Temperature‐Dependent Properties of (Bi1/2Na1/2)TiO3–(Bi1/2K1/2)TiO3–SrTiO3 Lead‐Free Piezoceramics

Journal of the American Ceramic Society - Tập 95 Số 7 - Trang 2241-2247 - 2012
Ke Wang1, Ali Hussain2, Wook Jo1, Jürgen Rödel1
1Institute of Materials Science, Technische Universität Darmstadt, Petersenstr. 23, 64287 Darmstadt, Germany
2Faculty of Materials Science and Engineering, GIK Institute of Engineering Sciences and Technology, Topi, KPK, Pakistan

Tóm tắt

Ferroelectric and piezoelectric properties of SrTiO3–modified (0, 3, and 5 mol%) 0.8Bi1/2Na1/2TiO3–0.2Bi1/2K1/2TiO3 lead‐free piezoceramics were investigated as a model system in an attempt to lay a guideline for developing lead‐free piezoelectric materials with large strains. Two guidelines, one for the choice of base composition and the other for the choice of chemical modifiers, were assumed from our current understanding of the mechanism involved. Dielectric permittivity of both poled and unpoled samples was measured and compared, leading to a conclusion that the frequency‐independent anomaly (TF‐R) is the temperature at which induced‐ferroelectric order converts back to relaxor state. The correlation between TF‐R and depolarization temperature (Td) was shown by the comparison with Td determined by thermally stimulated depolarization current measurements, whereas the ferroelectric‐relaxor transition temperature TF‐R was determined using poled samples. A large unipolar strain of 0.36% (Smax/Emax = 600 pm/V) at a driving field of 6 kV/mm was obtained at room temperature for a SrTiO3 content of 5 mol%. Temperature‐dependent measurements of both polarization and strain from room temperature to 200°C revealed that the origin of the large strain is due to a reversible field‐induced ergodic relaxor‐to‐ferroelectric phase transformation.

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Thông tin xuất bản

Journal of the American Ceramic Society

Tập 95 Số 7

2241-2247

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