Magnetic characterization of mixed phases in FeVO4–Co3V2O8 system
PBN-AR
Instytucja
Wydział Technologii i Inżynierii Chemicznej (Zachodniopomorski Uniwersytet Technologiczny w Szczecinie)
Informacje podstawowe
Główny język publikacji
angielski
Czasopismo
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS (25pkt w roku publikacji)
ISSN
0022-3697
EISSN
Wydawca
PERGAMON-ELSEVIER SCIENCE LTD
DOI
Rok publikacji
2018
Numer zeszytu
Strony od-do
156–161
Numer tomu
115
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
angielski
chemical synthesis
magnetic properties
electron paramagnetic resonance
inorganic compounds
Streszczenia
Język
angielski
Treść
Dynamic and static magnetic properties of four nFeVO4/(1-n)Co3V2O8 composites obtained in reactions between nFeVO4 and (1-n)Co3V2O8 (n ¼ 0.82, 0.80, 0.78 and 0.76) have been investigated by dc magnetometry and electron paramagnetic resonance (EPR). All samples were diphase containing both the howardevansite-type and the lyonsite-type phases in different proportions. Dc magnetic susceptibility study showed the Curie-Weiss paramagnetic behavior with strong antiferromagnetic (AFM) interaction in the high-temperature range and the phase transition to the AFM state at low temperatures. The calculated effective magnetic moment could be justified by the presence of high spin Fe3+ and Co2+ ions. The appearance of hysteresis loop in isothermal magnetisation at low temperature indicates the existence of the ferromagnetic component in all four samples, but only 0.5% of all magnetic ions are involved in this phase. EPR spectra recorded in high-temperature range (T > 90 K) consisted of a single broad line centred at ~3.2 kG. The fitting of observed spectra with two Gaussian lineshape functions allowed to study the temperature dependence of EPR parameters (resonance field, linewidth, integrated intensity). This analysis suggests that EPR signal arises from two spin subsystems: paramagnetic Fe3þ ions subjected to AFM interaction and AFM spin pairs/clusters of iron/cobalt visible only at high temperatures. At low temperatures two transitions to AFM states, due to the mixture of two structural phases, are registered in magnetic susceptibility measurements.
Inne
System-identifier
PANEL-1006021
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