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Takashi Iijima - One of the best experts on this subject based on the ideXlab platform.
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Design and ferroelectric properties of polar-axis-oriented polycrystalline Bi4−xPrxTi3O12 thick films on Ir/Si substrates
Applied Physics Letters, 2003Co-Authors: Hirofumi Matsuda, Sachiko Ito, Takashi IijimaAbstract:A route for polar-axis-oriented films with Bi4Ti3O12 (BIT)-type structure was presented. Bi4−xPrxTi3O12 (x=0.0, 0.3, 0.5, 0.7) films were grown on Ir/Si substrates from chemical solutions and formation of IrO2 from Ir layers fostered the nucleation of grains with a and b axes mixed orientation by lattice matching and pseudo-orthogonal c axes was aligned in-plane. Furthermore, by setting the heat treatment temperature for grain growth above the Curie temperature TC, the residual strain between the film and Si introduced lateral stress on cooling and aligned the ferroelectric polar axis separately along the film normal leaving the nonpolar axis in-plane. The polar-axis-oriented film exhibited superb ferroelectric properties with remanent and saturation polarizations of 2Pr=92 and Psat=50 μC/cm2 (x=0.3).
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design and ferroelectric properties of polar axis oriented polycrystalline bi4 xprxti3o12 thick films on ir si substrates
Applied Physics Letters, 2003Co-Authors: Hirofumi Matsuda, Sachiko Ito, Takashi IijimaAbstract:A route for polar-axis-oriented films with Bi4Ti3O12 (BIT)-type structure was presented. Bi4−xPrxTi3O12 (x=0.0, 0.3, 0.5, 0.7) films were grown on Ir/Si substrates from chemical solutions and formation of IrO2 from Ir layers fostered the nucleation of grains with a and b axes mixed orientation by lattice matching and pseudo-orthogonal c axes was aligned in-plane. Furthermore, by setting the heat treatment temperature for grain growth above the Curie temperature TC, the residual strain between the film and Si introduced lateral stress on cooling and aligned the ferroelectric polar axis separately along the film normal leaving the nonpolar axis in-plane. The polar-axis-oriented film exhibited superb ferroelectric properties with remanent and saturation polarizations of 2Pr=92 and Psat=50 μC/cm2 (x=0.3).
Hirofumi Matsuda - One of the best experts on this subject based on the ideXlab platform.
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Design and ferroelectric properties of polar-axis-oriented polycrystalline Bi4−xPrxTi3O12 thick films on Ir/Si substrates
Applied Physics Letters, 2003Co-Authors: Hirofumi Matsuda, Sachiko Ito, Takashi IijimaAbstract:A route for polar-axis-oriented films with Bi4Ti3O12 (BIT)-type structure was presented. Bi4−xPrxTi3O12 (x=0.0, 0.3, 0.5, 0.7) films were grown on Ir/Si substrates from chemical solutions and formation of IrO2 from Ir layers fostered the nucleation of grains with a and b axes mixed orientation by lattice matching and pseudo-orthogonal c axes was aligned in-plane. Furthermore, by setting the heat treatment temperature for grain growth above the Curie temperature TC, the residual strain between the film and Si introduced lateral stress on cooling and aligned the ferroelectric polar axis separately along the film normal leaving the nonpolar axis in-plane. The polar-axis-oriented film exhibited superb ferroelectric properties with remanent and saturation polarizations of 2Pr=92 and Psat=50 μC/cm2 (x=0.3).
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design and ferroelectric properties of polar axis oriented polycrystalline bi4 xprxti3o12 thick films on ir si substrates
Applied Physics Letters, 2003Co-Authors: Hirofumi Matsuda, Sachiko Ito, Takashi IijimaAbstract:A route for polar-axis-oriented films with Bi4Ti3O12 (BIT)-type structure was presented. Bi4−xPrxTi3O12 (x=0.0, 0.3, 0.5, 0.7) films were grown on Ir/Si substrates from chemical solutions and formation of IrO2 from Ir layers fostered the nucleation of grains with a and b axes mixed orientation by lattice matching and pseudo-orthogonal c axes was aligned in-plane. Furthermore, by setting the heat treatment temperature for grain growth above the Curie temperature TC, the residual strain between the film and Si introduced lateral stress on cooling and aligned the ferroelectric polar axis separately along the film normal leaving the nonpolar axis in-plane. The polar-axis-oriented film exhibited superb ferroelectric properties with remanent and saturation polarizations of 2Pr=92 and Psat=50 μC/cm2 (x=0.3).
Sachiko Ito - One of the best experts on this subject based on the ideXlab platform.
