期刊
ADVANCED FUNCTIONAL MATERIALS
卷 23, 期 33, 页码 4079-4086出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201203754
关键词
lead-free materials; piezoceramics; temperature-insensitive materials; strain
类别
资金
- Alexander von Humboldt foundation
- National Nature Science Foundation of China [51211140345]
- 973 Program [2009CB623304]
The development of lead-free piezoceramics has attracted great interest because of growing environmental concerns. A polymorphic phase transition (PPT) has been utilized in the past to tailor piezoelectric properties in lead-free (K,Na)NbO3 (KNN)-based materials accepting the drawback of large temperature sensitivity. Here a material concept is reported, which yields an average piezoelectric coefficientd(33) of about 300 pC/N and a high level of unipolar strain up to 0.16% at room temperature. Most intriguingly, field-induced strain varies less than 10% from room temperature to 175 degrees C. The temperature insensitivity of field-induced strain is rationalized using an electrostrictive coupling to polarization amplitude while the temperature-dependent piezoelectric coefficient is discussed using localized piezoresponse probed by piezoforce microscopy. This discovery opens a new development window for temperature-insensitive piezoelectric actuators despite the presence of a polymorphic phase transition around room temperature.
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