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<p>La-excess-type lanthanum silicate doped with Fe (La<sub>10</sub>Si<sub>6-<i>x</i></sub>Fe<sub><i>x</i></sub>O<sub>27</sub>, <i>x</i> = 0, 0.2, 0.4, 0.6) was synthesized through planetary ball milling. The resulting materials were systematically characterized for their crystal structure, infrared spectral features, microstructural properties, and electrical conduction behavior. It is revealed that La<sub>10</sub>Si<sub>6-<i>x</i></sub>Fe<sub><i>x</i></sub>O<sub>27</sub> remains apatite type, and Fe is doped into Si site. The surface particles of the La<sub>10</sub>Si<sub>6-<i>x</i></sub>Fe<sub><i>x</i></sub>O<sub>27</sub> ceramic sample are without holes, and the particles are arranged tightly and evenly. The element distribution of La<sub>10</sub>Si<sub>6-<i>x</i></sub>Fe<sub><i>x</i></sub>O<sub>27</sub> ceramic samples is uniform, and the element content conforms to the stoichiometric ratio. Both total and electronic conductivities exhibit a gradual enhancement with increasing iron content. A sensor was fabricated using dense diffusion barrier of La<sub>10</sub>Si<sub>5.4</sub>Fe<sub>0.6</sub>O<sub>27</sub> and solid electrolyte of La<sub>10</sub>Si<sub>6</sub>O<sub>27</sub>. Limiting current meets certain relationship with temperature and oxygen volume fraction, such as lg<i>I</i><sub>L</sub> (mA) =  − 0.56 − 1.36 × 1000/<i>T</i> (K<sup>−1</sup>) and <i>I</i><sub>L</sub> (mA) = 3.10 + 0.69 × <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11581_2025_6370_Article_IEq1.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="16" /> </InlineMediaObject> <EquationSource Format="TEX">\(\varphi\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>φ</mi> </math></EquationSource> </InlineEquation>(O<sub>2</sub>) (%). The sensor exhibits CO<sub>2</sub>/H<sub>2</sub>O-insensitive limiting current.</p>

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Fe-doped apatite-type lanthanum silicate (La10Si6-xFexO27): synthesis, mixed conduction, and limiting-current oxygen sensor performance

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Dongliang Li,
  • Xiangnan Wang

摘要

La-excess-type lanthanum silicate doped with Fe (La10Si6-xFexO27, x = 0, 0.2, 0.4, 0.6) was synthesized through planetary ball milling. The resulting materials were systematically characterized for their crystal structure, infrared spectral features, microstructural properties, and electrical conduction behavior. It is revealed that La10Si6-xFexO27 remains apatite type, and Fe is doped into Si site. The surface particles of the La10Si6-xFexO27 ceramic sample are without holes, and the particles are arranged tightly and evenly. The element distribution of La10Si6-xFexO27 ceramic samples is uniform, and the element content conforms to the stoichiometric ratio. Both total and electronic conductivities exhibit a gradual enhancement with increasing iron content. A sensor was fabricated using dense diffusion barrier of La10Si5.4Fe0.6O27 and solid electrolyte of La10Si6O27. Limiting current meets certain relationship with temperature and oxygen volume fraction, such as lgIL (mA) =  − 0.56 − 1.36 × 1000/T (K−1) and IL (mA) = 3.10 + 0.69 ×  \(\varphi\) φ (O2) (%). The sensor exhibits CO2/H2O-insensitive limiting current.