  The effect of the Fe-Ga ratio on the magnetic and electric properties of the
multiferroic Ga2-xFexO3 compound has been studied in order to determine the
composition range exhibiting magnetic and electric orders coexistence and their
critical temperatures. A magnetoelectric phase diagram, showing the evolution
of both the Neel magnetic ordering temperature and the electric ordering
temperature, versus the iron content has been established for x values between
0.9 and 1.4. While the ferrimagnetic Neel temperature increases with the iron
content, the electric ordering temperature shows an opposite trend. The
electric polarization has been found to exist far above room temperature for
the x value of 1.1 composition which shows the highest observed electric
ordering temperature of approx. 580K. The compounds with x values of 1.3 and
1.4 are ferrimagnetic-electric relaxors with both properties coexisting at room
temperature.
