Dielectric and piezoelectric properties for 0.62Pb(Mg 1/3Nb 2/3)O 3–0.38PbTiO 3 single crystals
The dielectric and piezoelectric properties of 0.62Pb(Mg 1/3Nb 2/3)O 3–0.38PbTiO 3 single crystal (PMNT62/38) were investigated in this work. Power X-ray diffraction demonstrated PMNT62/38 had a tetragonal structure at room temperature. The Curie temperature was 187 °C on heating. The poled and as-g...
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Published in | Ceramics international Vol. 29; no. 2; pp. 145 - 150 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
2003
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Subjects | |
Online Access | Get full text |
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Summary: | The dielectric and piezoelectric properties of 0.62Pb(Mg
1/3Nb
2/3)O
3–0.38PbTiO
3 single crystal (PMNT62/38) were investigated in this work. Power X-ray diffraction demonstrated PMNT62/38 had a tetragonal structure at room temperature. The Curie temperature was 187 °C on heating. The poled and as-grown dielectric constants
ε
r of [001] oriented PMNT62/38 at room temperature were ∼500 and ∼5000, respectively. The remanent polarization
P
r and coercive field
E
c for [001] oriented one were 34.2 μC/cm
2 and 8.25 kV/cm, respectively. The strain at 15 kV/cm and −15k V/cm were 0.078 and 0.125%, respectively. The piezoelectric constant
d
33 was ∼350 pC/N. The electromechanical coupling coefficients; 0.89 of
k
33, 0.61 of
k
t, 0.46 of
k
31 and 0.45 of
k
15 were calculated from measured resonance and anti-resonance frequencies by impedance resonance techniques. In single domain process it was found the re-oriented domains of [001] poled PMNT62/38 were instable, which caused it hard to align the spontaneous polarizations to create a single domain crystal. |
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ISSN: | 0272-8842 1873-3956 |
DOI: | 10.1016/S0272-8842(02)00098-6 |