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

Jaafar Hidayani

doi:10.4028/www.scientific.net/AMR.845.446

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 845Effect of CaO on Barium Zinc Tantalate (BZT)...

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

Abstract:

The effect of CaO on microstructure and dielectric properties of Ba (Zn_1/3Ta_2/3)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 (ɛ_r) 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 ɛ_r=70.44, tan δ = 0.025 which occur for the 0.5 mol% doped CaO and when sintered at 1250°C/4 h.

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Periodical:

Advanced Materials Research (Volume 845)

Pages:

446-450

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.845.446

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Online since:

December 2013

Authors:

Jaafar Hidayani*

Keywords:

Barium Zinc Tantalate, Calcium Oxide, Dielectric Property, Phase Formation, Relative Density

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