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Year 2005, Month 1 (Section Full Articles, Page 75)

Synthesis of glass ceramics containing finely dispersed particles of aluminum-doped M-type strontium hexaferrite

D. D. Zaitsev,(a)* L. A. Trusov,(a) P. E. Kazin,(b) and Yu. D. Tretyakova,(b)

Glasses with nominal compositions SrFe10Al2O19+4(SrB2O4+Sr2B2O5) (1) and SrFe9Al3O19+4(SrB2O4+Sr2B2O5) (2) were prepared by rapid quenching of melts. Thermal treatment of glass samples at 600—900 °C resulted in crystallization of the magnetic phase SrFe12–xAlxO19 (x = 1.1±0.1) and strontium borates. Platelet hexaferrite particles with average sizes from (250×60) nm2 to (450×140) nm2 were prepared. The coercive force of glass ceramics is 580 and 475 kA m–1 for glasses 1 and 2, respectively. The coercive force of 580 kA m–1 is the highest known value compared to hexaferrite particles prepared earlier by glass crystallization.

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