TY - JOUR
T1 - Thickness-dependent properties of relaxor-PbTiO3 ferroelectrics for ultrasonic transducers
AU - Lee, Hyeong Jae
AU - Zhang, Shujun
AU - Luo, Jun
AU - Li, Fei
AU - Shrout, Thomas R.
PY - 2010/9/23
Y1 - 2010/9/23
N2 - The electrical properties of Pb(Mg1/3Nb2/3)O 3-PbTiO3 (PMN-PT)-based polycrystalline ceramics and single crystals were investigated as a function of scale ranging from 500 μm to 30 μm. Fine-grained PMN-PT ceramics exhibited comparable dielectric and piezoelectric properties to their coarsegrained counterpart in the low frequency range (<10 MHz), but offered greater mechanical strength and improved property stability with decreasing thickness, corresponding to higher operating frequencies (>40 MHz). For PMN-PT single crystals, however, the dielectric and electromechanical properties degraded with decreasing thickness, while ternary Pb(In1/2Nb1/2)O3- Pb(Mg 1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT) exhibited minimal size-dependent behavior. The origin of property degradation of PMN-PT crystals was further studied by investigating the dielectric permittivity at high temperatures, and domain observations using optical polarized light microscopy. The results demonstrated that the thickness-dependent properties of relaxor-PT ferro- electrics are closely related to the domain size with respect to the associated macroscopic scale of the samples.
AB - The electrical properties of Pb(Mg1/3Nb2/3)O 3-PbTiO3 (PMN-PT)-based polycrystalline ceramics and single crystals were investigated as a function of scale ranging from 500 μm to 30 μm. Fine-grained PMN-PT ceramics exhibited comparable dielectric and piezoelectric properties to their coarsegrained counterpart in the low frequency range (<10 MHz), but offered greater mechanical strength and improved property stability with decreasing thickness, corresponding to higher operating frequencies (>40 MHz). For PMN-PT single crystals, however, the dielectric and electromechanical properties degraded with decreasing thickness, while ternary Pb(In1/2Nb1/2)O3- Pb(Mg 1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT) exhibited minimal size-dependent behavior. The origin of property degradation of PMN-PT crystals was further studied by investigating the dielectric permittivity at high temperatures, and domain observations using optical polarized light microscopy. The results demonstrated that the thickness-dependent properties of relaxor-PT ferro- electrics are closely related to the domain size with respect to the associated macroscopic scale of the samples.
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U2 - 10.1002/adfm.201000390
DO - 10.1002/adfm.201000390
M3 - Article
AN - SCOPUS:77957189197
VL - 20
SP - 3154
EP - 3162
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
IS - 18
ER -