Mechanical strain gradient generated electric polarization or flexoelectric effect was investigated in unpoled lead zirconate titanate (PZT) ceramics in the ferroelectric state by using a cantilevered beam based approach. Flexoelectric coefficient μ12 at room temperature was measured to be 1.4μC∕m in the PZT ceramic at small level of strain gradient. Temperature-dependent experimental investigations clearly showed that high dielectric permittivity in the ferroelectrics enhanced flexoelectric polarization: essentially a linear relation was found to exist between μ12 and dielectric susceptibility χ at lower permittivity level (2100–2800), while μ12 versus χ curve started to deviate from the straight line at the χ∼2800 and nonlinear enhancement of μ12 with χ was observed, with μ12 value reaching 9.5 at χ∼11000. The nonlinearity in the flexoelectric effect was associated with domain-related processes. It is suggested that flexoelectric effect can have a significant impact on epitaxial ferroelectric thin films and mesoscopic structures.Mechanical strain gradient generated electric polarization or flexoelectric effect was investigated in unpoled lead zirconate titanate (PZT) ceramics in the ferroelectric state by using a cantilevered beam based approach. Flexoelectric coefficient μ12 at room temperature was measured to be 1.4μC∕m in the PZT ceramic at small level of strain gradient. Temperature-dependent experimental investigations clearly showed that high dielectric permittivity in the ferroelectrics enhanced flexoelectric polarization: essentially a linear relation was found to exist between μ12 and dielectric susceptibility χ at lower permittivity level (2100–2800), while μ12 versus χ curve started to deviate from the straight line at the χ∼2800 and nonlinear enhancement of μ12 with χ was observed, with μ12 value reaching 9.5 at χ∼11000. The nonlinearity in the flexoelectric effect was associated with domain-related processes. It is suggested that flexoelectric effect can have a significant impact on epitaxial ferroelectric thin films...
[1]
A. Tagantsev,et al.
Room-temperature ferroelectricity in strained SrTiO3
,
2004,
Nature.
[2]
L. Eric Cross,et al.
Strain-gradient-induced electric polarization in lead zirconate titanate ceramics
,
2003
.
[3]
L. Eric Cross,et al.
Flexoelectric polarization of barium strontium titanate in the paraelectric state
,
2002
.
[4]
L. Eric Cross,et al.
Large flexoelectric polarization in ceramic lead magnesium niobate
,
2001
.
[5]
L. Eric Cross,et al.
Observation of the flexoelectric effect in relaxor Pb(Mg1/3Nb2/3)O3 ceramics
,
2001
.
[6]
M. Marvan,et al.
Flexoelectric effect in elastomers
,
1998
.
[7]
Gustau Catalan,et al.
The effect of flexoelectricity on the dielectric properties of inhomogeneously strained ferroelectric thin films
,
2004
.
[8]
A. Tagantsev,et al.
Effect of mechanical boundary conditions on phase diagrams of epitaxial ferroelectric thin films
,
1998
.
[9]
A. Tagantsev,et al.
Mechanical stress effect on imprint behavior of integrated ferroelectric capacitors
,
2003
.
[10]
P. Fuoss,et al.
Study of relaxed InxGa1−xAs epilayers on GaAs by grazing incidence x‐ray diffraction
,
1996
.
[11]
Leslie E. Cross,et al.
Possible piezoelectric composites based on the flexoelectric effect
,
1999
.
[12]
Bernard Jaffe,et al.
CHAPTER 12 – APPLICATIONS OF PIEZOELECTRIC CERAMICS
,
1971
.