Cr对Fe-Zr基非晶合金电阻率及压力效应的影响

INFLUENCE OF Cr-CONTENT ON BOTH RESISTIVITY AND ITS PRESSURE EFFECT IN AMORPHOUS Fe-Zr BASE ALLOYS

在0.0001～2.5GPa范围不同静水压下,用四探针法详细测量了七种非晶态Fe_((?)0-(?))Cr_xZr_(10)合金(x=2、4、7、10、13、16、20)的电阻率。结果表明:(1)常压室温电阻率ρ0与FeZr基非晶合金中Cr含量成N形曲线关系;(2)当静水压增加时,七种非晶合金的约化电阻率(ρ/ρ0)都单调下降,x越大则电阻率下降的幅度越小,(3)非晶Fe_(90-x)-Cr_xZr_(10)合金电阻率的压力系数对x的变化相当敏感;(4)为方便查值,给出了六种典型静水压下ρ/ρ0与x的曲线关系。最后,讨论了四种物理模型的选用以及相干交换散射在高压下的行为。

The resistivity of amorphous Fe90-zCrzZr10(x=2,4,7,10,13,16,20) alloys was measured in detail by a 4-probe dc technique under different hydrostatic pressure from 0. 0001 GPa to 2. 5GPa. It is observed that: (1) The resistivity p0 at room temperature and atmosphere pressure varies in a manner similar to the alphabet N as the content of Cr in amorphous Fe-Zr base alloys increases ; (2) Relative resistivity ρ/ρ0 of amorphous Fe90-z CrzZr10 alloy drops monotonously when the hydrostatic pressure increases,the more the content of Cr,the smaller the decrease of resistivity ; (3) Pressure coefficient of amorphous Fe90-zCrz Zr10 alloys is quite sensitive to the variation in x; (4) Relation between ρ/ρ0 and 2 under 6 typical pressure was given. Finally we discussed the selection of four physical models and the behavior of coherent exchange scattering under high hydrostatic pressure.