SrAlxFe12-xO19 (x = 0–4) were synthesized via a mechanochemical activation.
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Deterioration of magnetic properties by milling depends on Al content.
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A subsequent annealing treatment in NaCl melt at 1000 °C promotes recrystallization.
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Annealing treatment in NaCl melt at 1000 °C increases magnetic properties.
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Coercivity is explained by single domain particles and correlated to initial curve.
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