Structure and microwave dielectric properties of Ca0.66La0.387Ti0.88O3 ceramics
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Ca0.66La0.387Ti0.88O3 microwave dielectric ceramics were prepared via a mixed oxide solid state sintering route and characterized. X-ray diffraction revealed the formation of single phase Ca0.66La0.387Ti0.88O3 ceramics with orthorhombic (Pbnm) symmetry within the detection limit of the in-house XRD facility. Raman spectroscopy revealed the presence of seven Raman active bands evident of orthorhombic symmetry, in agreement with the present X-ray diffraction results. The microstructure of sintered samples appeared almost dense with some occasional pores. Ca0.66La0.387Ti0.88O3 exhibited reasonable relative permittivity (~71.5) and quality factor (~13,407 GHz); however, its temperature coefficient of resonance frequency was high (~136.4 × 10−6/°C) for commercial applications and requires further optimization.
KeywordsMicrowave Dielectric Property Dielectric Resonator Orthorhombic Symmetry Optimum Sinter Temperature Secondary Electron Scanning Electron Microscope
The laboratory support extended by Prof. I.M. Reaney and his group, Electro-ceramics Laboratory, Department of Material Science and Engineering, University of Sheffield (UK) for microwave properties measurements, is highly acknowledged. The authors acknowledge the financial support (ADP# 130314) of the Khyber Pakhtunkhwa Government through the Directorate of Science and Technology, KP for the up-gradation of Materials Research Laboratory, University of Peshawar.
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Conflict of interest
We have no potential conflict of interest.