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Terahertz transmission properties of Cr ion implantation glass
作者: 苏红, 周航, 王世兴, 陈琼州, 梁华伟, 阮双琛 主题: 年份: 2010
摘要: <正>cr ion implantations in glass with the different doses of d=1.493×10~(17) and 4.976×10~(17) ion/cm~2 are obtained by metal vapor vacuum arc(mevva).the effects of the different cr ion implanted doses on terahertz(thz) transmission property are analyzed from thz time-domain spectroscopy.the results show that the more the cr ion implanted dose in the micro-area implantation glasses,the larger the thz transmission except the larger absorption at 0.24 thz.this is an effect attributed to the coupling of plasmas on both the implantation and the implantation affected zones of the cr ion implantation glass.
Loss properties of all-solid photonic band gap fibers with an array of rings
作者: 耿优福, 李学金, 谭晓玲, 姚建铨 主题: 年份: 2010
摘要: the confinement loss and bend loss properties of all-solid photonic band gap fibers with an array of rings doped with highindex material are investigated.the calculated results show that for a specific structure,the confinement loss and the critical bend radius are reduced simultaneously in some band gaps by increasing the inner diameter of ring,which provides a useful guide and a theoretical basis for designing large mode area fibers with low loss.
Effect of melt superheating treatment on crystallization behavior and magnetic properties of melt-spun Fe-rich Nd-Fe-B ribbons
作者: 盛洪超, 曾燮榕, 胡强, 邓飞 主题: microstructure, nanocomposite magnets, melt superheating treatment, rare earths 年份: 2010
摘要: melt-spun nd7fe90b3 ribbons were prepared under different melt treatment conditions,i.e.,the melt temperature was varied prior to ejection onto the quenching wheel.the microstructure characteristics,crystallization behavior,and subsequent magnetic properties of α-fe/nd2fe14b-based exchange-spring magnets were investigated using x-ray diffraction,differential scanning calorimeter,transmission electron microscopy,and vibrating sample magnetometer.it was shown that melt spinning at different quenching temperatures caused the as-quenched ribbons to have distinctive crystallization behavior.under high quenching temperature,precipitation of tbcu7 type phase was inhibited during crystallization,resulting in remarkable reduction of grain size.this led to strengthening of exchange coupling effect between the magnetically hard and soft phase and improvement of magnetic properties of annealed ribbons.
Effect of super heat treatment on crystallization behavior and magnetic properties of Nd_(4.5)Fe_(77)B_(18.5) nanocomposites
作者: 盛洪超, 曾燮榕, 邹继兆, 谢盛辉 主题: nanocomposite magnets, amorphous alloys, superheat treatment, rare earths 年份: 2010
摘要: melt-spun nd4.5fe77b18.5 ribbons were prepared under various superheat temperatures.the microstructure characteristics,crystallization behavior,and subsequent magnetic properties of fe3b/nd2fe14b nanocomposite magnets were investigated using x-ray diffraction,differential thermal analysis,and vibrating sample magnetometry.it was shown that melt spinning at different quenching temperatures caused the as-quenched ribbons to have distinctive crystallization behavior.depending on superheat temperature,phase transformation of the ribbons during annealing may take place in one of the following sequences:(1) amorphous phase(am)→am'+fe3b→fe3b+ nd2fe23b3→ fe3b+nd2fe14b,or(2) amorphous phase(am)→am'+fe3b→fe3b+nd2fe14b.for the latter,the ribbon after optimal annealing exhibited single-phase magnetic behavior.in the first case,magnetic properties of the optimally heat treated ribbons deteriorated and an apparent kink could be seen along the demagnetization curves near the zero field.
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