Effects of Sintering Temperatures on Structural, Electrical and Mechanical Properties of BNKT Piezoelectric Ceramics

Supalak Manotham; Pichitchai Butnoi; Narumon Lertcumfu; Pharatree Jaita

doi:10.4028/www.scientific.net/KEM.777.60

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 777Effects of Sintering Temperatures on Structural,...

Effects of Sintering Temperatures on Structural, Electrical and Mechanical Properties of BNKT Piezoelectric Ceramics

Abstract:

This research investigated the effects of sintering temperatures on the structural, dielectric, ferroelectric, piezoelectric and mechanical properties of lead-free Bismuth Sodium Potassium Titanate (BNKT) piezoelectric ceramics. The BNKT ceramics were prepared by solid-state mixed oxide method and sintering at temperature ranging from 1100 to 1150°C for 2 h. All ceramics sample showed highly density and reach a maximum at sintering temperature 1125°C of 5.81 g/cm³. X-ray diffraction patterns exhibited pure perovskite structure with coexisting of rhombohedral-tetragonal phases for all compositions. The microstructure was characterized by Scanning Electron Microscope (SEM), from SEM image the ceramics showed cubic-like grain shape. The average grain size increased with increasing sintering temperature. The dielectric permittivity showed the optimum sintering at 1125°C with reach a maximum dielectric constant of 4,194. Furthermore, at sintering temperature 1125°C present highest strain (S_max = 0.14%) with a large normalized strain coefficient (d*₃₃ = S_max/E_max) of 233 pm/V.

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Advanced Materials and Engineering Materials VII

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Key Engineering Materials (Volume 777)

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60-64

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https://doi.org/10.4028/www.scientific.net/KEM.777.60

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Online since:

August 2018

Authors:

Supalak Manotham*, Pichitchai Butnoi, Narumon Lertcumfu, Pharatree Jaita

Keywords:

BNKT, Piezoelectric Ceramics, Sintering Temperature

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