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Effect of annealing time on structural and microwave dielectric characteristics of Li2ZnTi3O8 ceramics

Published online by Cambridge University Press:  11 May 2015

Hamid Taghipour-Armaki ,
Ehsan Taheri-Nassaj Open the ORCID record for Ehsan Taheri-Nassaj [Opens in a new window]  and
Maryam Bari
Hamid Taghipour-Armaki
Affiliation:
Department of Materials Science and Engineering, Tarbiat Modares University, Tehran 14115–143, Iran
Ehsan Taheri-Nassaj*
Affiliation:
Department of Materials Science and Engineering, Tarbiat Modares University, Tehran 14115–143, Iran
Maryam Bari
Affiliation:
Department of Materials Science and Engineering, Tarbiat Modares University, Tehran 14115–143, Iran
*
a)Address all correspondence to this author. e-mail: taheri@modares.ac.ir
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Abstract

In the present work, the Li2ZnTi3O8 ceramics were prepared via the solid-state reaction method, afterward annealed at 800 °C in a time variation from 4 to 20 h. The ordering, microstructures and dielectric properties were investigated using x-ray diffraction, scanning electron microscopy, network analyzer, and Raman spectroscopy. The most significant enhancement of quality factor is obtained in the sample annealed for 20 h, while the dielectric constant and temperature coefficient of resonant frequency change slightly. This result mainly attributes to the enhancement of ordering, which could be related to the increase in the Zn–O bond strength in ZnO4 tetrahedra. Meanwhile, the full-width at half-maximum of A1g mode decreased with higher annealing time, which suggested less variation in the Zn–O bond length and a higher degree of ordering. The best combination of microwave dielectric characteristic is obtained in the sample annealed at 800 °C for 20 h: Q × f = 112,400 GHz, εr = 24.500, and τf = −11 ppm/°C.

Keywords

ceramicannealingdielectric properties
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 10 , 28 May 2015 , pp. 1619 - 1628
Copyright
Copyright © Materials Research Society 2015 

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