نتایج جستجو برای: rutile phase

تعداد نتایج: 601169  

Journal: :Physical review letters 2008
O Warschkow Y Wang A Subramanian M Asta L D Marks

We resolve the structure of a c(2x2) reconstruction of the rutile TiO2 (100) surface using a combination of transmission electron diffraction, direct methods analysis, and density functional theory. The surface structure contains an ordered array of subsurface oxygen vacancies and is in local thermodynamic equilibrium with bulk TiO2, but not the with oxygen gas-phase environment. The transition...

2003
E. J. ESSENE S. B. MUKASA

The prograde metamorphism of eclogites is typically obscured by chemical equilibration at peak conditions and by partial requilibration during retrograde metamorphism. Eclogites from the Eastern Blue Ridge of North Carolina retain evidence of their prograde path in the form of inclusions preserved in garnet. These eclogites, from the vicinity of Bakersville, North Carolina, USA are primarily co...

2001
Vinothan N. Manoharan Arnout Imhof James D. Thorne David J. Pine

The emergence of the field of photonic crystals has led to a surge of research on the fabrication of macroporous materials. Calculations show that a complete optical photonic bandgap may be observed if such materials have a sufficiently high index of refraction and contain ordered pores with periodicity on the order of the wavelength of visible light. With a complete gap there is a range of fre...

Journal: :European journal of materials 2023

Ceramic foams present special features that do not have the corresponding dense materials and hence they are widely used in a broad variety of applications. Titania has exceptional photoinduced properties with applications membranes, bioceramics photocatalysis photovoltaics. However, applications, anatase phase is more active, but sintering at high temperatue leads to transformation rutile. The...

2005
Krishnankutty-Nair P. Kumar Jalajakumari Kumar Klaas Keizer

Porosity reduction, packing, pore-size distribution, and anatase to rutile phase transformation behavior of nanostructured titania ceramics prepared from both peptized and unpeptized sols were studied and compared using XRD, DSC, and nitrogen-gas physisorption techniques. Precursor gels prepared from the peptized sol had a green density of about 70% after drying at 4 0 T , whereas the samples p...

Journal: :Small 2015
Mengye Wang Dajiang Zheng Meidan Ye Chuchu Zhang Binbin Xu Changjian Lin Lan Sun Zhiqun Lin

By using one-dimensional rutile TiO(2) nanorod arrays as the structure-directing scaffold as well as the TiO(2) source to two consecutive hydrothermal reactions, densely aligned SrTiO(3) -modified rutile TiO(2) heterojunction photocatalysts are crafted for the first time. The first hydrothermal processing yielded nanostructured rutile TiO(2) with the hollow openings on the top of nanorods (i.e....

2002
Dongbai Zhang Limin Qi Jiming Ma Humin Cheng

Shuttle-like crystalline TiO2 nanoparticles were synthesized by hydrolysis of titanium tetrabutoxide in the presence of acids in NP-5 (Igepal CO-520)–cyclohexane reverse micelle at room temperature. Pure rutile nanoparticles were obtained at appropriate acid concentrations. The influences of various reaction conditions, such as concentration and type of acid, water content, H2O/Ti molar ratio, ...

Journal: :Acta Crystallographica Section A Foundations of Crystallography 2005

2016
Wen-Kai Kuo Hsueh-Ping Weng Hsin Her Yu Samuel B. Adeloju

Polystyrene (PS) opal and titania (TiO2) inverse opal films were fabricated by the self-assembly colloidal crystal template technique. Based on Bragg’s law, these sensors were used to detect the different concentrations of ethanol solution. The results indicated that TiO2 inverse opal films were advantageous over PS opal film for detecting the ethanol concentration. TiO2 inverse opal films sint...

2010
Nina V. Burbure Paul A. Salvador Gregory S. Rohrer

Titania films have been grown on polycrystalline BaTiO3 (BTO) substrates at 7001C by pulsed laser deposition. Electron backscatter diffraction (EBSD) was used to determine grain orientations in the substrate before growth, and the phase and orientation of the supported films after growth. All BaTiO3 grains within 261 of (001) were covered by anatase films with an orientation relationship of (00...

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