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<p>Rietveld refinement has been used to analyse phase evolution in BaFe<sub>10</sub>ZnZrO<sub>19</sub> (BZFO) and BaFe<sub>12</sub>O<sub>19</sub> (BFO) samples calcined between 900&#xa0;°C and 1200&#xa0;°C. Refinement revealed that BZFO consist of five segregated phases viz. Zn-Zr doped BFO, ZnFe<sub>2</sub>O<sub>4</sub>, ZrO<sub>2</sub>, BaZrO<sub>3</sub> and BaFeO<sub>3</sub> at 1100&#xa0;°C and 1150&#xa0;°C. In contrast, BFO samples consist only of BFO and Fe<sub>2</sub>O<sub>3</sub> phases. Both types of samples become phase pure at 1200&#xa0;°C. FESEM micrographs reveal pronounced secondary grain growth in BZFO samples and reduction in grain size (0.32–0.19&#xa0;µm) with dopant incorporation at 1200&#xa0;°C. EDX mapping confirmed the even spatial distribution of various elements in both type of samples. VSM data reveals that BFO (H<sub>c</sub> = 4536 Oe and M<sub>s</sub> = 51.56&#xa0;emu/g) samples exhibit superior magnetic characteristics as compared to BZFO (H<sub>c</sub> = 728 Oe and M<sub>s</sub> = 47.86&#xa0;emu/g) samples at 1200&#xa0;°C. The BFO and BZFO samples respectively show minimum <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2025_14986_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="64" /> </InlineMediaObject> <EquationSource Format="TEX">\(RL\left(dB\right)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>R</mi> <mi>L</mi> <mfenced close=")" open="("> <mi>d</mi> <mi>B</mi> </mfenced> </mrow> </math></EquationSource> </InlineEquation> values of -35.3&#xa0;dB (at 8.8&#xa0;GHz) and -36.6&#xa0;dB (at 9.5&#xa0;GHz), at 1200&#xa0;°C calcination. The data suggests an enhancement in microwave absorption capacity with a) dopant incorporation and b) increase in calcination temperature.</p>

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A comparative study of structural, magnetic and X-band microwave absorption characteristics of pure and Zn–Zr co-doped M-type barium hexaferrites samples

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Garima Sharda,
  • Swati Verma,
  • Anupinder Singh,
  • Paramjeet Kaur,
  • Pawandeep Kaur,
  • Sandeep Sharma,
  • Parambir Singh Malhi,
  • Sachin Kumar Godara,
  • Surinder Singh,
  • Satvir Singh,
  • Jahangeer Ahmed,
  • Norah Alhokbany,
  • Abhishek Kandwal,
  • Mandeep Singh

摘要

Rietveld refinement has been used to analyse phase evolution in BaFe10ZnZrO19 (BZFO) and BaFe12O19 (BFO) samples calcined between 900 °C and 1200 °C. Refinement revealed that BZFO consist of five segregated phases viz. Zn-Zr doped BFO, ZnFe2O4, ZrO2, BaZrO3 and BaFeO3 at 1100 °C and 1150 °C. In contrast, BFO samples consist only of BFO and Fe2O3 phases. Both types of samples become phase pure at 1200 °C. FESEM micrographs reveal pronounced secondary grain growth in BZFO samples and reduction in grain size (0.32–0.19 µm) with dopant incorporation at 1200 °C. EDX mapping confirmed the even spatial distribution of various elements in both type of samples. VSM data reveals that BFO (Hc = 4536 Oe and Ms = 51.56 emu/g) samples exhibit superior magnetic characteristics as compared to BZFO (Hc = 728 Oe and Ms = 47.86 emu/g) samples at 1200 °C. The BFO and BZFO samples respectively show minimum \(RL\left(dB\right)\) R L d B values of -35.3 dB (at 8.8 GHz) and -36.6 dB (at 9.5 GHz), at 1200 °C calcination. The data suggests an enhancement in microwave absorption capacity with a) dopant incorporation and b) increase in calcination temperature.