Layered perovskite structured La5-xSrxTi4+xSc1-xO17 microwave ceramics for dielectrically loaded antennas

作者：Muhammad Raz^*; Khesro Amir; Nicholls Simon J

来源：Ceramics International, 2016, 42(5): 6422-6427.

DOI：10.1016/j.ceramint.2016.01.048

• Microwave dielectric properties
• La5Ti4ScO17
• Dielectrically loaded antennae

The crystal structure, microstructure and dielectric properties of layered perovskite structured La5-xSrxTi4+xSc1-xO17 (x=0-0.8) ceramics prepared by a solid state reaction route were investigated. X-ray diffraction and Raman spectroscopy analysis revealed the formation of single phase orthorhombic (Pnnm) symmetry. The microwave dielectric properties (epsilon(r), Q x f(o) and TO of samples have been investigated as a function of composition. epsilon(r) and tau(f) increased while Q x f(o) decreased with an increase in x. The sample x=0.6 exhibited epsilon(r)=54.8, Q x f(o)=12,260 GHz and tau(f)=6.7 ppm/degrees C which may be a suitable candidate material for dielectrically loaded antenna applications. The complex impedance spectroscopy analysis of the sample x=0.6 revealed that the sample is highly insulative with two electro-active regions (bulk and grain boundary).

• 出版日期2016-4