Torsional oscillator and synchrotron x-ray experiments on solid 4He in   aerogel
  X-ray diffraction experiments show that solid 4He grown in aerogel is highly polycrystalline, with a hcp crystal structure (as in bulk) and a crystallite size of approximately 100 nm. In contrast to the expectation that the highly disordered solid will have a large supersolid fraction, torsional oscillator measurements show a behavior that is strikingly similar to high purity crystals grown from the superfluid phase. The low temperature supersolid fraction is only ~3x10-4 and the onset temperature is ~ 100 mK. 
N. Mulders, J.T. West, M.H.W. Chan, C.N. Kodituwakku, C.A. Burns and   L.B. Lurio