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Pressure Eect of Dielectric Property in Solid Solutions (1-x)Pb(Mg1=3Nb2=3)O3 - xPbZrO3
Hidehiro Ohwa,Naohiko Yasuda,Makoto Iwata,Hiroshi Orihara,Yoshihiro Ishibashi 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Dielectric properties of the solid solution system (1-x)Pb(Mg1=3Nb2=3)O3-xPbZrO3 have been studied under hydrostatic pressures up to 0.6 GPa. For the concentration of x 0:8, the values of the dielectric maximum and the temperature of the dielectric maximum decrease at the rate of about
Naohiko Yasuda,Hidehiro Ohwa,Makoto Iwata,Mituyoshi Matushita,Yohachi Yamashita,Yoshihiro Ishibashi,Yuuki Itoh 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
The piezoelectric properties of a Pb[(Zn1=3Nb2=3)0:91]Ti0:09O3 single crystal along the [001] direction in the rhombohedral phase were investigated under pressures of up to 500 MPa. The pressure dependence of electromechanical coupling factors in the k31 and k33 mode, k31 and k33, the resonance frequency fr and the antiresonance frequency fa, elastic compliances s11 E and s33 E, and the mechanical quality factor Qm are presented. The k31 decreases greatly with pressure, while the k33 decreases slightly.
Makoto Iwata,Hidehiro Ohwa,Ikuo Suzuki,Maeda Masaki,Naohiko Yasuda,Yoshihiro Ishibashi 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Domain-wall structures on an etched surface of the PZN-20 %PT crystal were investigated by the scanning probe microscopy (SPM). It was shown that 90 and 180 domain-wall structures can be observed. The surface charge due to the spontaneous polarization was detected by the electrostatic force microscopy (EFM). It was found that there exist complex 180 domain-wall structures with typical size of 1 m order on the (001)-crystal surface of the PZN-20 %PT.
Domain Observation in PIN-PT Mixed Crystal near a Morphotropic Phase Boundary
Naohiko Yasuda,Hidehiro Ohwa,Ikuo Suzuki,Makoto Iwata,Masaki Maeda,Naoya Uemura,Yohachi Yamashita,Yoshihiro Ishibashi 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Domain structrues in 0:72Pb(In1=2Nb1=2)O3-0.28PbTiO3[0.72PIN-0.28PT]mixed crystal was investigated by a polarized light microscopy. It was found that the (001) plate of 0.72PIN-0.28PT single crystal near a morphotropic phase boundary (MPB) exhibits complex domain structures, which consist of both the rhombohedral and the tetragonal phase intimately mixed together. The change in domain structures, re ecting the successive rhombohedral-tetragonal-cubic phase transition with heating was observed. The temperature dependence of the birefringence in 0.72PIN-0.28PT single crystal near a MPB was also presented. The change in domain structures in the (001) plate of 0.72PIN-0.28PT with the phase transition from rhombohedral to tetragonal ind훔
Naohiko Yasuda,Aritoshi Nakada,Hidehiro Ohwa,Ikuo Suzuki,Kazuhiko Fujita,Makoto Iwata,Masaki Maeda,Ryouko Ozao,Yoshihiro Ishibashi 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
The relation between polarization P and electric eld E in the solid solutions (1 .. x)Pb(Sc1=2Ta1=2)O3-xPbZrO3(PST-PZ) was investigated with the successive antiferroelectric (AFE) - ferroelectric(FE) - paraelectric(PE) phase transition with heating in the range of PZ compositions x > 0:8. It was found that P{E hysteresis loops change from the double P{E loop to the single one, re ecting the phase transition from AFE to FE. For the switching behavior in the AFE phase, it was found that the electric eld dependence of the reciprocal switching time and the peak switching current which characterize the switching transient consists of two parts ; one is the linear part at the high-eld region and the other is the curved part at the low-eld region.
The Effect of Pressure on the Poling Condition in Lead-based Relaxor Ferroelectric Solid Solutions
Naohiko Yasuda,Naoki Miyazono,Hidehiro Ohwa,Yoshihito Tachi,Yohachi Yamashita,Kazuhiko Fujita,Makoto Iwata,Yoshihiro Ishibashi 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
Topographic images for the domain structures of etched surfaces of PMNT ceramics were observed: ① Flattened fine domain structures with domains of about 50 nm or less in size along the poling direction due to the 180 domain reversal were seen in rhombohedral (74/26), (72/28), and (69/31) ceramics. ② Stereographical fine domain structures with projected domains of about 50 nm or less in size along some directions due to non-180˚ domain reversal, as well as 180˚ domain reversal were seen in the (67/33) ceramic near a MPB composition. Pressure-induced suppression of the electromechanical response occurred at the depoling pressure p_d = 590 MPa for PMNT (67/33) and at p_d = 400 MPa for PMNT (69/31). The poling for the PMNT (72/28) ceramic under a pressure of 600 MPa above pd was done under decreasing pressure at 10 kV/cm at room temperature. The resonance frequency fr and the antiresonance frequency fa decreased to f_r = 121.74 kHz and f_a = 124.03 kHz, the electromechanical coupling coefficient k31 decreased to 20.5%, and the maximum phase angle θ_m decreased to 12˚ compared to f_r = 131.32 kHz and f_a = 135.37 kHz, k31 = 26.8% and θ_m = 52˚ for normal poling. The topographic images of the etched surface of PMNT (72/28) poled under pressure was characterized with stereographical fine domain structures with projected domains of about 100 nm or less in size along some directions due to non-180 domain switching. A poling process using depoling pressure, as well as the well-known normal poling using depoling temperature, is applicable for ferroelectric materials.
Kenji Ohwada,Tatsuo Fukuda,Jun’ichiro Mizuki,Kazuma Hirota,Hikaru Terauchi,Satoshi Tsutsui,Alfred Q. R. Baron,Hidehiro Ohwa,Naohiko Yasuda 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
Pb(In_(1/2)Nb_(1/2))O_3 (PIN) can be antiferroelectric (AFE), ferroelectric (FE) or a relaxor depending upon the perovskite B-site randomness. In order to clarify the effect of B-site randomness, we studied the dynamics of ordered PIN without B-site randomness (O-PIN, AFE), which will give us a clear picture of the AFE/relaxor nature of the ground state due to B-site randomness. The quasielastic (QE) scattering shows a critical slowing down near the Γ-point and the transverse acoustic (TA) mode shows a softening trend at a finite wavenumber position (not at the Γ-point) towards the AFE phase transition temperature (T_N ∼ 450 K). On the other hand, the transverse optic (TO) mode shows a softening near the Γ-point toward low temperature with no clear anomaly at T_N. These results indicate that the AFE phase transition is associated with the TA mode and the origin of the QE scattering while a ferroelectric correlation exists behind the AFE ordering. The effect of B-site randomness is finally discussed on the basis of the results.