报导了硬脂酸凝胶法制备的 Ba Ti O3纳米晶及烧制的陶瓷材料的特殊物性。用 X射线衍射、高分辨透射电镜、X荧光光谱、表面光电子能谱、介电谱、热释电谱研究了纳米微粉及陶瓷材料的晶体结构、晶粒尺寸、体相和表面相组份及铁电性能。结...报导了硬脂酸凝胶法制备的 Ba Ti O3纳米晶及烧制的陶瓷材料的特殊物性。用 X射线衍射、高分辨透射电镜、X荧光光谱、表面光电子能谱、介电谱、热释电谱研究了纳米微粉及陶瓷材料的晶体结构、晶粒尺寸、体相和表面相组份及铁电性能。结果表明 ,所有样品在室温下均为立方结构 ,没有铁电性 ,陶瓷样品在低温下 ( <2 0 0 K)具有铁电性。并发现纳米晶 Ba Ti O3及陶瓷具有湿敏特性。展开更多
Cluster model with DV-Xαmethod is used to study the structural and electronic properties of the p-type doping of ZnSe.It is found that there is Jahn-Teller distortion for P doping and almost no Jahn-Teller distortion...Cluster model with DV-Xαmethod is used to study the structural and electronic properties of the p-type doping of ZnSe.It is found that there is Jahn-Teller distortion for P doping and almost no Jahn-Teller distortion for N doping,and that the impurity levels with respect to the maximum of valence band are 118 and 96meV for N and P doping,respectively.The reasons why N can serve as a better dopant than P for p-type ZnSe are discussed.展开更多
文摘报导了硬脂酸凝胶法制备的 Ba Ti O3纳米晶及烧制的陶瓷材料的特殊物性。用 X射线衍射、高分辨透射电镜、X荧光光谱、表面光电子能谱、介电谱、热释电谱研究了纳米微粉及陶瓷材料的晶体结构、晶粒尺寸、体相和表面相组份及铁电性能。结果表明 ,所有样品在室温下均为立方结构 ,没有铁电性 ,陶瓷样品在低温下 ( <2 0 0 K)具有铁电性。并发现纳米晶 Ba Ti O3及陶瓷具有湿敏特性。
基金Supported by the'863'High Technology Program of China.
文摘Cluster model with DV-Xαmethod is used to study the structural and electronic properties of the p-type doping of ZnSe.It is found that there is Jahn-Teller distortion for P doping and almost no Jahn-Teller distortion for N doping,and that the impurity levels with respect to the maximum of valence band are 118 and 96meV for N and P doping,respectively.The reasons why N can serve as a better dopant than P for p-type ZnSe are discussed.
