A promising method of ferroelectric domain inverted structures was demonstrated, which allows us to fabricate thicker domain inverted patterns by applying a lower external electric field in LiTaO3 crystal. The externa...A promising method of ferroelectric domain inverted structures was demonstrated, which allows us to fabricate thicker domain inverted patterns by applying a lower external electric field in LiTaO3 crystal. The external field for the domain reversal of the 1.5 mm thick LiTaO3 at 500 ℃ was only 6 V·mm-1, which is lower by three orders of magnitude than that in LiTaO3 crystal at room temperature. The process of the domain inversion structure was also studied. The fabrication techniques are based on controlled temperature and field duration time.展开更多
As an important multi-functional material applied in surface acoustic wave devices, optical communications,laser and optoelectronics due to its good photoelectric and piezoelectric properties, lithium tantalate (LiTaO...As an important multi-functional material applied in surface acoustic wave devices, optical communications,laser and optoelectronics due to its good photoelectric and piezoelectric properties, lithium tantalate (LiTaO3) hasdrawn extensive interests[1]. Numerous physical properties of LiTaO3, such as acoustical, electronic structures,optical properties and effective mass, thermodynamic properties, have been reported in several papers.Point defects will affect the electronic structure which should be responsible for many physical properties,especially optical properties.展开更多
The inhomogeneity in a congrunet LiTaO3 crystal has been observed by transmission synchrotron topography.Many extraordinary regions exist in congruent LiTaO3 crystal and they often show diffraction intensity different...The inhomogeneity in a congrunet LiTaO3 crystal has been observed by transmission synchrotron topography.Many extraordinary regions exist in congruent LiTaO3 crystal and they often show diffraction intensity different from that of ordinary regions in synchrotron topographs.Differential thermal analysis indiates that the Curie temperature of the extraordinary region is lower than that of ordinary region,and the extraordinary region is really a high defect density region.The diffraction contrast of the extraordinary region in synchrotron topographs is explained qualitatively by a calculation at the selected wavelength.2001 Published by Elsevier Science B.V.展开更多
通过冷等静压成型空气气氛下无压烧结把 L i Ta O3压电陶瓷颗粒作为增韧相引入 Al2 O3结构陶瓷 ,结果发现 ,L i Ta O3与 Al2 O3在 130 0℃烧结后能稳定共存 ,L i Ta O3颗粒弥散均匀分布 ;L i Ta O3的加入改善了 Al2 O3陶瓷的烧结性能 ;L...通过冷等静压成型空气气氛下无压烧结把 L i Ta O3压电陶瓷颗粒作为增韧相引入 Al2 O3结构陶瓷 ,结果发现 ,L i Ta O3与 Al2 O3在 130 0℃烧结后能稳定共存 ,L i Ta O3颗粒弥散均匀分布 ;L i Ta O3的加入改善了 Al2 O3陶瓷的烧结性能 ;L i Ta O3颗粒含量适中的 Al2 O3基陶瓷复合材料的力学性能显著提高。展开更多
基金Project supported by the National Natural Science Foundation of China (60544004,90501004) and Program for Changjiang Scholars and Innovative Research Team in University
文摘A promising method of ferroelectric domain inverted structures was demonstrated, which allows us to fabricate thicker domain inverted patterns by applying a lower external electric field in LiTaO3 crystal. The external field for the domain reversal of the 1.5 mm thick LiTaO3 at 500 ℃ was only 6 V·mm-1, which is lower by three orders of magnitude than that in LiTaO3 crystal at room temperature. The process of the domain inversion structure was also studied. The fabrication techniques are based on controlled temperature and field duration time.
文摘As an important multi-functional material applied in surface acoustic wave devices, optical communications,laser and optoelectronics due to its good photoelectric and piezoelectric properties, lithium tantalate (LiTaO3) hasdrawn extensive interests[1]. Numerous physical properties of LiTaO3, such as acoustical, electronic structures,optical properties and effective mass, thermodynamic properties, have been reported in several papers.Point defects will affect the electronic structure which should be responsible for many physical properties,especially optical properties.
文摘The inhomogeneity in a congrunet LiTaO3 crystal has been observed by transmission synchrotron topography.Many extraordinary regions exist in congruent LiTaO3 crystal and they often show diffraction intensity different from that of ordinary regions in synchrotron topographs.Differential thermal analysis indiates that the Curie temperature of the extraordinary region is lower than that of ordinary region,and the extraordinary region is really a high defect density region.The diffraction contrast of the extraordinary region in synchrotron topographs is explained qualitatively by a calculation at the selected wavelength.2001 Published by Elsevier Science B.V.
文摘通过冷等静压成型空气气氛下无压烧结把 L i Ta O3压电陶瓷颗粒作为增韧相引入 Al2 O3结构陶瓷 ,结果发现 ,L i Ta O3与 Al2 O3在 130 0℃烧结后能稳定共存 ,L i Ta O3颗粒弥散均匀分布 ;L i Ta O3的加入改善了 Al2 O3陶瓷的烧结性能 ;L i Ta O3颗粒含量适中的 Al2 O3基陶瓷复合材料的力学性能显著提高。
