Abstract
The amplitude-independent mechanical quality factor (reciprocal internal friction or Q) of 95%-density (pressed and sintered) polycrystalline molybdenum was measured in the temperature range 50 mK–300 K. Data were obtained from a torsional mode at about 1 kHz and a flexural mode at about 10 kHz of a mechanical resonator configured to minimize extraneous acoustic loss effects. Maximum Q values achieved were 1.0×10 7 at 4 K and 1.6×10 7 at 50 mK. High-resolution frequency measurements gave the temperature dependence of the dynamic shear modulus. The strong effects of various heat treatments on the quality factor are demonstrated. The origin of the acoustic absorption peak observed at about 1 K is discussed. Cryogenic gravity-wave antenna design parameters are calculated for a number of high- Q materials including the 95%-density Mo. The 95%-density Mo is shown to be a suitable choice of resonator material for the local array high frequency cryogenic gravity-wave detector.
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