Niobium titanate

Chrome Niobium Titanate Yellow, pigment for plastics, 7 370t Chrome Orange, 6 523, 554, 555t pigment for plastics, 7 370t Chrome ore, as a refractory raw material, 21 490... 

Nickel niobium, 17 123—124 Nickel Niobium Titanate Yellow, pigment for plastics, 7 370t... 

Finally, a number of other mixed oxides that do not have the perovskite structure have also been examined. For example, niobium titanates with the rutile structure,tetragonal tungsten bronze... 

Of these, bastnasite is the only mineral worked primarily for rare earths and both monazite and xenotime are mostly by-products of mining ilmenite, rutile, cassiterite, zircon or gold. Apatite and some multi oxide minerals like pyrochlore, euxenite, brannerite and loparite (a niobium titanate) are also commercial sources of rare earths, but production of RE from these is limited. 

The removal of titanium from mixed niobic and tantalic acids is a difficult matter. Although titanium and niobium compounds display considerable differences in their general behaviour, when the two elements occur together they appear to undergo a change, in consequence of which they become difficult to separate. Niobic acid, for instance, is precipitated from a much more concentrated boiling sulphuric acid solution than is titanic acid but when the two acids are dissolved... 

In addition to dissolving in acids, freshly precipitated niobium pentoxide dissolves in caustic soda and in caustic potash, and hence it appears to possess weakly amphoteric character. Its colloidal state in solution has hitherto prevented any direct determination of its basicity or acidity. According to Weinland and Storz 6 it is comparable to silicic acid, and is more strongly acid than titanic add. That niobic add is a very weak add is shown by the readiness with which the niobates are (a) hydrolysed and (b) decomposed by mineral acids,... 

Reagan M. K. and Gill J. B. (1989) Coexisting calcalkaline and high-niobium basalts from Turrialba Volcano, Costa Rica implications for residual titanates in arc magma sources. J. Geophys. Res. 94, 4619-4633. 

Jeon, J.-H. and Kang, S.-J. L., Effect of sintering atmosphere on interface migration of niobium-doped strontium titanate during infiltration of oxide melts, J. Am. Ceram. Soc., 77, 1688-90, 1994. 

Hong, S.-H., Trolier-McKinstry, S. and Messing, G. L., Dielectric and electromechanical properties of textured niobium-doped bismuth titanate ceramics, J. Am. Ceram. Soc., 83, 113-18, 2000. 

Ammonium citrate dibasic Barium fluoride Barium nitrate Bismuth Calcium fluoride Calcium titanate Carbon Cobalt sulfate (ous) Gold Hydrogen peroxide y-Linolenic acid Niobium oxide Nitrogen Palmitoleic acid Polyester carbonate resin Selenium Sodium chlorite Strontium titanate electronics applies. 

Niobium ( Nb) (7=9/2). Single-layer Nb-substituted titanate nanosheets was studied by Nb MAS NMR and it was proved that Nb is finely dispersed into the transformed (Ti, Nb)02 oxide matrixes without sign of Nb205 ppts. A series of phase transitions NaNb03 was studied by... 

A variety of other nanoparticles have been formed by such in situ sol-gel reactions. Examples are the oxides of titanium, aluminum, - tanta-lum, zirconium, niobium, and vanadium. Some nanocomposites of this type have also included barium titanate, calcium oxide, calcium salts, borates, HTiNbOg, and Eu dopants. ... 

Bianchi VG, Mazza F, Trasatti S (1964) Anodisches Verhalten und Passivitat einiger interstitieller Verbindungen von Niobium, Tantal, Titan und Wolfram. Z Phys Chem 226 40-58... 

Hayashi, K., Yamamoto, T., and Sakuma, T. (1996). Grain orientation dependnce of the PTCR effect in niobium-doped barium titanate. J. Am. Ceram. Soc. 79 1669-1672. 

Tian B, Xiang H, Zhang L et al (2010) Niobium doped lithium titanate as a high rate anode material for Li-ion batteries. Electrochim Acta 55 5453-5458... 

The nature of the majority defects depends on the temperature and the partial pressure of oxygen. An example is given in Figure 11.4 in the case of strontium titanate doped with niobium. In reducing atmosphere (Po2 oxygen... 

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