Phases and Domain Structures in Relaxor-Based Ferroelectric (PbMg1/3Nb2/3O3)0.69(PbTiO3)0.31 Single Crystal

概要

論文の詳細を見る
The Brillouin back-scattering spectra, dielectric permittivities, polarization–electric field ($P$–$E$) hysteresis loops and domain structures have been measured as a function of temperature in a relaxor-based ferroelectric single crystal (PbMg1/3Nb2/3O3)0.69(PbTiO3)0.31 (PMN–31%PT). In order of increasing temperature, PMN–31%PT undergoes successive phase transitions: $\text{rhombohedral phase} (\text{below} \sim 370\,\text{K}) \rightarrow \text{coexistence of rhombohedral and tetragonal phases}$ \linebreak $(\text{between} \sim 370 \text{and} \sim 380\,\text{K}) \rightarrow \text{tetragonal phase} (\text{between} \sim 380 \text{and} \sim 400\,\text{K}) \rightarrow \text{coexistence of tetragonal and cubic}$ \linebreak $\text{phases} (\text{betwee} \sim 400 \text{and} \sim 420\,\text{K}) \rightarrow \text{cubic phase} (\text{above} \sim 420\,\text{K})$. An extra ferroelectric anomaly of the dielectric permittivity appears at 370 K possibly due to the percolating polar cluster induced by an external electric field. It was found that different individual domain regions have different transition temperatures. This phenomenon suggests an inhomogeneous distribution of Ti4+ concentration in the PMN–31%PT crystal. The dielectric permittivity $\varepsilon^{\prime}$ of PMN–31%PT obeys the empirical relation, $\varepsilon^{\prime}_{\text{m}}/\varepsilon^{\gamma}(f,T)=1+[T-T_{\text{m}}(f)]^{\prime}/2\delta_{\gamma}^{2}$, above the temperature of permittivity maximum $T_{\text{m}}$.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
2001-06-15

Phases and Domain Structures in Relaxor-Based Ferroelectric (PbMg1/3Nb2/3O3)0.69(PbTiO3)0.31 Single Crystal

スポンサーリンク

概要

著者

関連論文

スポンサーリンク