Ontology type: schema:ScholarlyArticle
2001-07
AUTHORS ABSTRACT
The emission Mössbauer spectra of Co3−xO4 defect films are measured in external magnetic fields at strengths of 0.6–3.5 T. It is shown that the memory effect is observed in the spectra of Co3−xO4 defect films after exposure to an external magnetic field. At temperatures above the Néel temperature TN=26 K, the memory effect manifests itself in an increase in the relative contribution from the spectral line of the tetrahedral A sublattice in the spinel structure of Co3−xO4 crystallites ([Co0.832+]tetr[Co2.203+]octO4 and [Co0.952+]tetr[Co2.103+]octO4 prior to and after the magnetic field treatment, respectively). The isomer shifts δ and the quadrupole splitting ΔE of the spectral lines for both A and B sublattices also change from δA=−0.19 mm/s, δB=−0.31 mm/s, and ΔEB=0.83 mm/s to the values δA=−0.24 mm/s, δB=−0.33 mm/s, and ΔEB=0.60 mm/s, which are close to δ and ΔE for stoichiometric Co3O4 oxide. In the low-temperature spectra (T
1291-1298
http://scigraph.springernature.com/pub.10.1134/1.1386468
DOIhttp://dx.doi.org/10.1134/1.1386468
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"description": "The emission M\u00f6ssbauer spectra of Co3\u2212xO4 defect films are measured in external magnetic fields at strengths of 0.6\u20133.5 T. It is shown that the memory effect is observed in the spectra of Co3\u2212xO4 defect films after exposure to an external magnetic field. At temperatures above the N\u00e9el temperature TN=26 K, the memory effect manifests itself in an increase in the relative contribution from the spectral line of the tetrahedral A sublattice in the spinel structure of Co3\u2212xO4 crystallites ([Co0.832+]tetr[Co2.203+]octO4 and [Co0.952+]tetr[Co2.103+]octO4 prior to and after the magnetic field treatment, respectively). The isomer shifts \u03b4 and the quadrupole splitting \u0394E of the spectral lines for both A and B sublattices also change from \u03b4A=\u22120.19 mm/s, \u03b4B=\u22120.31 mm/s, and \u0394EB=0.83 mm/s to the values \u03b4A=\u22120.24 mm/s, \u03b4B=\u22120.33 mm/s, and \u0394EB=0.60 mm/s, which are close to \u03b4 and \u0394E for stoichiometric Co3O4 oxide. In the low-temperature spectra (TDownload the RDF metadata as: json-ld nt turtle xml License info
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