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<p>In this study, a phenomenological model is used to predict the magnetocaloric effect (MCE) of two CoFe<sub>2</sub>/MgO nanocomposite samples exposed to nitridation reactions at nitridation temperatures of 400 and 500&#xa0;°C (they are indicated as N400 and N500, respectively). The findings show that, within the investigated temperature range, the MCE of the N400 sample is conventional with full-width at half-maximum (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="339_2025_8497_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="61" /> </InlineMediaObject> <EquationSource Format="TEX">\(\delta {\text{T}}_{{{\text{FWHM}}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>δ</mi> <msub> <mtext>T</mtext> <mtext>FWHM</mtext> </msub> </mrow> </math></EquationSource> </InlineEquation>) of 94&#xa0;K. The N500 sample does, however, actually contain both inverse and conventional MCE with <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="339_2025_8497_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="61" /> </InlineMediaObject> <EquationSource Format="TEX">\(\delta {\text{T}}_{{{\text{FWHM}}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>δ</mi> <msub> <mtext>T</mtext> <mtext>FWHM</mtext> </msub> </mrow> </math></EquationSource> </InlineEquation> of 71&#xa0;K and 24&#xa0;K, respectively. Interestingly, the changing nitridation temperature during sample preparation allows for significant tailoring of the MCE of a CoFe2/MgO nanocomposite sample. The MCE of the N400 and N500 samples, in particular, spans a wide range of temperatures, including room temperature and cryogenic temperatures, making them notable magnetocaloric materials. Consequently, N400 and N500 samples can be used food-refrigeration and liquefying both nitrogen and helium gases.</p>

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The remarkable impact of nitridation temperature on the magnetocaloric effect of CoFe2/MgO matrix

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Mahmoud A. Hamad,
  • Hatem R. Alamri

摘要

In this study, a phenomenological model is used to predict the magnetocaloric effect (MCE) of two CoFe2/MgO nanocomposite samples exposed to nitridation reactions at nitridation temperatures of 400 and 500 °C (they are indicated as N400 and N500, respectively). The findings show that, within the investigated temperature range, the MCE of the N400 sample is conventional with full-width at half-maximum ( \(\delta {\text{T}}_{{{\text{FWHM}}}}\) δ T FWHM ) of 94 K. The N500 sample does, however, actually contain both inverse and conventional MCE with \(\delta {\text{T}}_{{{\text{FWHM}}}}\) δ T FWHM of 71 K and 24 K, respectively. Interestingly, the changing nitridation temperature during sample preparation allows for significant tailoring of the MCE of a CoFe2/MgO nanocomposite sample. The MCE of the N400 and N500 samples, in particular, spans a wide range of temperatures, including room temperature and cryogenic temperatures, making them notable magnetocaloric materials. Consequently, N400 and N500 samples can be used food-refrigeration and liquefying both nitrogen and helium gases.