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<p>The phase structure, microstructure, dielectric, piezoelectric, and ferroelectric characteristics of Sm doped 71Pb (Mg<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>-29PbTiO<sub>3</sub> (71PMN–29PT) ceramics were comprehensively analyzed in relation to the impact of four distinct sintering techniques: Hot Press (HP), Spark Plasma Sintering (SPS), Cold Isostatic Press (CIP), and Cold Press (CP). The sample prepared by HP method showed the highest values for the dielectric constant (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2025_15181_Article_IEq1.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="TEX">\({\upvarepsilon }_{\text{r}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi mathvariant="normal">ε</mi> <mtext>r</mtext> </msub> </math></EquationSource> </InlineEquation>=11566), piezoelectric charge coefficient (d<sub>33</sub> = 990 pC/N), and planar electromechanical coupling factors (<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2025_15181_Article_IEq2.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{k}}_{\text{p}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>k</mtext> <mtext>p</mtext> </msub> </math></EquationSource> </InlineEquation>=0.65) at room temperature. The highest and lowest densities are observed in the HP and CP samples, respectively. In the HP technique, uniaxial pressure applied simultaneously with temperature promotes grain consolidation, leading to the formation of ceramics with a dense microstructure and the greatest grain size. High density and fully dense microstructure observed in the micrographs of the HP, SPS, and CIP samples highlight the significant enhancement in the dielectric and piezoelectric properties of these samples relative to the CP one.</p>

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Influence of the sintering method on dielectric, piezoelectric and ferroelectric properties of Sm-doped PMN-PT relaxor ceramics

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • Yahya Azizi,
  • Mohsen Yazdanmehr,
  • Hossein Ahmadvand,
  • Mohammad Reza Kazerani Vahdani,
  • Hassan Ahmadvand

摘要

The phase structure, microstructure, dielectric, piezoelectric, and ferroelectric characteristics of Sm doped 71Pb (Mg1/3Nb2/3)O3-29PbTiO3 (71PMN–29PT) ceramics were comprehensively analyzed in relation to the impact of four distinct sintering techniques: Hot Press (HP), Spark Plasma Sintering (SPS), Cold Isostatic Press (CIP), and Cold Press (CP). The sample prepared by HP method showed the highest values for the dielectric constant ( \({\upvarepsilon }_{\text{r}}\) ε r =11566), piezoelectric charge coefficient (d33 = 990 pC/N), and planar electromechanical coupling factors ( \({\text{k}}_{\text{p}}\) k p =0.65) at room temperature. The highest and lowest densities are observed in the HP and CP samples, respectively. In the HP technique, uniaxial pressure applied simultaneously with temperature promotes grain consolidation, leading to the formation of ceramics with a dense microstructure and the greatest grain size. High density and fully dense microstructure observed in the micrographs of the HP, SPS, and CIP samples highlight the significant enhancement in the dielectric and piezoelectric properties of these samples relative to the CP one.