Anomalous Phonon Thermal Resistivity in Superconducting Ti_<55>Nb_<45> Alloys(Physics)

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The thermal conductivity of cold-worked and heat-treated Ti_<55>Nb_<45> alloys has been measured in the temperature range between 0.6 and 1.5 K. Anomalously strong scattering of phonons for every sample and the remarkable enhancement in the thermal resistivity caused by the annealing at 500℃ on cold-worked alloys have been found. These behaviors indicate the existence of an anomalous phonon scattering mechanism besides dislocation scattering in Ti_<55>Nb_<45> alloys . Electron diffraction patterns show the circular diffuse streaks characteristic of the precursory lattice distortion for the ω atomic configuration. Two kinds of models which correlate the anomalies in the phonon scattering with the lattice instability of the β phase of Ti-Nb matrix are described.
東北大学の論文