Improvement in electrical and energy storage properties of lead-free BNKT-BT piezoceramics

Manlika  KAMNOY; Supalak  MANOTHAM; Pichitchai  BUTNOI; Sukum  EITSSAYEAM; Piewpan  PARJANSRI

doi:10.55713/jmmm.v35i3.2339

Authors

Manlika KAMNOY Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Supalak MANOTHAM Department of Metallurgical Technology, Faculty of Technical Education, Rajamangala University of Technology Krungthep, Bangkok 10120, Thailand
Pichitchai BUTNOI Department of Metallurgical Technology, Faculty of Technical Education, Rajamangala University of Technology Krungthep, Bangkok 10120, Thailand
Sukum EITSSAYEAM partment of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Piewpan PARJANSRI Physics Division, Faculty of Science and Technology, Rajamangala University of Technology Krungthep, Bangkok 10120, Thailand

DOI:

https://doi.org/10.55713/jmmm.v35i3.2339

Keywords:

Lead-free piezoelectric, dielectric constant, energy storage, BNKT-BT ceramic

Abstract

The electrical characteristics and energy storage performance of BNKT-BT lead-free piezoceramics were examined. All ceramics were produced via the mixed oxide technique. The findings indicated that the density of this ceramic system varied between 5.61 and 5.83 g/cm³. Conditions with 2.0 mol% (BT=0.02) and 6.0 mol% (BT=0.06) exhibited the largest dielectric constant (e_r) at both ambient temperature and elevated temperature, with values of 1307 and 4272, respectively. The ceramic sample with BT = 0.06 exhibited the highest values of %strain ~0.13 and a d*₃₃ ~179.65 pm/V. Furthermore, BT-doped ceramics yielded optimal energy storage densities compared to undoped BNKT ceramics. The sample containing 4.0 mol% (BT=0.04) reached the maximum energy storage density (W ~0.31 J/cm³) with an energy storage efficiency (η ~ 37.89%).

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