ISSN:
1572-9540
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The technique of perturbed angular correlation of gamma rays (PAC) was applied to study the martensitic phase transition of a shape-memory-effect alloy Ni49.9Ti50.1 doped with111In/Cd probe atoms. Spectra measured above and below the martensite starting temperature,M s ≈ 340 K, exhibit quadrupole interactions of probes at cubic and noncubic lattice sites, consistent with the respective crystal structures. Unlike spectra measured belowM s those measured above exhibit a large frequency distribution attributed to lattice displacement waves observed in diffraction studies. Analysis tentatively suggests that the waves are dynamic and not static. BelowM s, at 290 K, a static quadrupole interaction was observed with coupling frequency ω1=34 Mrad/s and asymmetry parameter η=0.18, increasing to ω1=40.5 Mrad/s and η=0.34 at 77 K.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00567453
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