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The microstructure, electrical properties and density of ZnO-based varistor ceramics with different Er2O3 content prepared by high-energy ball milling (HEBM) and sintered at 800℃ were investigated. With increasing Er2O3 content, the ZnO grain size decreases due to the Er-rich phases inhibiting grain growth ; and nonlinear coefficient ( α ) decreases because of the decrease of barrier height (φB) The breakdown voltage (Eb) and density increase, whereas leakage current (IL) decreases with increasing Er2O3 content. The barrier height (φB), donor concentration (Nd), density of interface states (Ns) decrease and barrier width (ω) increases with increasing Er2O3 content due to acceptor effect of Er2O3 in varistor ceramics. 相似文献
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采用磁控溅射法,选用LaNi O3作为缓冲层,在硅基片上制备出了0.74Pb(Mg1/3Nb2/3)O3-0.26PbTiO3弛豫铁电薄膜.研究了沉积温度对薄膜的微结构和光学性能的影响.其中,沉积温度为500oC时制备的薄膜,不仅具有纯的钙钛矿结构,高度(110)择优取向、致密、无裂纹的形貌、而且具有最大的剩余极化,大小为17.2μC/cm2.使用柯西模型进行拟合反射谱,分析得到薄膜的折射率和消光系数.在波长为633 nm时,500oC沉积的薄膜的折射率大小为2.41.另外,薄膜的光学带隙在2.97~3.22 eV范围内.并初步讨论了这些薄膜的光学性能的差异. 相似文献
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Zinc oxide (ZnO) varistors exhibit highly nonlin-ear voltage-current (V-I) properties and it is ex-pressed bythe relationI=KVα,whereKis a constantandαis a nonlinear coefficient .They are extensivelyused as surge arresters in electric power lines ,such a… 相似文献
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采用PECVD法制备了α-SiOxNy薄膜,观察到两组分立能级的强荧光发射,一组位于紫外光波段,由三个可分辨的发射峰组成,波长分别为330、340和345nm;另一组位于红光波段,由两个发射峰组成,波长分别为735nm和745nm.发射峰依赖于薄膜中氧和氮的同时存在,其强度首先随薄膜中其含量的增加而增强,达到饱和值后,随着其含量的进一步增加而下降.这表明发射峰可能起源于O-Si-N结合而形成的发光中心. 相似文献