采用溶胶凝胶法制备x Mn-Ba0.2Sr0.8Zr0.18Ti0.82O3(BSZT)(x=0mol%、1mol%、2mol%、3mol%)的陶瓷粉末,以传统工艺制备Mn离子掺杂的BSZT陶瓷。研究Mn离子掺杂浓度对BSZT陶瓷烧结特性、物相结构、介电性能、击穿场强以及储能密度的影响。...采用溶胶凝胶法制备x Mn-Ba0.2Sr0.8Zr0.18Ti0.82O3(BSZT)(x=0mol%、1mol%、2mol%、3mol%)的陶瓷粉末,以传统工艺制备Mn离子掺杂的BSZT陶瓷。研究Mn离子掺杂浓度对BSZT陶瓷烧结特性、物相结构、介电性能、击穿场强以及储能密度的影响。结果表明,Mn离子掺杂降低了BSZT陶瓷的烧结温度,同时降低其介电常数以及介电损耗,提高了击穿场强和储能密度。在1400℃下烧结的2mol%Mn离子掺杂BSZT陶瓷较未掺杂BSZT陶瓷的烧结温度降低了100℃,相对密度为96.3%;1 k Hz处介电常数约为497、介电损耗为0.36%;最大击穿场强为12.595 k V/mm;最大储能密度为0.374 J/cm3。展开更多
通过静电纺丝制备了定向排列的0.5(Ba_(0.7)Ca_(0.3))TiO_3-0.5Ba(Zr_(0.2)Ti_(0.8))O_3(BCZT)纳米线,并利用纳米线制备了纳米发电机。研究了定向排列纳米线对纳米发电机输出性能的影响。X射线粉末衍射谱和拉曼光谱显示:制备的纳米线具...通过静电纺丝制备了定向排列的0.5(Ba_(0.7)Ca_(0.3))TiO_3-0.5Ba(Zr_(0.2)Ti_(0.8))O_3(BCZT)纳米线,并利用纳米线制备了纳米发电机。研究了定向排列纳米线对纳米发电机输出性能的影响。X射线粉末衍射谱和拉曼光谱显示:制备的纳米线具有良好的四方相钙钛矿结构。扫描电子显微镜照片显示,利用平行电极收集器可以实现大部分纳米线的定向排列。测试了纳米发电机的压电性能,结果显示:基于定向排列纳米线的纳米发电机平均输出电流为89.69 n A,而基于无序排列纳米线的纳米发电机平均输出电流为52.36 n A。相比而言,发电机的电流输出性能提升了71.3%。利用发电机制备的自供电式可穿戴肢体动作传感器响应非常好,能在不需要外部电源的情况下很好地区分不同肢体部位的弯曲动作。展开更多
Ba0.5Sr0.5Co0.8Fe0.2O3-delta and Ba0.5Sr0.5Co0.8Ti0.2O3-delta oxides were synthesized by a combined EDTA-citrate complexing method. The catalytic behavior of these two oxides with the perovskite structure was studied ...Ba0.5Sr0.5Co0.8Fe0.2O3-delta and Ba0.5Sr0.5Co0.8Ti0.2O3-delta oxides were synthesized by a combined EDTA-citrate complexing method. The catalytic behavior of these two oxides with the perovskite structure was studied during the reaction of methane oxidation. The pre-treatment with methane has different effect on the catalytic activities of both the oxides. The methane pre-treatment has not resulted in the change of the catalytic activity of BSCFO owing to its excellent reversibility of the perovskite structure resulting from the excellent synergistic interaction between Co and Fe in the oxide. However, the substitution with Ti on Fe-site in the lattice makes the methane pre-treatment have an obvious influence on the activity of the formed BSCTO oxide.展开更多
文摘采用溶胶凝胶法制备x Mn-Ba0.2Sr0.8Zr0.18Ti0.82O3(BSZT)(x=0mol%、1mol%、2mol%、3mol%)的陶瓷粉末,以传统工艺制备Mn离子掺杂的BSZT陶瓷。研究Mn离子掺杂浓度对BSZT陶瓷烧结特性、物相结构、介电性能、击穿场强以及储能密度的影响。结果表明,Mn离子掺杂降低了BSZT陶瓷的烧结温度,同时降低其介电常数以及介电损耗,提高了击穿场强和储能密度。在1400℃下烧结的2mol%Mn离子掺杂BSZT陶瓷较未掺杂BSZT陶瓷的烧结温度降低了100℃,相对密度为96.3%;1 k Hz处介电常数约为497、介电损耗为0.36%;最大击穿场强为12.595 k V/mm;最大储能密度为0.374 J/cm3。
文摘通过静电纺丝制备了定向排列的0.5(Ba_(0.7)Ca_(0.3))TiO_3-0.5Ba(Zr_(0.2)Ti_(0.8))O_3(BCZT)纳米线,并利用纳米线制备了纳米发电机。研究了定向排列纳米线对纳米发电机输出性能的影响。X射线粉末衍射谱和拉曼光谱显示:制备的纳米线具有良好的四方相钙钛矿结构。扫描电子显微镜照片显示,利用平行电极收集器可以实现大部分纳米线的定向排列。测试了纳米发电机的压电性能,结果显示:基于定向排列纳米线的纳米发电机平均输出电流为89.69 n A,而基于无序排列纳米线的纳米发电机平均输出电流为52.36 n A。相比而言,发电机的电流输出性能提升了71.3%。利用发电机制备的自供电式可穿戴肢体动作传感器响应非常好,能在不需要外部电源的情况下很好地区分不同肢体部位的弯曲动作。
文摘Ba0.5Sr0.5Co0.8Fe0.2O3-delta and Ba0.5Sr0.5Co0.8Ti0.2O3-delta oxides were synthesized by a combined EDTA-citrate complexing method. The catalytic behavior of these two oxides with the perovskite structure was studied during the reaction of methane oxidation. The pre-treatment with methane has different effect on the catalytic activities of both the oxides. The methane pre-treatment has not resulted in the change of the catalytic activity of BSCFO owing to its excellent reversibility of the perovskite structure resulting from the excellent synergistic interaction between Co and Fe in the oxide. However, the substitution with Ti on Fe-site in the lattice makes the methane pre-treatment have an obvious influence on the activity of the formed BSCTO oxide.
