  Magnesium diboride crystals were grown with low melting alloy flux. The
sample with superconductivity at 38.3 K was prepared in the zinc-magnesium flux
and another sample with superconductivity at 34.11 K was prepared in the
cadmium-magnesium flux. MgB4 was found in both samples, and MgB4's
magnetization curve being above zero line had not superconductivity. Magnesium
diboride prepared by these two methods is all flaky and irregular shape and low
quality of single crystal. However, these two metals should be the optional
flux for magnesium diboride crystal growth. The study of single crystal growth
is very helpful for the future applications.
