Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 23, Issue 47, Pages 5881-5886Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201300899
Keywords
nanocomposites; self-assembly; piezoelectrics; auxetic materials
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Funding
- European Research Council (ERC) [ERC-2009-AdG-247276-NOVOX]
- U.S. National Science Foundation [NSF 1007969]
- EPSRC [EP/H047867/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H047867/1] Funding Source: researchfish
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Unimorph cantilevers are made from 0.5BaTiO(3)-0.5Sm(2)O(3) (BTO-SmO) self-assembled vertical heteroepitaxial nanocomposite thin films, grown by PLD on (001) SrTiO3 single crystal substrates. The films remain piezoelectric up to at least 250 degrees C without losing any actuation. The longitudinal piezoelectric coefficient, d(33), is approximate to 45 to 50 pm V-1 measured from room temperature to 250 degrees C. The transverse piezoelectric coefficient, d(31), a key parameter of actuator performance, exceeds PZT (Pb1-xZrxTiO3) films at >200 pm V-1. Since the d(31) coefficient was found to be positive, this opens up exciting new applications opportunities. The possible reasons for d(31) > 0 are discussed in the light of 3D strain control in the nanocomposites.
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