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The Ca-La-Co-doped M-type Sr-hexaferrite (Sr0.1Ca0.45La0.45Fe11.7Co0.3O19) decomposed into three different phases of orthorhombic, spinel, and hexagonal structures after annealing at 1200°C in nitrogen atmosphere while the non-substituted SrFe12O19 maintained the hexagonal structure after annealing at the same condition. It is suggested that the charge-imbalance substitution of La3+/Co2+=1.5 induces...
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