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2017 | 132 | 1 | 24-30
Article title

Magnetic Study of Phases in FeVO₄-Co₃V₂O₈ System

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EN
Abstracts
EN
Magnetic properties of four nFeVO₄/(1-n)Co₃V₂O₈ samples obtained in reactions between FeVO₄ and Co₃V₂O₈ (n = 0.96, 0.86, 0.84 and 0.83, samples designated S1, S3, S4, S5, respectively) have been investigated by DC magnetisation in field cooling and zero-field-cooling modes and EPR. DC magnetic susceptibility showed paramagnetic behavior of all samples in high-temperature range (T > 20 K) and transition to antiferromagnetic state at 16-18 K (depending on sample iron content). Additional magnetic freezing at 8 K was registered for S3-S5 samples containing larger amount of cobalt. The Curie-Weiss law in 100-300 K temperature range indicates that Co²⁺ is in the high-spin state (S = 3/2). From the parameters of the hysteresis loop observed for the samples it was calculated that 0.58% of all magnetic (Fe³⁺, Co²⁺) ions were involved in the ferromagnetic states. EPR spectra of the samples were recorded in high temperature range (T > 90 K). The temperature dependence of the spectral parameters (resonance field, linewidth, integrated intensity) suggested the Fe³⁺ high-spin ions coupled by antiferromagnetic interaction and clusters of ions play major role in EPR spectra.
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Contributors
author
  • Institute of Physics, West Pomeranian University of Technology, Szczecin, al. Piastów 48, 70-311 Szczecin, Poland
  • Institute of Physics, West Pomeranian University of Technology, Szczecin, al. Piastów 48, 70-311 Szczecin, Poland
author
  • Institute of Physics, West Pomeranian University of Technology, Szczecin, al. Piastów 48, 70-311 Szczecin, Poland
author
  • Institute of Physics, West Pomeranian University of Technology, Szczecin, al. Piastów 48, 70-311 Szczecin, Poland
  • Department of Inorganic and Analytical Chemistry, Faculty of Technology and Chemical Engineering, West Pomeranian University of Technology, Szczecin, al. Piastów 42, 70-065 Szczecin, Poland
author
  • Department of Electrical Engineering, Ajman University of Science and Technology, P.O. Box 346, Ajman, UAE
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bwmeta1.element.bwnjournal-article-appv132n1p05kz
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