Effect of Sintering Temperature on Structure and Dielectric Properties of Lead Free K0.5Na0.5NbO3 Prepared via Hot Isostatic Pressing

Fatin Khairah Bahanurdin; Julie Juliewatty Mohamed; Zainal Arifin Ahmad

doi:10.4028/www.scientific.net/MSF.888.42

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HomeMaterials Science ForumMaterials Science Forum Vol. 888Effect of Sintering Temperature on Structure and...

Effect of Sintering Temperature on Structure and Dielectric Properties of Lead Free K_0.5Na_0.5NbO₃ Prepared via Hot Isostatic Pressing

Abstract:

In this research, alkaline niobate known as K_0.5Na_0.5NbO₃ (KNN) lead-free piezoelectric ceramic was synthesis by solid state reaction method which pressing at different sintering temperatures (1000 °C and 1080 °C) prepared via hot isostatic pressing (HIP)). The effect of sintering temperature on structure and dielectric properties was studied. The optimum sintering temperature (at 1080 °C for 30 minutes) using hot isostatic pressing (HIP) was successfully increase the density, enlarge the particle grain size in the range of 0.3 µm – 2.5 µm and improves the dielectric properties of K_0.5Na_0.5NbO₃ ceramics. The larger grain size and higher density ceramics body will contribute the good dielectric properties. At room temperature, the excellent relative permittivity and tangent loss recorded at 1 MHz (ɛ_r = 5517.35 and tan δ = 0.954), respectively for KNN1080HIP sample. The KNN1080HIP sample is also exhibits highest relative density which is 4.485 g/cm³. The ɛ_r depends upon density and in this work, the density increase as the sintering temperature increase, which resulting the corresponding ɛ_rvalue also increases.

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Periodical:

Materials Science Forum (Volume 888)

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42-46

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.888.42

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Online since:

March 2017

Authors:

Fatin Khairah Bahanurdin, Julie Juliewatty Mohamed, Zainal Arifin Ahmad*

Keywords:

Dielectric Properties, Hot Isostatic Pressing, KNN, Sintering Temperature

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