Structure and polarity of the Si C single crystal have been analyzed with the four- circle X- ray diffraction method by a double- crystal diffractom eter.The hexagonal{ 10 15 } pole figure shows that this Si C sam pl...Structure and polarity of the Si C single crystal have been analyzed with the four- circle X- ray diffraction method by a double- crystal diffractom eter.The hexagonal{ 10 15 } pole figure shows that this Si C sam ple has a6 H modification.The difference between the integrated intensities m easured byω scan in the triple- axis diffraction set- up finds some convincing evidence that the surface is either a Si- terminated face or C- terminated face.The experi- mental ratios of| F( 0 0 0 L) | 2 / | F( 0 0 0 L) | 2 are in good agreem entwith the calculated ones after the dispersion cor- rections to the atomic scattering factors( L=6 ,12 and18,respectively) .Thus,this m easurem ent technique is con- venient for the application of the materials with remarkable surface polarity.展开更多
一、引言
X射线单晶体衍射仪的英文名称是X-ray single cry stal diffractomet er,简写为XRD.
本仪器分析的对象是一粒单晶体,如一粒砂糖或一粒盐.在一粒单晶体中原子或原子团均是周期排列的.将X射线(如C u的Kα辐射)射到一粒单晶体上...一、引言
X射线单晶体衍射仪的英文名称是X-ray single cry stal diffractomet er,简写为XRD.
本仪器分析的对象是一粒单晶体,如一粒砂糖或一粒盐.在一粒单晶体中原子或原子团均是周期排列的.将X射线(如C u的Kα辐射)射到一粒单晶体上会发生衍射,由对衍射线的分析可以解析出原子在晶体中的排列规律,也即解出晶体的结构[1].物质或由其构成的材料的性能是与晶体的结构密切相关的,如金刚石和石墨都是由纯的碳构成的,由于它们的晶体结构不同就有着截然不同的性质.展开更多
文摘Structure and polarity of the Si C single crystal have been analyzed with the four- circle X- ray diffraction method by a double- crystal diffractom eter.The hexagonal{ 10 15 } pole figure shows that this Si C sam ple has a6 H modification.The difference between the integrated intensities m easured byω scan in the triple- axis diffraction set- up finds some convincing evidence that the surface is either a Si- terminated face or C- terminated face.The experi- mental ratios of| F( 0 0 0 L) | 2 / | F( 0 0 0 L) | 2 are in good agreem entwith the calculated ones after the dispersion cor- rections to the atomic scattering factors( L=6 ,12 and18,respectively) .Thus,this m easurem ent technique is con- venient for the application of the materials with remarkable surface polarity.
文摘一、引言
X射线单晶体衍射仪的英文名称是X-ray single cry stal diffractomet er,简写为XRD.
本仪器分析的对象是一粒单晶体,如一粒砂糖或一粒盐.在一粒单晶体中原子或原子团均是周期排列的.将X射线(如C u的Kα辐射)射到一粒单晶体上会发生衍射,由对衍射线的分析可以解析出原子在晶体中的排列规律,也即解出晶体的结构[1].物质或由其构成的材料的性能是与晶体的结构密切相关的,如金刚石和石墨都是由纯的碳构成的,由于它们的晶体结构不同就有着截然不同的性质.
