Nb衬底MgB_2超导膜的韧性研究  

MgB_2 FILMS ON Nb SUBSTRATE AND ITS BENDING TEST

作　　者：姚丹[1] 谭腾[2] 冯思敏[2] 黄煦[2] 孙玄[2] 冯庆荣[2] 

机构地区：[1]空军航空大学,基础训练基地基础部物理教研室,吉林长春130022 [2]北京大学物理学院,人工微结构与介观物理国家重点实验室,北京10087

出　　处：《低温物理学报》2009年第3期179-183,共5页Low Temperature Physical Letters

基　　金：国家自然科学基金委(项目编号:50572001);国家"973"项目(编号:2006CD601004);国家基础科学人才培养基金(NFFTBS)(项目编号:J0630311)资助的课题~~

摘　　要：用混合物理化学气相沉积法(hybrid physics-chemical vapor deposition简称为HPCVD)在Nb衬底上生原位制备了平均厚度是1.5μm的MgB2多晶膜样品,其起始超导转变温度Tc(onset)=39.37K,转变宽度ΔTc=0.45K.样品由大量六边型片状晶粒组成.对样品进行了韧性测试,可以发现膜在弯曲120°后,虽然弯曲面处出现了裂纹,但膜仍很牢固的附着在衬底上,其超导电性仍可保持.Poly-crystalline MgB2 films have been grown on niobium substrate by using the hybrid physical-chemical vapor deposition （HPCVD） with a thickness about 1.5μm, which have good transport performance with Tc = 39.37K, ATc = 0.45K. Films are composed of regular plate-shape hexagonal MgB2 crystallites and have lattice constants approaching the bulk values. For this sample, the bending test has been also performed, and it can be found that the film adhered on the substrate firmly and could keep its superconductivity after bending to 120°.

关 键 词：混合物理化学气相沉积法 Nb衬底 MgB2膜 韧性 

分 类 号：O484[理学—固体物理]