Titanate spinel titanates

Titanium IV) oxide, T1O2. See titanium dioxide. Dissolves in concentrated alkali hydroxides to give titanates. Mixed metal oxides, many of commercial importance, are formed by TiOj. CaTiOj is perovskite. BaTiOa, per-ovskite related structure, is piezoelectric and is used in transducers in ultrasonic apparatus and gramophone pickups and also as a polishing compound. Other mixed oxides have the il-menite structure (e.g. FeTiOj) and the spinel structure (e.g. MgjTiO ). 

Vemeud (flame fusion) mby, sapphires, and stars spinel mtile strontium titanate... 

M2Ti04 (M = Mg, Zn, Mn, Fe, Co) have the spinel stmcture (MgAl204, p. 248) which is the third important stmcture type adopted by many mixed metal oxides in this the cations occupy both octahedral and tetrahedral sites in a cep array of oxide ions. Ba2Ti04, although having the same stoichiometry, is unique amongst titanates in that... 

Chrome alumina pink spinel, formula and DCMA number, 7 348t Chrome Antimony Titanate Buff, pigment for plastics, 7 369t Chrome brick, 6 495 Chrome dyes, 9 468 26 396 Chrome green, 6 554 color, 7 331... 

Finally, NMR has also be used to study other spinels materials that do not contain manganese. For example, the intercalation/deintercalation of lithium titanate spinels such as Li4/3+Ji5/304 and Lii.i-Tii.904+a have been investigated. These materials may be used as anode materials in combination with cathodes operating at 4 V (vs Li) to produce cells with potentials of ca. 2.5 V. These materials are either diamagnetic or metallic, and unlike the mangan-ates, only very small differences in shifts are seen for Li in the different sites of the spinel structure. Nonetheless, these shift differences are enough to allow the concentrations of the different sites to be quantified and monitored following insertion of Li or as a function sample preparation method. ... 

Zinc orthotitanate [12036-69-0], ZmTi04, a white solid having a density of 512(0) and a spinel structure, is obtained by heating the calculated amounts of the two oxides at 1000°C. Zinc orthotitanate forms a series of solid solutions with titanium dioxide, extending to the composition Zn2Ti04 1.5Ti02. These solid solutions begin to dissociate at 775°C with the formation of the rutile form of titanium dioxide. The properties of the rare-earth titanates and their electronic structure are available (117—119). 

The chapters in Characterization and Catalyst Development An Interactive Approach, assembled from both academic and industrial contributors, give a unique perspective on catalyst development Some chapters thoroughly characterize the catalyst prior to plant evaluation, whereas others utilize characterization to explain performance variances. Some new types of catalysts incorporated into this volume include the preparation of novel catalyst supports based on alumina and hydrous titanates. Attrition-resistant catalysts and ultrafine ceramics were prepared by modified spray-drying methods. New catalyst compositions based on vanadium-containing anionic clays were proposed for oxidation. A recently commercialized catalyst based on magnesium spinel was proposed for use in the abatement of sulfur oxide pollutants in fluid... 

This rule can be applied to both electronic and dielectric polarizabilities, but here we discuss the rule only insofar as it applies to dielectric polarizabihties. The molecular or oxide additivity rule has been applied to hydrates, to the compounds MTiOs where M = Mg, Ca, Sr, and Ba, to dolomite (CaMg(C03)2), zircon (ZrSi04), and spinel (MgAl204), to several titanates andzirconates andKMgFs, and to a variety of minerals. " ... 

An X-ray analysis carried out on the insulator-insulator solids and on the insulator-semiconductor solids revealed that they were amorphous or badly crystallized. Since the preparation temperature was rather low, the presence of bulk compounds such as silicates, spinels and titanates is very unlikely although the incipient formation of disordered surface compounds cannot be excluded. Thus the solids should be considered intimate mixtures in which the chemical features of each component are not changed in a significant way. Indeed the I.R. measurements also support the idea that interaction between the components of the binary oxides is not strong. 

Both of these materials can be "activated" by Mn which also forms a spinel, i.e.- Mn2Sn04. The latter as a phosphor, i.e.- Mg2GKi04 Mn , is used as the source of green light in most copsdng machines today. It is interesting to note that the cubic spinel structure is formed by a majority of dibasic cations like Mg and that many trivalent or quadrivalent cations can form oxide-based anions like stannate. aluminate, titanates, vanadates and the like. 

Chiang, Y. M. Peng, C-J. (1987). Grain-boundary non-stochiometry in spinels and titanates. Advances in Ceramics, Vol. 23. Eds C. R. A. Catlow and N. C. Mackrodt. American Ceramic Society, Ohio, pp. 361-78. 

Synthetic ruby 2 %Ct20 in a-Al203) for lasers is made industrially by the Verneuil method as are single crystals of corund itself, sapphire, rutile, spinels, and strontium titanate. In this method the oxide particles are dropped through a flame,... 

---