【摘要】 测量了采用Melt-Spinning方法制备的非晶态合金Zr_100-xSi_x（8.8≤x≤15.3）的超导临界温度与Si浓度的关系.发现:在上述组分范围内,T_c以0.18K/（at.％）的速率随着Si含量增加而线性地下降.经外推到x=0,得非晶态纯Zr的T_c应为5.15K,与Onn et:al根据Fe-Zr合金的低温比热测量结果作理论外推所得的值十分一致.研究了非晶态合金Zr_87.7Si_12.3分别在310、370、415和445℃下作等温热处理对T_c的影响.结果表明,其结构弛豫行为与金属-金属型Zr基合金的大为不同.T_c的变化速率大且不遵从Int规律;随着热处理的进行,T_c较快地就趋向于饱和.伴随着结晶化的开始,T_c则以一大得多的速率下降.结合DSC等测量结果,对Zr-Si合金的结构弛豫和结晶化行为进行了讨论.更多还原

【Abstract】 Zr-metalloid-type amorphous alloys Zr_100-x Si_x(8.8 x 15.3, were prepared by amelt-spinning technique. The dependence of the superconducting critical temperature,T_c’ on the alloy composition shows that T_c decreases linearly with increasing Si contentat a rate of 0.18 K/at.%. The extrapolated T_c of the pure amorphous Zr amounts to5.15 K. This value is in good agreement with the result deduced by Onn et al., basedon low-temperature specific-heat measurements of amorphous Zr-Fe alloys. Isothermal anneals of Zr_87.7Si_12.3 were conducted at 310, 370, 415 and 445℃. TheT_c. measurements of these samples show that the structural relaxation behavior ismuch different from that of the Zr-TM-type amorphous alloys Zr-Co and Zr-Ni. T_c ofZr_87.7Si_12.3 changes with annealing time at a larger rate, tends to saturate after seve-ral hours and does not obey the In t rule. Crystallization leads to a drastic decrease ofT_c. These results, combined with DCS measurements, are used for a discussion of thestructural relaxation and crystallization.更多还原