Influence of nonmagnetic cation substitution on magnetic order temperature in Y-type hexaferrites: Ba<sub>0.5</sub>Sr<sub>1.5</sub>Zn<sub>2</sub>Fe<sub>12</sub>O<sub>22</sub> and Ba<sub>0.5</sub>Sr<sub>1.5</sub>Zn<sub>2</sub>Al<sub>0.08</sub>Fe<sub>11.92</sub>O<sub>22</sub>
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