Enhanced torsional actuation and stress coupling in Mn-modified 0.93(Na0.5Bi0.5TiO3)-0.07BaTiO(3) lead-free piezoceramic system

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Date

2017-01-01

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Taylor & Francis

Abstract

This paper is concerned with the development of a piezoelectric d15 shear-induced torsion actuator made of a lead-free piezoceramic material exhibiting giant piezoelectric shear stress coefficient (e15) and piezoelectric transverse shear actuation force comparable to that of leadbased shear-mode piezoceramics. The Mn-modified 0.93(Na0.5Bi0.5TiO3)-0.07BaTiO3 (NBT-BTMn) composition exhibited excellent properties as a torsional transducer with piezoelectric shear stress coefficient on the order of 11.6 C m–2. The torsional transducer, consisting of two oppositely polarized NBT-BT-Mn d15 mode piezoceramic shear patches, provided a rate of twist of 0.08 mm m–1 V–1 under quasi-static 150 V drive. The high value of piezoelectric shear d15 coefficient in NBT-BT-Mn sample further demonstrated its potential in practical applications. These results confirm that the lead-free piezoceramics can be as effective as their lead-based counterparts.

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Keywords

Technology, Materials Science, Multidisciplinary, Materials Science, Lead-free, piezoceramic, shear-mode, torsion, actuation, INDUCED FLEXURAL VIBRATIONS, CERAMICS, MECHANISM

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http://hdl.handle.net/10919/75216

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Scholarly Works, Center for Energy Harvesting Materials and Systems (CEHMS)
Scholarly Works, Mechanical Engineering