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Microwave Dielectric Properties of (1-x)CaTiO₃-x(Na_0.5Nd_0.5)TiO₃ Ceramics

A.E. Reda, D.M. Ibrahim, D.A. Abdel Aziz

Journal of Ceramic Science and Technology, Vol. 7, No. 3 (2016), pp. 243-248

DOI: 10.4416/JCST2015-00083

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Abstract

The crystal structures, phase compositions and the microwave dielectric properties of (1-x)Ca2+TiO3 - x(Na1+0.5 Nd3+0.5)TiO3 ceramics prepared by the conventional solid state route have been investigated. The formation of solid solution is confirmed in XRD patterns. A specimen using 0.92Ca2+TiO3-0.08(Na1+0.5Nd3+0.5)TiO3 (x = 0.08) sintered at 1250 °C/2 h possesses an excellent combination of microwave dielectric properties, (εr) = 31.8, a maximum (Qxf) value of 2·104 at 5 GHz. This may be related to the increase in density as well as the grain morphology, which led to a reduction in the dielectric loss to a value of 0.25·10-3. It is proposed as a suitable candidate material for small-sized GPS patch antennas.

Keywords

Microwave, dielectric properties, calcium titanate, sodium neodymium titanate

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