Particle Size Effects on Calorimetric and Magnetic Properties of the Ferromagnetic Phase in the Eutectic Composite Alloy of ZnSnAs2–MnAs Systemстатья
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Дата последнего поиска статьи во внешних источниках: 30 декабря 2020 г.
Аннотация:Magnetic and calorimetric properties of a eutectic alloy of ZnSnAs2–MnAs system are studieddepending on particle size in the range of magnetostructural transition temperatures of the ferromagneticphase MnAs. The particle sizes are varied by using different cooling rates as measured by a temperature-controldevice. The cooling rate is ~0.05°C/s under ordinary conditions and ~90°C/s under quenching with saltsystems having high heat conductivity. Simultaneous phase solidification, typical of eutectics, under highcooling rates yields nanosized (≤50 nm) MnAs grains. DSC curves for quenched samples, unlike for samplesprepared under ordinary conditions, have no thermal feature associated with α–β-MnAs magnetostructuraltransformation. The magnetization and Curie temperature have considerably different values in quenchedsamples and in samples prepared in an ordinary manner. The Curie temperature rises to 337 K and the coerciveforce increases as the particle size increases.