Tantalum oxide, deposition

Sidorova, M.P. et al., Electrokinetic properties of tantalum oxide deposited onto a model substrate in NaCI and LiCl solutions. Colloid J., 59, 528, 1997. 

P. J. Martin et al. Properties of thin films of tantalum oxide deposited by ion-assisted deposition. Thin Solid Films 1994, 238, 183-184. 

A large deposit of loparite occurs ia the Kola Peninsula, Russia. The production of REO reaches 6500 t/yr. Loparite contains over 30% of rare-earth oxides from the cerium group. In addition, loparite contains up to 40% titanium oxide and up to 12% niobium and tantalum oxides. 

Intratracheal administration to guinea pigs of 100 mg of tantalum oxide produced transient bronchitis, interstitial pneumonitis, and hyperemia, but it was not flbrogenic. There were some slight residual sequelae in the form of focal hypertrophic emphysema and organizing pneumonitis around metallic deposits, and there was slight epithelial hyperplasia in the... 

Schematic representation of a metal-arch capacitance transducer according to Jones et al. [245]. This capacitance transducer is of the variable-area electrode type. A tantalum/tantalum oxide film structure is deposited onto a flat glass substrate to obtain a suitably flat surface for contact with a flexible electrode which may be a thin metal foil possibly deposited in the shape of a dome or an arch...

KCl-NaCl-K2TaF7 melts On addition of potassium heptafluotantalate to the NaCl-KCl melt a peak of tantalum reduction to metal (Rl) from fluoro-chloro complex (as will be shown below) was observed on voltammograms (Fig. 1). On the anodic part of the curve several peaks of the deposited tantalum oxidation correspond to it. The anodic peaks OJ andOJ" should be referred to tantalum dissolution respectively in the form of Ta(lV) and Ta(V) chloro complexes, formed in the absence of excess fluoride ions. Recording of the cyclic voltammetric curve with a potential reverse at more positive potential -0.48 or -0.6 V (Fig.l), when the amount of tantalum deposited at the electrode is small and there is not enough time for diffusion of a considerable quantity of the liberated fluorine into the melt bulk, shows no such peaks, which corroborates our assumption. Peaks Oi and OJ were caused by tantalum disso-... 

Kukli K., Ritala M., Leskelae M. Atomic layer deposition and chemical vapor deposition of tantalum oxide by successive and simultaneous pulsing of tantalum ethoxide and tantalum chloride. Chem. Mater. 2000 12 1914-1920... 

Sol-gel proton conducting tantalum oxide (Ta20s) films wctc deposited by spincoating using Ta(OC2Hs)5 as a precursor by Ozer et al. (1994, 1997). The films were amorphous after heat treatment at 150°C and exhibited a proton conductivity at room temperature of about (Ozer, 1994). The coloring and bleaching cycles of... 

Ozer N., He Y., Lampert C.M. Ionic conductivity of tantalum oxide films prepared by the sol-gel process for electrochromic devices. Proceedings of SPIE Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, 1994 2255 456 66 Ozer N., Lampert C.M. Electrochemical lithium insertion in sol-gel deposited LiNbOs films. Sol. 

Mhere materials are labelled with an asterisk, a large number of powders were successfully deposited using the suspension medium described. Mizuguchi et al included alumina barium, strontium and calcium carbonates magnesia, zinc oxide, titanium dioxide, silica, indium oxide, lanthanum boride, tungsten carbide, cadmium sulfide and several metals and phosphors. The list of materials described by Gutierrez et al included several metals carbides of molybdenum, zirconium, tungsten, thorium, uranium, neptunium and plutonium zirconium hydride, tantalum oxide and uranium dioxide. In addition, many metallic and oxide powder suspensions in alcohols, acetone and dinitromethane were studied by Brown and Salt ... 

Another example is the siliciditing of tantalum, basically an oxidation— reduction reaction. The packing is sodium duoride and siUcon. After deposition, the coating diffuses continuously into the substrate, according to the following reactions ... 

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