The effect of La^3 ＋ , Sr^2＋ on the microstructure and microwave properties of CaO-MgO-Nb2O5-TiO2 system ceramics was investigated. The result shows that a single complex perovskite structure formed within investiga...The effect of La^3 ＋ , Sr^2＋ on the microstructure and microwave properties of CaO-MgO-Nb2O5-TiO2 system ceramics was investigated. The result shows that a single complex perovskite structure formed within investigated composition range in La^3＋ , Sr2-doped CaO-MgO-Nb2O5-TiO2 system ceramics. With increasing of La^3＋ , Sr^2＋ content, the structure of La^3＋ , Sr2-doped CaO-MgO-Nb2O5-TiO2 system ceramic respectively maintain orthorhombic type.展开更多
Sliding friction and wear behavior of two different grain-size aluminas （average grain size = 0.6 and 2 μm） was studied in physiological saline environment. Relationship between time and wear loss was observed. The...Sliding friction and wear behavior of two different grain-size aluminas （average grain size = 0.6 and 2 μm） was studied in physiological saline environment. Relationship between time and wear loss was observed. The wear loss volume increased with increased sliding time and fine-grained alumina exhibits a lower value. In the initial wear-in period, grains pull-out caused by grain-boundary microcracking is the dominant wear mechanism of submicron grained alumina. In the case of alumina of large grain size, intergranular and transgranular fracture is the basic wear mechanism. As the sliding time increases, compaction of wear debris on sliding surface of fine and coarsen alumina determines the wear characteristics.展开更多
近年来,随着柔性电子的快速发展,制造柔性、微型、大面积和低成本的储能器件得到了极大的关注。以六水硝酸镍/钴为原料、硫脲为硫化剂、引入热解g-CN,通过一步溶剂热制备NiCo_(2)S_(4)/g-CN纳米复合材料。采用掩膜版将调配的NiCo_(2)S_(...近年来,随着柔性电子的快速发展,制造柔性、微型、大面积和低成本的储能器件得到了极大的关注。以六水硝酸镍/钴为原料、硫脲为硫化剂、引入热解g-CN,通过一步溶剂热制备NiCo_(2)S_(4)/g-CN纳米复合材料。采用掩膜版将调配的NiCo_(2)S_(4)/g-CN油墨印刷在柔性聚对苯二甲酸乙二醇酯基底形成叉指结构电极,继而涂覆凝胶电解质组装成柔性叉指型超级电容器。结构和电化学性能研究表明:NiCo_(2)S_(4)纳米晶分布生长在g-CN纳米片层表面,引入的g-CN起到增强NiCo_(2)S_(4)充放电过程中的电荷传输及容纳其体积膨胀的作用,复合材料电极在10 m A/cm^(2)的电流密度下面积比电容为9.1 F/cm^(2)。组装的叉指电容器可在–0.2~0.6 V的电压下工作,并且在高至500 m V/s的扫描速率下保持稳定,表明器件良好的倍率性能。在20 m V/s的扫描速率下,器件的面积比电容可达5.7 m F/cm^(2),当功率密度为17.5 m W/cm~3时,器件的能量密度为0.56 m W·h/cm^(3)。展开更多
文摘The effect of La^3 ＋ , Sr^2＋ on the microstructure and microwave properties of CaO-MgO-Nb2O5-TiO2 system ceramics was investigated. The result shows that a single complex perovskite structure formed within investigated composition range in La^3＋ , Sr2-doped CaO-MgO-Nb2O5-TiO2 system ceramics. With increasing of La^3＋ , Sr^2＋ content, the structure of La^3＋ , Sr2-doped CaO-MgO-Nb2O5-TiO2 system ceramic respectively maintain orthorhombic type.
基金Funded by the National Natural Science Foundation of China(Nos.51102289 and 50975302)the Key Laboratory of Inorganic function material and device,Chinese Academy of Sciences(KLIFMD-2011-04)
文摘Sliding friction and wear behavior of two different grain-size aluminas （average grain size = 0.6 and 2 μm） was studied in physiological saline environment. Relationship between time and wear loss was observed. The wear loss volume increased with increased sliding time and fine-grained alumina exhibits a lower value. In the initial wear-in period, grains pull-out caused by grain-boundary microcracking is the dominant wear mechanism of submicron grained alumina. In the case of alumina of large grain size, intergranular and transgranular fracture is the basic wear mechanism. As the sliding time increases, compaction of wear debris on sliding surface of fine and coarsen alumina determines the wear characteristics.
文摘近年来,随着柔性电子的快速发展,制造柔性、微型、大面积和低成本的储能器件得到了极大的关注。以六水硝酸镍/钴为原料、硫脲为硫化剂、引入热解g-CN,通过一步溶剂热制备NiCo_(2)S_(4)/g-CN纳米复合材料。采用掩膜版将调配的NiCo_(2)S_(4)/g-CN油墨印刷在柔性聚对苯二甲酸乙二醇酯基底形成叉指结构电极,继而涂覆凝胶电解质组装成柔性叉指型超级电容器。结构和电化学性能研究表明:NiCo_(2)S_(4)纳米晶分布生长在g-CN纳米片层表面,引入的g-CN起到增强NiCo_(2)S_(4)充放电过程中的电荷传输及容纳其体积膨胀的作用,复合材料电极在10 m A/cm^(2)的电流密度下面积比电容为9.1 F/cm^(2)。组装的叉指电容器可在–0.2~0.6 V的电压下工作,并且在高至500 m V/s的扫描速率下保持稳定,表明器件良好的倍率性能。在20 m V/s的扫描速率下,器件的面积比电容可达5.7 m F/cm^(2),当功率密度为17.5 m W/cm~3时,器件的能量密度为0.56 m W·h/cm^(3)。
