Potassium sodium niobate (KNN) is one of the most promising Pb-free piezo-ceramics. In the present work, KNN was produced by fast-firing with different cooling strategies, i.e., fast and slow cooling. Dielectric, ferroelectric, and piezoelectric properties of fast-fired pellets were determined and compared with those of conventional-sintered products. Although the samples produced by fast-firing had higher density than those obtained by conventional sintering, fast-cooled samples following fast firing show relatively low electrical properties. When fast-firing was combined with slow cooling, the electrical properties, especially piezoelectric d33 values, were improved. The material subjected to fast-firing at 1120 °C using slow cooling gave the highest relative density (about 95 %) with fine grains microstructure and a d33 of 112 pC/N whereas that produced by conventional sintering resulted in d33 of 80 pC/N with a relative density of 88 % for the same dwell time (30 min).

Fast-firing of potassium sodium niobate (KNN) / Karacasulu, Levent; Karakaya, Merve; Adem, Umut; Sglavo, Vincenzo M.; Biesuz, Mattia; Vakifahmetoglu, Cekdar. - In: OPEN CERAMICS. - ISSN 2666-5395. - 17:(2024), p. 100541. [10.1016/j.oceram.2024.100541]

Fast-firing of potassium sodium niobate (KNN)

Karacasulu, Levent
Primo
;
Sglavo, Vincenzo M.;Biesuz, Mattia
Penultimo
;
2024-01-01

Abstract

Potassium sodium niobate (KNN) is one of the most promising Pb-free piezo-ceramics. In the present work, KNN was produced by fast-firing with different cooling strategies, i.e., fast and slow cooling. Dielectric, ferroelectric, and piezoelectric properties of fast-fired pellets were determined and compared with those of conventional-sintered products. Although the samples produced by fast-firing had higher density than those obtained by conventional sintering, fast-cooled samples following fast firing show relatively low electrical properties. When fast-firing was combined with slow cooling, the electrical properties, especially piezoelectric d33 values, were improved. The material subjected to fast-firing at 1120 °C using slow cooling gave the highest relative density (about 95 %) with fine grains microstructure and a d33 of 112 pC/N whereas that produced by conventional sintering resulted in d33 of 80 pC/N with a relative density of 88 % for the same dwell time (30 min).
2024
Karacasulu, Levent; Karakaya, Merve; Adem, Umut; Sglavo, Vincenzo M.; Biesuz, Mattia; Vakifahmetoglu, Cekdar
Fast-firing of potassium sodium niobate (KNN) / Karacasulu, Levent; Karakaya, Merve; Adem, Umut; Sglavo, Vincenzo M.; Biesuz, Mattia; Vakifahmetoglu, Cekdar. - In: OPEN CERAMICS. - ISSN 2666-5395. - 17:(2024), p. 100541. [10.1016/j.oceram.2024.100541]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/401709
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