Magnesium titanate

Magnesium titanate has many useful applications, for example, in dew sensors, in pigments, and in the electrical and electronic industries as a dielectric material for manufacturing on-chip capacitors, high-frequency capacitors, and temperature compensating capacitors. 

Yanovskaya et al. [104] obtained sintered MgTiOs ceramic using alkoxy-derived powders. The precursor powders were prepared from Mg(OBu)2 and Ti(OBu)4 in butanol under reflux. The hydrolysis takes place with distilled water and BuOH in [H2O] [Ti(OBu)4] molar ratio of 12. 

Sintered MgTiOs ceramic was obtained without any mineralizing agents in the temperature range of 1140-1220 °C, which is 150-200 °C lower than that required for the conventional synthesis from oxides or by precipitation from aqueous solutions. 

Ceramic bodies were dense, with a porosity of 2-3% and a mean crystallite size from 2 to 4 pm. Dielectric permittivity of the ceramics was 17.8-18.5 and 

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Enhanced anti-corrosion properties are also reportedly achieved by mill additions of lithium titanate, lithium aluminate or magnesium titanate to the host glass frit . 

Two methods are commonly used for the determination of magnesium. Titan yellow may be used to obtain a coloured colloidal suspension, or solochrome black to give a red soluble complex. In most cases the second of these is to be preferred. 

Sychev, M. M., Medvedeva, I. N., Biokov, V. A. Krylov, O. S. (1982). Effect of reaction kinetics and morphology of neoformation on the properties of phosphate cements based on magnesium titanates. Chemical Abstracts, 96, 222252e. 

Magnesium titanates have also been used to form such cements. Mg2Ti04, MgTiOs, and Mg2Ti20s have been reacted with phosphoric acid by Sychev et al. [35] and Sudakas et al. [36]. Newberyite is formed when Mg3Ti04 is used, but in other cases, amorphous phases are formed that are difficult to identify. 

MgFj solid electrolytes have also been used to measure activities of MgO in both compounds (Magnesium Titanates - Shah et al, 1970) and solid solutions involving MgO. In the latter category, MgO-ZnO, MgO-CoO and MgO-NiO have been studies by Raghavan et al. (1975) and Prasad (1971). Seetharaman (1970) has rechecked some of the results. He found very good agreement in results obtained from the different techniques. 

Magnesium titanate. A detail investigation of mechanochemical synthesis of magnesium titanate from anhydrous and hydrated magnesium and titanium oxides for preparing the ceramics of the highest quality was... 

Liao J.F., Senna M. Crystallization of titania and magnesium titanate from mechanically activated Mg(OH)2 and T1O2 gel mixture. Mater. Res. Bull. 1995 30 385-92. 

The data from Table 2.2 can be used to assess whether a mixed oxide (salt) is formed spontaneously. It has been already shown that Mg(OH)2 is more stable than MgO. Let us explore the possibility of formation of magnesium titanate (Mg(II)-Ti(IV) mixed oxide) as a result of reaction of Mg(OH)2 (e.g. formed by surface precipitation) and rutile. 

V. M. Ferreira, F. Azough, J. L. Baptista, and R. Freer, Magnesium Titanate Microwave Dielectric Ceramics, Ferroelectrics, 133, 127-32 (1992). 

Dharmaraj N, Park HC, Lee BM, Viswanathamurthi P, Kim HY, Lee DR. Preparation and morphology of magnesium titanate nanofibres via electrospinning. Inorg. Chem. Commun. 2004 7 431 33. 

Yanovskaya MI, Kotova MM, Golubko NV, Torova NY. Reaction of magnesium and titanium aUcoxides, preparation and characterization of alkoxy derived magnesium titanate powders and ceramics. J Sol-Gel Sci Technol 1998 ll(l) 23-9. 

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