TY  - JOUR
T1  - Effective elastic properties for unpoled barium titanate
A1  - Dent,A.C.
A1  - Bowen,C.R.
A1  - Stevens,R.
A1  - Cain,M.G.
A1  - Stewart,M.
Y1  - 2007///
KW  - BaTiO3 and titanates
KW  - Mechanical properties
KW  - Actuators
KW  - Sensors
KW  - Unpoled ferroelectrics
KW  - Elastic modulus
KW  - Micromechanical model
SP  - 3739
EP  - 3743
JF  - Journal of the European Ceramic Society
JA  - J.Eur.Ceram.Soc.
VL  - 27
IS  - 13-15
PB  - Elsevier
N2  - Piezoelectric devices with complex electrode geometries may contain regions of ferroelectric material that remain unpoled. It is desirable to account for these non-piezoelectric regions for device optimization, since the unpoled and poled material properties differ. The lack of published elastic properties for unpoled ferroelectrics, specifically the numerous commercial PZT compositions, reflects the difficulty of experimental measurement. In this work, a method was developed to predict unpoled properties from more commonly available poled material data. Barium titanate was chosen for study as a representative ferroelectric, with both single crystal and polycrystalline (ceramic) properties available. Finite element micro-mechanical models were created with a focus on computational economy. This allowed larger ensembles of results to be computed, providing accurate effective compliances when averaged. The modelling methodology predicted the elastic properties for unpoled barium titanate to within ~10% of measured experimental values.
SN  - 0955-2219
M3  - doi:10.1016/j.jeurceramsoc.2007.02.031
UR  - http://dx.doi.org/10.1016/j.jeurceramsoc.2007.02.031
L2  - http://dx.doi.org/10.1016/j.jeurceramsoc.2007.02.031
ER  -