Exceptionally large piezoelectric strains in BiFeO3–(K0.5Bi0.5)TiO3–PbTiO3 ceramics

Samples of (1−x−y)BiFeO3–x(K0.5Bi0.5)TiO3–yPbTiO3, where x=0.15 and y=0.275, were produced via a conventional mixed oxide method. Ceramics were characterized using X-ray diffraction, confirming an electric-field-induced phase change from predominantly rhombohedral to mixed phase tetragonal and rhomb...

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Bibliographic Details
Published in:Scripta materialia 2013-04, Vol.68 (7), p.491-494
Main Authors: Bennett, J., Bell, A.J., Stevenson, T.J., Comyn, T.P.
Format: Article
Language:English
Subjects:
Ceramics
Deoxidizing
Ferroelectric ceramics
Mixed oxides
Oxides
Perovskite
Phase change
Phase transformations
Piezoelectricity
Strain
X-ray diffraction (XRD)
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Summary:Samples of (1−x−y)BiFeO3–x(K0.5Bi0.5)TiO3–yPbTiO3, where x=0.15 and y=0.275, were produced via a conventional mixed oxide method. Ceramics were characterized using X-ray diffraction, confirming an electric-field-induced phase change from predominantly rhombohedral to mixed phase tetragonal and rhombohedral structure upon poling. There was a remnant polarization of 34μCcm−2 and a total strain of 0.805% at 6.5kVmm−1, the highest electric-field-induced strain reported in a polycrystalline material. A d33 of 205pmV−1 was measured and Rayleigh analysis was used to quantify the extrinsic contributions.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2012.11.029