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Commercialization of Leisure : English Spa Towns in the Sixteenth and the Seventeenth Centuries
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Luminescence polarization of gold nanoclusters reveals directional self-assembly
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Short interval measurement of transient space charge distribution and electrical break down in polymer film in high temperature region
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최근 경제동향
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N-Phenyl-O-phenylthionocarbamate 유도체의 항균활성에 미치는 phenyl 치환기의 효과
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Cell Adhesion on the Surfaces of Chondroitin Sulfate-Based Hydrogels
- 검색키워드
- 저자 : Muangjai Unruan (검색결과 3 건)
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Anurak Prasatkhetragarn,Muangjai Unruan,Athipong Ngamjarurojana,Yongyut Laosiritaworn,Supon Ananta,Rattikorn Yimnirun,David P. Cann 한국물리학회 2009 Current Applied Physics Vol.9 No.4
The influences of Zr/Ti ratio on electrical properties of the 0.8Pb(ZrxTi1-x)O3–0.2Pb(Co1/3Nb2/3)O3 ceramics prepared by a mixed-oxide method (with x = 0.46, 0.48, 0.50, 0.52, and 0.54) have been investigated in order to identify the morphotropic phase boundary composition in this system. With XRD analysis, the crystal structure of dense specimens appeared to change gradually from tetragonal to rhombohedral with increasing Zr content. The dielectric properties measurements showed a maximum dielectric constant at x = 0.50, while the transition temperature decreased with increasing Zr content in the system. Moreover, all ceramics showed diffused phase transition behaviors with a minimum diffusivity at x = 0.50. In addition, the Polarization–Electric field (P–E) hysteresis loops of the ceramic systems also changed significantly with the Zr content. Interestingly, the loop squareness parameter reached maximum around x = 0.50. Other ferroelectric hysteresis parameters showed noticeable change at x = 0.50. These results clearly showed the significance of Zr/Ti ratio in controlling the electrical properties of the PZT–PCN ceramic systems. The influences of Zr/Ti ratio on electrical properties of the 0.8Pb(ZrxTi1-x)O3–0.2Pb(Co1/3Nb2/3)O3 ceramics prepared by a mixed-oxide method (with x = 0.46, 0.48, 0.50, 0.52, and 0.54) have been investigated in order to identify the morphotropic phase boundary composition in this system. With XRD analysis, the crystal structure of dense specimens appeared to change gradually from tetragonal to rhombohedral with increasing Zr content. The dielectric properties measurements showed a maximum dielectric constant at x = 0.50, while the transition temperature decreased with increasing Zr content in the system. Moreover, all ceramics showed diffused phase transition behaviors with a minimum diffusivity at x = 0.50. In addition, the Polarization–Electric field (P–E) hysteresis loops of the ceramic systems also changed significantly with the Zr content. Interestingly, the loop squareness parameter reached maximum around x = 0.50. Other ferroelectric hysteresis parameters showed noticeable change at x = 0.50. These results clearly showed the significance of Zr/Ti ratio in controlling the electrical properties of the PZT–PCN ceramic systems.
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Anurak Prasatkhetragarn,Muangjai Unruan,Athipong Ngamjarurojana,Yongyut Laosiritaworn,Supon Ananta,Rattikorn Yimnirun,David P. Cann 한국물리학회 2009 Current Applied Physics Vol.9 No.5
The influences of sintering conditions on electrical properties of the 0.8Pb(Zr1/2Ti1/2)O3–0.2Pb(Co1/3Nb2/ 3)O3 ceramics have been investigated with sintering temperatures of 1175, 1200, 1225, and 1250 ℃ and dwell times for 2, 6, and 10 h. The crystal structure of dense specimens showed coexistence between tetragonal, rhombohedral and pseudo cubic phases in all sintering temperatures, while tetragonal-rich phase appeared with increasing dwell times. A maximum dielectric constant was observed at sintering condition of 1200 ℃ for 2 h, while the transition temperature slightly increased with increasing dwell time. All ceramics also showed diffused phase transition behaviors with a minimum diffusivity at sintering condition of 1200 ℃ for 2 h. In addition, the polarization–electric field (P–E) hysteresis loops of the ceramic systems also changed significantly with sintering conditions. Interestingly, the ferroelectric parameters; remnant polarization (Pr) and loop squareness (Rsq) tended to increase with increasing sintering temperatures and dwell times. The influences of sintering conditions on electrical properties of the 0.8Pb(Zr1/2Ti1/2)O3–0.2Pb(Co1/3Nb2/ 3)O3 ceramics have been investigated with sintering temperatures of 1175, 1200, 1225, and 1250 ℃ and dwell times for 2, 6, and 10 h. The crystal structure of dense specimens showed coexistence between tetragonal, rhombohedral and pseudo cubic phases in all sintering temperatures, while tetragonal-rich phase appeared with increasing dwell times. A maximum dielectric constant was observed at sintering condition of 1200 ℃ for 2 h, while the transition temperature slightly increased with increasing dwell time. All ceramics also showed diffused phase transition behaviors with a minimum diffusivity at sintering condition of 1200 ℃ for 2 h. In addition, the polarization–electric field (P–E) hysteresis loops of the ceramic systems also changed significantly with sintering conditions. Interestingly, the ferroelectric parameters; remnant polarization (Pr) and loop squareness (Rsq) tended to increase with increasing sintering temperatures and dwell times.
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Ferroelectric properties of Pb(Zr1/2Ti1/2)O3–Pb(Zn1/3Nb2/3)O3 ceramics under compressive stress
Rattikorn Yimnirun,Narit Triamnak,Muangjai Unruan,Athipong Ngamjarurojana,Yongyut Laosiritaworn,Supon Ananta 한국물리학회 2009 Current Applied Physics Vol.9 No.1
Effects of compressive stress on the ferroelectric properties of ceramics in PZT–PZN system were investigated. The ceramics with a formula (1-x)Pb(Zr1/2Ti1/2)O3–xPb(Zn1/3Nb2/3)O3 or (1-x)PZT–(x)PZN (x = 0.1–0.5) were prepared by a conventional mixed-oxide method. The ferroelectric properties under the compressive stress of the PZT–PZN ceramics were observed at the stress levels up to 170 MPa using a compressometer in conjunction with a modified Sawyer–Tower circuit. It was found that with increasing compressive stress the area of the ferroelectric hysteresis (P–E) loops, the saturation polarization (Psat), the remnant polarization (Pr), and the coercive field (Ec) decreased. These results were interpreted through the non-180° ferroelastic domain switching processes. Effects of compressive stress on the ferroelectric properties of ceramics in PZT–PZN system were investigated. The ceramics with a formula (1-x)Pb(Zr1/2Ti1/2)O3–xPb(Zn1/3Nb2/3)O3 or (1-x)PZT–(x)PZN (x = 0.1–0.5) were prepared by a conventional mixed-oxide method. The ferroelectric properties under the compressive stress of the PZT–PZN ceramics were observed at the stress levels up to 170 MPa using a compressometer in conjunction with a modified Sawyer–Tower circuit. It was found that with increasing compressive stress the area of the ferroelectric hysteresis (P–E) loops, the saturation polarization (Psat), the remnant polarization (Pr), and the coercive field (Ec) decreased. These results were interpreted through the non-180° ferroelastic domain switching processes.
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