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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 11    
Website: http://www.ijser.org
scirp IJSER >> Volume 2, Issue 11, November 2011
Electrical and Dielectric Properties of Aluminium Titanate
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C.Sudheendra, and T.Subba Rao
thermal expansion, electrical, dielectric, aluminium titanate.
Aluminum titanate (Al2TiO5) ceramics have a low thermal expansion coefficient, which results in excellent thermal shock resistance, low young's modulus, moderate strength, and low wettability by liquid metals. It is due to these properties that make the Al2TiO5 suitable for high-temperature applications where thermal shock resistance and thermal insulation is required, such as components of internal combustion engines, exhaust port liners, metallurgy and thermal barriers. Solid state diffusion method is the most commonly used for the preparation of titanates. X-ray diffraction and scanning electron microscopy (SEM) are the most commonly used techniques for the determination of crystal structure. Unit cell, cell parameters, crystallite size, stress, strain are the parameters that can be evaluated from the XRD data. Surface morphology i.e.grain size, grain boundaries, etc, dislocations, twin boundaries etc and the composition are the structural parameters that can be evaluated from the SEM and EDAX data. The Electrical conductivity and thermoelectric power measurements are used for understanding the conduction mechanism. The change of the dielectric constant (e) depends on the grain size affecting stress distribution in the grain. The grain size dependence of (e) has been investigated in ferroelectric materials.
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