Degradation of passivated iron particles in humid atmospheres

Ching Shan Jung, Srini Raghavan, Srini Raghavan, Roy Emrick

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The interaction of water vapor with passivated iron particles used in magnetic recording was studied under different temperature and humidity conditions using a flow microcalorimetric (FMC) technique. Water uptake by passivated iron particles increased linearly with relative humidity ranging from 30% to 70% RH in the temperature range 30°C to 70°C. Mossbauer measurements showed that the ratio of core iron to oxide iron decreased during aging. Particles coated with hydrophobic PVC exhibited much less water uptake than particles coated with a less hydrophobic polymer, poly(vinyl alcohol).

Original languageEnglish (US)
Pages (from-to)4065-4067
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number6 pt 1
Publication statusPublished - Nov 1994


ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

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