The temperature dependence of the EPR spectrum for the alpha-phase of
iron tungstate has been investigated in the temperature range of 40-26
0 K. At temperatures between T-1 approximate to 250 K and T-2 approxim
ate to 205 K where the antiferromagnetic phase transition occurs, a re
latively narrow EPR line arising from the dominant iron(III) species h
as emerged, gaining intensity with the temperature increase. Its linew
idth temperature evolution could be described by Huber equation, with
T-N = 200 K, which is consistent with the peak seen in magnetic suscep
tibility measurements, while the corresponding g-factor shifts to high
er fields reflecting the build-up of internal field emerging from incr
easing short-range order in the spin system. At temperatures lower tha
n T-2, a very broad and distorted EPR line with temperature dependent
g-factor and linewidth has been observed reflecting the corresponding
rise of the magnetic susceptibility below the antiferromagnetic phase
transition, presumably arising from magnetic clusters embedded in the
antiferromagnetic background.