Effect of CaO on Barium Zinc Tantalate (BZT) Dielectric Properties

Hidayani Jaafar, (2013) Effect of CaO on Barium Zinc Tantalate (BZT) Dielectric Properties. [Indexed Article]

Official URL: http://www.scientific.net/AMR.845.446

Abstract

The effect of CaO on microstructure and dielectric properties of Ba (Zn1/3Ta2/3)O3 (BZT) ceramics was investigated. The addition of CaO disturbed the 1:2 ordering to 1:1 ordering structure of BZT ceramic. The average grain size significantly increased with the addition of CaO and formed a more compacted structure. The relative density increased with the addition of a small amount of CaO, but it decreased when the CaO content was increased. The dielectric constant (ɛr) value of the BZT significantly improved with the addition of the CaO for the specimens sintered at 1250°C and it could be explained by the increased of the relative density. However, for the specimens sintered at 1300°C, the dielectric constant value decreased with the addition of CaO which is attributed to the decrease of the relative density. The tan δ of the CaO doped with BZT ceramics is lower than pure BZT ceramics, and decreases as the CaO content increases. Meanwhile, for the percentage of bandwidth (%BW) it is shown that the best result is when it is doped with 0.5 mol% CaO and sintered at 1250°C. The best microwave dielectric properties obtained are ɛr =70.44, tan δ = 0.025 which occur for the 0.5 mol% doped CaO and when sintered at 1250°C/4 h.

Item Type: Indexed Article
Subject Heading: Lime
Subject Heading: Dielectrics
Subject Heading: Specific gravity
Keywords: Barium Zinc Tantalate - Calcium Oxide - Dielectric Property - Phase Formation - Relative Density
Faculty: Faculty of Earth Sciences
Deposited By: En. Pahmi Abdullah
Date Deposited: 15 Dec 2013 07:03
Last Modified: 07 Mar 2016 06:38
URI: http://umkeprints.umk.edu.my/id/eprint/2442

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