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(a) Logarithm of (1/ε-1/εd) as a function of logarithm of (T-Td) at 10 kHz. and (b) logarithm of (1/ε-1/εm) as a function of logarithm of (T-Tm) at 100 kHz for the SrFe12O19 ceramic being sintered at 1150°C for 1 hour and subsequently annealed in O2 for 9 hours with 3 steps wise.
