On the investigation of the ordering processes in iron-cobalt alloys by heat temperature spectra

Velíšek, J.

doi:10.1007/bf01697123

Cited by 5 publications

(1 citation statement)

References 4 publications

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“…The Fe 70 Co 30 composition leaves the characteristics of other compositions with the presence of very small anomalous effect of temperature. This result is in good agreement with Velisek,9 showed that based on the calorimetric studies, while Fe 50 Co 50 composition shows 550°C anomaly accompanied with the chance of specific heat at this temperature, Fe 3 Co composition shows a small degree of anomaly at this temperature. Our measurements on annealed samples showed that while the anomaly is observed in compositions ͑rather than Fe 70 Co 30 composition͒ not depending on the initial structure is ordered or metastable disordered, initially ordered Fe 70 Co 30 composition revealed no anomaly.…”

Section: Resultssupporting

confidence: 91%

Magnetic properties and ordering in C-coated FexCo1−x alloy nanocrystals

Turgut

Scott

Huang

et al. 1998

Journal of Applied Physics

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C-coated FexCo1−x (x=0.50, 0.45, 0.40, 0.35, 0.30, 0.25) nanoparticles were produced using a rf plasma torch. The only C source was acetylene used as a carrier gas. Structural determination by x-ray diffraction indicated a single disordered bcc α-FeCo phase along with graphitic C for all compositions. A Scherrer analysis of the peak widths revealed particles to have an average diameter of 50 nm. A broad log-normal size distribution was found from transmission electron microscopy observations. Magnetic hysteresis loops have been measured to temperatures exceeding 1050 K and revealed relatively high room temperature coercivities (200–400 Oe), with a strong compositional variation similar to that observed in bulk alloys. Larger coercivities are consistent with particles near the monodomain size for these alloys. The temperature dependence of the magnetization revealed the effects of atomic ordering. The variation of the saturation magnetization as a function of temperature showed a discontinuity near the bulk order–disorder (α→α′) transformation temperature, as well as loss of magnetization at the α→γ structural phase transition temperature. Other features of M(T) near 500–550 °C are consistent with prior observations of a “550 °C structural anomaly” which has been observed in bulk alloys with less than perfect order.

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Section: Resultssupporting

confidence: 91%