Sintering behavior and microwave dielectric properties of CaTi1-x(Nb1/2Al1/2)xO3

Akbar Khan; Asif Ali; Izaz Khan

doi:10.53063/synsint.2021.1467

Akbar Khan ¹
Asif Ali ¹
Izaz Khan ¹

¹ Laboratory of Functional Materials and Devices, Department of Physics, Abdul Wali Khan University Mardan, 23200 KP, Pakistan

https://doi.org/10.53063/synsint.2021.1467

Abstract

CaTi_1-x(Nb_1/2Al_1/2)_xO₃ with x=0.1–0.5 ceramics were processed through solid state sintering. X-rays diffraction (XRD) patterns of the compositions showed that the samples have orthorhombic crystal structure with symmetry (Pbnm). The symmetry was further confirmed using Raman spectroscopy. A total of 13 Raman modes were detected, which were in agreement with the XRD results. Microstructure analysis of the samples showed porosity in the samples, presumably due to the substitution of Al, having high melting point. As the concentration of Al and Nb increased, relative permittivity (e_r), quality factor (Q×f_o) and temperature coefficient of resonance frequency decreased. Optimum microwave dielectric properties were achieved for the composition x=0.5 sintered at 1650 °C for 8 h i.e., e_r ~27.09, Q×f_o ~17378 GHz, and t_f~ -2.5 ppm/°C.

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Keywords: Perovskite, CaTiO3, Microwave dielectric properties

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