摘要
报道ThCr2Si2 型结构的四元金属间化合物Y2Ni2B2Cx 的形成与超导电性.当碳配比含量x = 0-9 —1-2 时,电弧熔炼的合金结晶为较好的YNi2B2C 单相.当x < 0-8 或x > 1-2 时,合金中虽仍以YNi2B2C 为主相,但杂相明显增加.超导转变温度Tc 随碳含量增加明显分为两个台阶.x ≤0-8 时,Tc 约为12-5 K;x ≥0-9 时,Tc 约为15 K.
In this paper,we report the formation and superconductivity of quaternary intermetallic system YNi\-2B\-2C\- x with ThCr\-2Si\-2\|type structure.Samples prepared by arc\|melting crystallize in single phase of the composition of YNi\-2B\-2C\- x when x =0.9—1.2 while the secondary unknown phases increase obviously when x <0.8 or x >1.2.Superconducting\|transition temperature T c determined by the temperature dependence of magnetization displays two steps with increasing carbon concentration: T c≈12.5?K for x ≤0.8, T c≈15?K for x ≥0.9.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第S1期56-61,共6页
Acta Physica Sinica