人工晶体学报
人工晶體學報
인공정체학보
2009年
6期
1309-1312,1319
,共5页
阮永丰%马鹏飞%贾敏%李文润%张宇晖%张守超%王丹丽
阮永豐%馬鵬飛%賈敏%李文潤%張宇暉%張守超%王丹麗
원영봉%마붕비%가민%리문윤%장우휘%장수초%왕단려
SiC%中子辐照%辐照缺陷%钉扎
SiC%中子輻照%輻照缺陷%釘扎
SiC%중자복조%복조결함%정찰
SiC%neutron-irradiation%irradiation damage%pinning
分别对两种不同的6H-SiC晶体进行了总通量为5.74×10~(18) n· cm~(-2)、8.2×10~(18) n· cm~(-2)和1.72×10~(19) n· cm~(-2)的不同剂量的中子辐照,利用X射线衍射等手段观测了中子辐照引起的晶体内部损伤.结果表明:两种样品在不同的中子通量辐照下,消除部分原始缺陷的、纯度较高的样品辐照后的内部损伤明显小于纯度较低、内部原始缺陷较多的样品.样品的辐照损伤不仅取决于中子辐照剂量,还取决于其辐照时的成分和结构.晶体的结构缺陷和杂质,作为一种"钉扎",在辐照过程中作用极大,它们导致了晶体的长程缺陷(如位错)的大幅度增加.
分彆對兩種不同的6H-SiC晶體進行瞭總通量為5.74×10~(18) n· cm~(-2)、8.2×10~(18) n· cm~(-2)和1.72×10~(19) n· cm~(-2)的不同劑量的中子輻照,利用X射線衍射等手段觀測瞭中子輻照引起的晶體內部損傷.結果錶明:兩種樣品在不同的中子通量輻照下,消除部分原始缺陷的、純度較高的樣品輻照後的內部損傷明顯小于純度較低、內部原始缺陷較多的樣品.樣品的輻照損傷不僅取決于中子輻照劑量,還取決于其輻照時的成分和結構.晶體的結構缺陷和雜質,作為一種"釘扎",在輻照過程中作用極大,它們導緻瞭晶體的長程缺陷(如位錯)的大幅度增加.
분별대량충불동적6H-SiC정체진행료총통량위5.74×10~(18) n· cm~(-2)、8.2×10~(18) n· cm~(-2)화1.72×10~(19) n· cm~(-2)적불동제량적중자복조,이용X사선연사등수단관측료중자복조인기적정체내부손상.결과표명:량충양품재불동적중자통량복조하,소제부분원시결함적、순도교고적양품복조후적내부손상명현소우순도교저、내부원시결함교다적양품.양품적복조손상불부취결우중자복조제량,환취결우기복조시적성분화결구.정체적결구결함화잡질,작위일충"정찰",재복조과정중작용겁대,타문도치료정체적장정결함(여위착)적대폭도증가.
Two different 6H-SiC single crystals were neutron-irradiated with different dose of 5.74×10~(18) n·cm~(-2),8.2×10~(18) n·cm~(-2) and 1.72×10~(19) n·cm~(-2) respectively, the damages caused by neutron irradiation were studied by X-ray diffraction. It is found that the damages in the samples with higher purity or in the samples annealed before irradiation are less than that in the samples which are with lower purity or un-annealed. The experimental results indicate that the creations of irradiation damages are not only decided on the irradiation fluences, but also are decided on the structure and the composition of the samples. The inherent defects and the impurity atom play an important role in the irradiation process as the "pinning", which result in the increasing of the long-range defects such as dislocations.