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Structure and Electrical Properties of BNKT-Based Ceramics

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Abstract:

In this work, the properties of lead-free 0.92(Bi0.5Na0.42K0.08)TiO3-0.08(BaNb0.01Ti0.99)O3 or 92BNKT-8BNbT ceramic has been investigated. The sample was fabricated by a solid-state reaction technique. The 92BNKT-8BNbT sample was well sintered and dense with high density value of 5.86 g/cm3. X-Ray diffraction (XRD) patterns showed a single perovskite phase with tetragonal symmetry and no impurity or secondary phases. The microstructure was analysed using a scanning electron microscopy (SEM). Average grain size was measured and calculated based on a mean linear intercept method. The ceramics had a cubic-like grain shape with an average grain size of 0.39 µm. The influence of temperature on the dielectric and ferroelectric properties of the ceramic was investigated. The dielectric curves exhibited broad transition peaks at Td and Tm, which were the characteristics of a diffuse phase transition. The polarization-electric field (P-E) hysteresis loop changed from well-saturated at room temperature (RT) to pinched-type loop at high temperature (HT) and the remanent polarization decreased from 21.25 µC/cm2 (at RT) to 5.96 µC/cm2 (at 150 °C).

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Periodical:

Solid State Phenomena (Volume 283)

Pages:

147-153

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.283.147

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Online since:

September 2018

Authors:

Supalak Manotham*, Pichitchai Butnoi, Pharatree Jaita, Tawee Tunkasiri

Keywords:

BNKT, Electrical Properties, High Temperature, Piezoelectric Ceramics

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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