Scholarlink

<p>This study investigates the thermophysical properties of gadolinium (Gd), terbium (Tb), and their binary compounds Gd<sub>x</sub>Tb<sub>(1-x)</sub> (<i>x</i> = 0.25, 0.50, 0.75) using mean field theory. The study focuses on calculating magnetocaloric parameters, including magnetic entropy, its variation with magnetic field, specific heat, and the adiabatic temperature change, across magnetic field (<i>B</i>) intensities from 0 to 9 T. The findings indicate that the magnetic entropy has a considerable response to the applied magnetic field, demonstrating a 9.28% reduction in magnetic entropy for Gd at a temperature of 300 K when the field strength escalates from 1.5 to 9 T. Tb has a larger <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_7051_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="35" /> </InlineMediaObject> <EquationSource Format="TEX">\(\Delta {S}_{\text{m}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">Δ</mi> <msub> <mi>S</mi> <mtext>m</mtext> </msub> </mrow> </math></EquationSource> </InlineEquation> than Gd under similar conditions. In Gd<sub>x</sub>Tb<sub>(1-x)</sub> compounds, increasing Gd concentration results in a higher Curie temperature, approaching pure Gd, while the peak <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_7051_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="37" /> </InlineMediaObject> <EquationSource Format="TEX">\(\Delta {T}_{\text{ad}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">Δ</mi> <msub> <mi>T</mi> <mtext>ad</mtext> </msub> </mrow> </math></EquationSource> </InlineEquation> shows a little decline. The peak values of <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10948_2025_7051_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="37" /> </InlineMediaObject> <EquationSource Format="TEX">\(\Delta {T}_{\text{ad}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">Δ</mi> <msub> <mi>T</mi> <mtext>ad</mtext> </msub> </mrow> </math></EquationSource> </InlineEquation> are 6 K, 5.86 K, and 5.76 K for <i>x</i> values of 0.25, 0.5, and 0.75 in Gd<sub>x</sub>Tb<sub>(1-x)</sub>, respectively, at <i>B</i> 1.5 T. Moreover, Tb demonstrates a significantly higher relative cooling power than Gd, being approximately 34.91% higher at a given <i>B</i> of 1.5 T, whereas Gd and Gd-rich compounds display higher refrigeration capacity in the 250–320 K range. These results provide theoretical insights into the magnetic field–dependent magnetocaloric behavior of Gd, Tb, and Gd<sub>x</sub>Tb<sub>(1-x)</sub> compounds, while highlighting the compositional effects in Gd<sub>x</sub>Tb<sub>(1-x)</sub> compounds.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Assessing the Thermophysical Properties of Gd, Tb, and GdxTb(1-x) Materials for Magnetic Cooling Application

  • 期刊论文

  • 发表日期：

    2025年9月22日

查看全文
  • Prakash Chandra Singh,
  • Pabitra Halder

摘要

This study investigates the thermophysical properties of gadolinium (Gd), terbium (Tb), and their binary compounds GdxTb(1-x) (x = 0.25, 0.50, 0.75) using mean field theory. The study focuses on calculating magnetocaloric parameters, including magnetic entropy, its variation with magnetic field, specific heat, and the adiabatic temperature change, across magnetic field (B) intensities from 0 to 9 T. The findings indicate that the magnetic entropy has a considerable response to the applied magnetic field, demonstrating a 9.28% reduction in magnetic entropy for Gd at a temperature of 300 K when the field strength escalates from 1.5 to 9 T. Tb has a larger \(\Delta {S}_{\text{m}}\) Δ S m than Gd under similar conditions. In GdxTb(1-x) compounds, increasing Gd concentration results in a higher Curie temperature, approaching pure Gd, while the peak \(\Delta {T}_{\text{ad}}\) Δ T ad shows a little decline. The peak values of \(\Delta {T}_{\text{ad}}\) Δ T ad are 6 K, 5.86 K, and 5.76 K for x values of 0.25, 0.5, and 0.75 in GdxTb(1-x), respectively, at B 1.5 T. Moreover, Tb demonstrates a significantly higher relative cooling power than Gd, being approximately 34.91% higher at a given B of 1.5 T, whereas Gd and Gd-rich compounds display higher refrigeration capacity in the 250–320 K range. These results provide theoretical insights into the magnetic field–dependent magnetocaloric behavior of Gd, Tb, and GdxTb(1-x) compounds, while highlighting the compositional effects in GdxTb(1-x) compounds.