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Structure-dielectric property relationship in Nb-doped ${Ca}_{4} {La}_{2} {Ti}_{5} O_{17}$ ceramics

Raz Muhammad

Department of Physics, Islamia College University, Peshawar 25120, KP, Pakistan

Materials Research Laboratory, Department of Physics, University of Peshawar, Peshawar 25120, KP, Pakistan

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and

Yaseen Iqbal

Materials Research Laboratory, Department of Physics, University of Peshawar, Peshawar 25120, KP, Pakistan

E-mail Address: dryaseeniqbal@yahoo.co.uk

Corresponding author.

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https://doi.org/10.1142/S0217979216501046Cited by:2 (Source: Crossref)

Abstract

A number of compounds in the ${Ca}_{4 + x} {La}_{2 - x} {Ti}_{5 - x} {Nb}_{x} O_{17}$ (x = 0–2) series were prepared through a mixed oxide solid-state sintering route. These compounds crystallized into orthorhombic (Pbnm) structure. The relative permittivity $(𝜀_{r})$ and temperature coefficient of resonance frequency $(τ_{f})$ depended on the polarizability of constituent cations while the quality factor $(Q \times f_{o})$ was affected by ordering of cations. These compounds exhibited promising $𝜀_{r}$ (74–90) and $Q \times f_{o}$ (10208–14116 GHz); however, the observed high $τ_{f}$ (157–542 ppm/ $^{\circ}$ C) requires further investigations to tune it through zero.

Keywords:

PACS: 77.22.Ch, 77.22.Ej, 77.22.Gm

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