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

  • Akbar Khan Laboratory of Functional Materials and Devices, Department of Physics, Abdul Wali Khan University Mardan, 23200 KP, Pakistan
  • Asif Ali Laboratory of Functional Materials and Devices, Department of Physics, Abdul Wali Khan University Mardan, 23200 KP, Pakistan
  • Izaz Khan Laboratory of Functional Materials and Devices, Department of Physics, Abdul Wali Khan University Mardan, 23200 KP, Pakistan
DOI: https://doi.org/10.53063/synsint.2021.1467

Abstract

CaTi1-x(Nb1/2Al1/2)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 (er), quality factor (Q×fo) 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., er ~27.09, Q×fo ~17378 GHz and tf ~ -2.5 ppm/°C.

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Keywords: Perovskite, CaTiO3, Microwave dielectric properties
Sintering behavior and microwave dielectric properties of CaTi1-x(Nb1/2Al1/2)xO3
Submitted
2021-10-09
Published
2021-11-09
How to Cite
Khan, A., Ali, A., & Khan, I. (2021). Sintering behavior and microwave dielectric properties of CaTi1-x(Nb1/2Al1/2)xO3. Synthesis and Sintering, 1(4), 197-201. https://doi.org/10.53063/synsint.2021.1467
Issue
Vol. 1 No. 4 (2021)
Section
Articles

Copyright (c) 2021 Akbar Khan, Asif Ali, Izaz Khan

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