oxides, and has numerous applications as a bright white pigment, an absorber of ultraviolet ... Small-box modelling is a method analogous to Rietveld refinement where the parameters of a crystal structure are refined against the PDF rather than the Bragg …
Nano-titanium dioxide (NT) is a nanomaterial (usually of spherical or ellipsoidal shape) that has become widely used in cement-based materials in the past decade. ... It was found that adding 3 % NT resulted in significant refinement of the mortar pores, with a 37.7 % increase in harmless pores (d < 10 nm) and a 34.6 % decrease in …
Tamer M (2013) Quantitative phase analysis based on Rietveld structure refinement for carbonate rocks. JMP 04(8):1149–1157. Google Scholar AL-Dhahir TA (2013) Quantitative phase analysis for titanium dioxide from X-ray powder diffraction data using the Rietveld method. Diyala J Pure Sci 9(2): 108–119
A new type of Al–TiO2–C–XEr2O3 aluminum alloy refiner is prepared by exothermic dispersion method, and the effect of different Er2O3 content on the structure and refinement effect of Al–TiO2–C refiner is studied by scanning electron microscope (SEM), X‐ray diffraction (XRD), and other methods. The results show that the refiners …
Composites of different polymorphs of titanium dioxide attract a particular attention in term of their superior photocatalytic activity, which is not just a simple sum of the photocatalytic properties of the components. ... and distance-least-squares refinement. Am. Miner. (1991) K.K. Paul et al. Mechanism of strong visible light photocatalysis ...
Ambient pressure preparation and structure refinement. The ∝-PbO 2 form of TiO 2 forms as a finely crystalline intermediate phase when Ti 3 O 5 is dissolved in sulphuric acid at elevated temperatures. Its structure has been refined using the Rietveld method applied to X-ray powder data. A structural model is proposed for the oxidation …
REFINEMENT OF THE CRYSTAL STRUCTURES OF RUTILE AND BROOKITE AT HIGH TEMPERATURE E. P. MEAGHER Department ol Geological Sciences, University of British Columbia, Vancouver, British Columbia V6T 1W5 GEORGE A. LAGER Department ol Geosciences, Rider College, Lawrenceville, New lersey 08648, U,S,A, temp6rature est …
A new type of Al–TiO 2 –C–XEr 2 O 3 aluminum alloy refiner is prepared by exothermic dispersion method, and the effect of different Er 2 O 3 content on the structure and refinement effect of Al–TiO 2 –C refiner is studied by scanning electron microscope (SEM), X-ray diffraction (XRD), and other methods. The results show that the refiners …
Semicoherently intergrown lamellae of a new TiO 2 mineral have been identified in anatase crystals from Binntal, Valais, Switzerland. This unnamed mineral has been reported previously as the synthetic polymorph TiO 2 (B) (Marchand et al., 1980). We have interpreted high-resolution electron micrographs to determine the positions of …
Crystallographic reference data for the anatase modification of TiO 2 were taken from Ref. [37] and used in the initial stages of refinement with the electron powder data. The first refinement cycles were used to adjust the background by a polynomial function of sixth order and for refining the overall scale factor, the zero shift and lattice …
As shown in Fig. 2 c and Fig. S6, the Rietveld refinement XRD profiles show well-fitted diffraction peaks corresponding to tetragonal anatase TiO 2 (I41/amd space group); and the related refinement structures show an obvious O deficiency by lowered O atomic fraction compared with intact TiO 2 (Table S2), implying V O existed in a total …
Semantic Scholar extracted view of "Polyhedral thermal expansion in the TiO2 polymorphs: Refinement of the crystal structures of rutile and brookite at high temperature Sample at 425 degrees C" by E. P. Meagher et al.