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Design and ferroelectric properties of polar-axis-oriented polycrystalline Bi4−xPrxTi3O12 thick films on Ir/Si substrates
Applied Physics Letters, 2003Co-Authors: Hirofumi Matsuda, Sachiko Ito, Takashi IijimaAbstract:A route for polar-axis-oriented films with Bi4Ti3O12 (BIT)-type structure was presented. Bi4−xPrxTi3O12 (x=0.0, 0.3, 0.5, 0.7) films were grown on Ir/Si substrates from chemical solutions and formation of IrO2 from Ir layers fostered the nucleation of grains with a and b axes mixed orientation by lattice matching and pseudo-orthogonal c axes was aligned in-plane. Furthermore, by setting the heat treatment temperature for grain growth above the Curie temperature TC, the residual strain between the film and Si introduced lateral stress on cooling and aligned the ferroelectric polar axis separately along the film normal leaving the nonpolar axis in-plane. The polar-axis-oriented film exhibited superb ferroelectric properties with remanent and saturation polarizations of 2Pr=92 and Psat=50 μC/cm2 (x=0.3).
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design and ferroelectric properties of polar axis oriented polycrystalline bi4 xprxti3o12 thick films on ir si substrates
Applied Physics Letters, 2003Co-Authors: Hirofumi Matsuda, Sachiko Ito, Takashi IijimaAbstract:A route for polar-axis-oriented films with Bi4Ti3O12 (BIT)-type structure was presented. Bi4−xPrxTi3O12 (x=0.0, 0.3, 0.5, 0.7) films were grown on Ir/Si substrates from chemical solutions and formation of IrO2 from Ir layers fostered the nucleation of grains with a and b axes mixed orientation by lattice matching and pseudo-orthogonal c axes was aligned in-plane. Furthermore, by setting the heat treatment temperature for grain growth above the Curie temperature TC, the residual strain between the film and Si introduced lateral stress on cooling and aligned the ferroelectric polar axis separately along the film normal leaving the nonpolar axis in-plane. The polar-axis-oriented film exhibited superb ferroelectric properties with remanent and saturation polarizations of 2Pr=92 and Psat=50 μC/cm2 (x=0.3).
Yalcin M Ertekin - One of the best experts on this subject based on the ideXlab platform.
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vertical machining center accuracy characterization using laser interferometer part 1 linear positional errors
Journal of Materials Processing Technology, 2000Co-Authors: Anthony Chukwujekwu Okafor, Yalcin M ErtekinAbstract:Abstract This paper presents the results of accuracy characterization of a Vertical Machining Center (VMC) in the form of linear errors and temperature variation using a low powered He–Ne laser (Renishaw ® ) calibration system along with environmental controller unit. The machine investigated is Cincinnati Milacron Sabre 750 three axes CNC VMC with Acramatic 2100 CNC open architecture controller. Temperature distribution of the machine was measured using three temperature sensors strategically attached to predetermined locations on each axis guides. The accuracy of the VMC is characterized in the form of geometric and thermal errors as a function of machine tool nominal axis position, temperature distribution and environmental effect (air temperature, air pressure and relative humidity). Results show that axis drive motors are the major heat sources. Linear positional accuracy is best when the machine is in cold condition and deteriorates with increasing machine operation time for all three axes. X -axis had worst linear displacement accuracy and maximum reversal errors among the three axes being tested.
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vertical machining center accuracy characterization using laser interferometer part 2 angular errors
Journal of Materials Processing Technology, 2000Co-Authors: Anthony Chukwujekwu Okafor, Yalcin M ErtekinAbstract:Abstract This paper presents the results of accuracy characterization of a vertical machining center (VMC) in the form of angular errors and temperature variation using a low powered He–Ne (Renishaw ® ) laser calibration system along with environmental controller unit. The machine investigated is Cincinnati Milacron Sabre 750 3-axes VMC with Acramatic 2100 CNC open architecture controller. During angular error measurements, pitch and yaw errors of the X -, Y - and Z -axes were obtained. The accuracy of the VMC is characterized in the form of geometric and thermal errors as a function of machine tool nominal axis position, temperature distribution and environmental effect (air temperature, air pressure and relative humidity). The measured temperatures in conjunction with the geometric models are used to predict machine tool geometric and thermal errors. Results show that axis drive motors are the major heat sources. X -, Y - and Z -axes pitch errors are all sinusoidal in nature with an approximate wavelength of 4 in. X -axis pitch and Y -axis yaw errors are highest angular errors of the VMC.
Shudong Yu - One of the best experts on this subject based on the ideXlab platform.
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error calibration of controlled rotary pairs in five axis machining centers based on the mechanism model and kinematic invariants
International Journal of Machine Tools & Manufacture, 2017Co-Authors: Zhi Wang, Delun Wang, Yu Wu, Huimin Dong, Shudong YuAbstract:Abstract The mechanism model of ball bar testing for a two-axis rotary table of 5-axis machining center is discussed, and a new ball bar method to measure the three-dimensional motions of the rotary pairs in multi-axis machining center is developed based on the mechanism model. Then, the fixed axes and moving axes of the rotary pairs are identified by using spherical image circle fitting and striction circle fitting, according to the kinematic invariants of nominal rotation and the measured motions. The structure errors and kinematic pair errors of the rotary pairs are defined and identified by using the fixed and moving axes, and the kinematic model of the two-axis rotary table is deduced with those errors. The simultaneous two-axis motions of the rotary table are measured to verify the proposed calibration method. The experimental results show good agreements with the predicted results calculated by the calibrated kinematic model. Furthermore, the accuracy of the simultaneous multi-axis motions of the machining center is improved when the identified errors are corrected.
