Abstract

Measurements of ultrasonic attenuation and velocity in dilute Nb-O-H alloys were made as a function of temperature, frequency, polarization, annealing temperature, isotope, and defect concentration. In addition to the stable 2.4 K relaxation peak found earlier by Poker, et. al., an additional peak at 6.3 K at 10 MHz was found when the specimen was rapidly cooled to He temperature. The peak correlated with the resistivity recovery found by Hanada for quenched specimens and corresponds to a complex with tetragonal symmetry.

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