纳米纤锌矿氮化硼的同步辐射真空紫外反射光谱与光学性质  

REFLECTANCE SPECTRUM AND OPTICAL PROPERTIESOF NANO-wBN IN THE VUV REGION OFSYNCHROTRON RADIATlON

作　　者：苏夷希 巨新[1] 魏坤[1] 池元斌[1] 韩正甫[1] 石军岩[1] 邓杰[1] 施朝淑[1] 

机构地区：[1]中国科学技术大学物理系,中国科学技术大学近代物理系,吉林大学超硬材料国家实验室,中国科学技术大学合肥国家同步辐射实验室

出　　处：《物理学报》1994年第10期1718-1725,共8页Acta Physica Sinica

基　　金：国家自然科学基金

摘　　要：对冲击波法合成的纳米纤锌矿氮化硼（ｗＢＮ）进行了同步辐射真空紫外区的反射光谱测量，得到波长范围１００一２４０ｎｍ区间的反射光谱．利用Ｋｒａｍｅｒｓ－Ｋｒｏｎｉｇ关系计算获得了它的光学常数和介电函数谱，并导出了光电导谱．获得了纳米ｗＢＮ的光学禁带宽度实验值，为８．７±０．５ｅＶ．将以上结果和最新的理论计算进行了比较．观察到了经不同退火温度处理的纳米ｗＢＮ样品结构及尺寸变化对反射光谱和光学性质的影响．The reflectance spectrum of different wBN was measured. The sample wereprepared by shock-wave method and heat-treated at 100℃ and 500℃. The measure-ment was perlormed in the wavelength range of 100-240nm at the time-resolvedspectroscopy station of National Synchrotron Radiation Laboratory in Hefei. Theoptical constants of wBN have been determined in the VUV region by applying theKramers-Kronig relation to normal incidence reflectance data. It was found that theaverage value of optical band gap determined from these constants is 8.7±0.5eV.The dielectric constants, optical conductivity of wBN were also obtained. The effetof the charges of particle size and structure of the nanometer-sized wBN on the op-tical reflectance spectrum were further studied.

关 键 词：氮化硼 冲击波合成法 光学性质 

分 类 号：O482.3[理学—固体物理]