Negative temperature coefficient of electrical resistivity in B2-type Ti-Ni alloys

被引：31

作者：

Kakeshita, T ^{[1
]}

Fukuda, T

Tetsukawa, H

Saburi, T

Kindo, K

Takeuchi, T

Honda, M

Endo, S

Taniguchi, T

Miyako, Y

机构：

[1] Osaka Univ, Fac Engn, Dept Mat Sci & Engn, Suita, Osaka 565, Japan

[2] Osaka Univ, Res Ctr Mat Sci Extreme Condit, Toyonaka, Osaka 560, Japan

[3] Osaka Univ, Low Temp Ctr, Toyonaka, Osaka 560, Japan

[4] Naruto Univ Educ, Fac Sci, Dept Phys, Tokushima 772, Japan

[5] Osaka Univ, Fac Sci, Dept Phys, Toyonaka, Osaka 560, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 1998年 / 37卷 / 5A期

关键词：

negative temperature coefficient; electrical resistivity; titanium-nickel alloy; phase transition; magnetic susceptibility; specific heat; magnetization electron-phonon interaction;

D O I：

10.1143/JJAP.37.2535

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A negative temperature coefficient of electrical resistivity (TCR) has been observed in Ti50-XNi50+X (at.%; X = 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5) in the temperature range between 20 and 350 K. The resistivity vs temperature curve has no hysteresis and the relative resistivity at 20 K (rho(20) K/rho(350) K) decreases with increasing Ni content. X-ray diffraction ana magnetic susceptibility measurements show that a negative TCR is not caused by structural phase transition nor by magnetic transition. The Debye temperature of Ti48Ni52, Obtained from the analysis of specific heat measurements, is quite low (217 K) and its spin relaxation process has a time duration between 400 mu s and 20 ms, suggesting that some lattice instability exists. Based on these results, the origin of a negative TCR is discussed.

引用

页码：2535 / 2539

页数：5

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