Inorganic Materials

, Volume 38, Issue 11, pp 1183–1185 | Cite as

Topochemical Memory Effect in the Formation of Barium Hexaferrite

  • F. A. Kulikov
  • N. N. Oleinikov
  • G. P. Murav'eva
  • Yu. D. Tret'yakov


The topochemical memory effect in Ba(NO3)2 : Fe2O3 = 1 : 6 reaction mixtures containing α-Fe2O3 with different particle sizes was studied at low (540–630°C; the main reaction product BaFe2O4) and high (900–930°C; the main product, BaFe12O19) reaction temperatures. The results indicate that the particle size of Fe2O3 has a significant effect on the BaFe2O4 yield in the low-temperature solid-state reaction (<585°C), in contrast to the liquid-assisted reaction (>585°C). In the subsequent high-temperature solid-state reaction (900–930°C), the BaFe12O19 yield depends on the particle size of Fe2O3 , regardless of the initial reaction temperature. It is shown that, to achieve a high BaFe12O19 yield, the process conditions should be optimized in both the low- and high-temperature stages.


Particle Size Inorganic Chemistry Fe2O3 Barium Reaction Temperature 
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Copyright information

© MAIK “Nauka/Interperiodica” 2002

Authors and Affiliations

  • F. A. Kulikov
    • 1
  • N. N. Oleinikov
    • 1
  • G. P. Murav'eva
    • 1
  • Yu. D. Tret'yakov
    • 1
  1. 1.Moscow State UniversityMoscowRussia

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