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Insights into high-temperature electrical property in rare earth disilicate ceramics
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DOI：10.1016/j.jeurceramsoc.2026.118721.png)
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Abstract
En 中文
Rare earth disilicate materials are considered to be promising candidates for aero-engine thermal barrier coatings. In specially, next generations gas turbine engines technology facilitates the attention on the in-situ integration design on the surface of turbine blades based on the thermal barrier coatings. However, there is still lack of comprehensive investigation in high-temperature electrical transport behavior of rare earth disilicates to date. Herein, by fabricating RE2Si2O7 (RE = Sc, Lu, Yb, Tm) ceramics, we find that these ceramics have an excellent electrical performance in a wide temperature range while possessing high temperature sensitivity for temperature sensor applications. All samples exhibit dense microstructures with well-developed grains and clear grain boundaries. The electrical property perfectly obeys the Arrhenius equation with a exceeding Pearson coefficient of 99% within the temperature range of 773 K to 1423 K and a sensitivity coefficient as high as 5842 (RE = Sc), 7263 (RE = Lu), 8378 (RE = Yb) and 7386 (RE = Tm) ppm/K at 1273 K. Subsequently, based on oxygen vacancy analysis and impedance spectroscopy, we propose that the compounds are mixed electronic and oxide ionic conductors to elucidate their thermal sensitivity mechanism. The results may accelerate the design of dual-functional RE2Si2O7 coating systems.
Keywords:
Disilicate
High-temperature
Electrical property
Sensitivity
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6.2
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