  GaFeO3, AlFeO3 and related oxides are ferrimagnetic exhibiting
magnetodielectric effect. There has been no evidence to date for
ferroelectricity and hence multiferroicity in these oxides. We have
investigated these oxides as well as oxides of the composition
Al1-x-yGaxFe1+yO3 (x = 0.2, y = 0.2) for possible ferroelectricity by carrying
out pyroelectric measurements. These measurements establish the occurrence of
ferroelectricity at low temperatures below the N\`eel temperature in these
oxides. They also exhibit significant magnetoelectric effect. We have tried to
understand the origin of ferroelectricity based on non-centrosymmetric magnetic
ordering and disorder by carrying out first-principles calculations.
