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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
Article
  • 34 Downloads

Abstract

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.

Keywords

Particle Size Inorganic Chemistry Fe2O3 Barium Reaction Temperature 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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