Scholarlink

<p>The (La<sub>0.2</sub>Sm<sub>0.2</sub>Gd<sub>0.2</sub>Y<sub>0.2</sub>Yb<sub>0.2</sub>)<sub>3</sub>Nb<sub>0.5</sub>Ta<sub>0.5</sub>O<sub>7</sub> was designed and synthesized adopting chemical method and high-temperature calcining technique. Its phase structure, micromorphology, element content and type, and thermophysical and mechanical performances were studied. The final conclusions indicate that the achieved high-entropy compound has a sole pyrochlore lattice, dense microstructure and mean distribution of element. Because of the aggravated phonon scattering caused by the substitutional cations, oxygen vacancies and lattice distortion, its room and high-temperature thermal conductivities were less than that of Y<sub>2</sub>O<sub>3</sub> stabilized zirconia (YSZ). The high-entropy compound also exhibits a great thermal expansion coefficient and phase steadiness until 1200&#xa0;°C, its elastic modulus was higher than that of YSZ, while its fracture toughness and microhardness were smaller than corresponding values of YSZ.</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

(La0.2Sm0.2Gd0.2Y0.2Yb0.2)3Nb0.5Ta0.5O7: Novel High-Entropy Oxide for Thermal Barrier Coatings

  • 期刊论文

  • 发表日期：

    2026年1月5日

查看全文
  • Renxi Hu,
  • Hongsong Zhang,
  • Ye Guohua,
  • Bingbing Fan,
  • Haoming Zhang,
  • Keke Guan,
  • Chenglong Wang,
  • Liwei Ni,
  • Mingfei Wang,
  • Kun Liu,
  • HaiGuang Li

摘要

The (La0.2Sm0.2Gd0.2Y0.2Yb0.2)3Nb0.5Ta0.5O7 was designed and synthesized adopting chemical method and high-temperature calcining technique. Its phase structure, micromorphology, element content and type, and thermophysical and mechanical performances were studied. The final conclusions indicate that the achieved high-entropy compound has a sole pyrochlore lattice, dense microstructure and mean distribution of element. Because of the aggravated phonon scattering caused by the substitutional cations, oxygen vacancies and lattice distortion, its room and high-temperature thermal conductivities were less than that of Y2O3 stabilized zirconia (YSZ). The high-entropy compound also exhibits a great thermal expansion coefficient and phase steadiness until 1200 °C, its elastic modulus was higher than that of YSZ, while its fracture toughness and microhardness were smaller than corresponding values of YSZ.