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<p>Aliovalent substitution molybdenum of tantalum into the La<sub>5</sub>Mo<sub>3–x</sub>Ta<sub>x</sub>O<sub>16.5–x/2</sub> composition (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) enabled the synthesis of a previously undescribed Ta-contained phase with the Nd<sub>5</sub>Mo<sub>3</sub>O<sub>16+δ</sub> type structure. Calcination of the initial oxides at 1250&#xa0;°C yielded the single-phase composition La<sub>5</sub>Mo<sub>2.4</sub>Ta<sub>0.6</sub>O<sub>16+δ</sub>. The resulting phase was studied by Rietveld refinement, IR spectroscopy, scanning electron microscopy, and complex impedance measurements. The bulk conductivity of La<sub>5</sub>Mo<sub>2.4</sub>Ta<sub>0.6</sub>O<sub>16+δ</sub> sintered at 1250&#xa0;°C is an order of magnitude higher than the conductivity of the low-temperature LAMOX modification and slightly lower than that of 8% YSZ, and reaches 10<sup>− 2</sup> S/cm at 900&#xa0;°C. Dense ceramic La<sub>5</sub>Mo<sub>2.4</sub>Ta<sub>0.6</sub>O<sub>16+δ</sub> sintered at 1400&#xa0;°C is characterized by higher bulk conductivity (11.6 mS/cm at 600&#xa0;°C and 850 mS/cm at 900&#xa0;°C) than the high-temperature cubic modification of LAMOX and yttrium-stabilized zirconia. Hebb–Wagner polarization experiments show that La<sub>5</sub>Mo<sub>2.4</sub>Ta<sub>0.6</sub>O<sub>16+δ</sub> exhibits mixed oxide-ion/electronic transport in air, with electronic transport numbers tₑ<sub>l</sub> = 0.08–0.15.</p>

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Synthesis and conductivity of new tantalum-containing lanthanum molybdate with Nd5Mo3O16+δ-type structure

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Chebyshev K. A.,
  • Golubovich V. S.,
  • Rubtsova A. S.,
  • Berezhnaya T. S.,
  • Pasechnik L. V.

摘要

Aliovalent substitution molybdenum of tantalum into the La5Mo3–xTaxO16.5–x/2 composition (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) enabled the synthesis of a previously undescribed Ta-contained phase with the Nd5Mo3O16+δ type structure. Calcination of the initial oxides at 1250 °C yielded the single-phase composition La5Mo2.4Ta0.6O16+δ. The resulting phase was studied by Rietveld refinement, IR spectroscopy, scanning electron microscopy, and complex impedance measurements. The bulk conductivity of La5Mo2.4Ta0.6O16+δ sintered at 1250 °C is an order of magnitude higher than the conductivity of the low-temperature LAMOX modification and slightly lower than that of 8% YSZ, and reaches 10− 2 S/cm at 900 °C. Dense ceramic La5Mo2.4Ta0.6O16+δ sintered at 1400 °C is characterized by higher bulk conductivity (11.6 mS/cm at 600 °C and 850 mS/cm at 900 °C) than the high-temperature cubic modification of LAMOX and yttrium-stabilized zirconia. Hebb–Wagner polarization experiments show that La5Mo2.4Ta0.6O16+δ exhibits mixed oxide-ion/electronic transport in air, with electronic transport numbers tₑl = 0.08–0.15.