  Highly dense MgB2 policrystalline bulk materials, obtained by reactive liquid
infiltration, have been characterized in their superconducting transport and
magnetic properties in magnetic field and in a temperature range of interest
for the MgB2 compound. The products have a granular morphology of composite
nature and their overall density affects their properties. The irreversibility
line, Bc1(T) values, magnetically measured current densities and the trapped
magnetic field are evaluated by susceptibility curves and hysteresis curves,
both obtained by SQUID magnetometry for samples of different density, up to 35K
and up to 5T applied magnetic field. The experimental results have been
compared with the best values reported in the literature for other bulk
sintering techniques.
