Microwave Kinetic Inductance Detectors (MKIDs) provide highly multiplexed
arrays of detectors that can be configured to operate from the sub-millimeter
to the X-ray regime. We have examined two tungsten silicide alloys (W5Si3 and
WSi2), which are dense alloys that provide a critical temperature tunable with
composition, large kinetic inductance fraction, and high normal-state
resistivity. We have fabricated superconducting resonators and provide
measurement data on critical temperature, surface resistance, quality factor,
noise, and quasiparticles lifetime. Tungsten silicide appears to be promising
for microwave kinetic inductance detectors