Multiscale Structural Regulation Enables Ultra-Rapid and Stable High-Temperature Sensing in Fergusonite Ceramics

Abstract

Precise temperature sensing in extreme high-temperature environments, such as those encountered in energy and aerospace applications, demands high-performance thermosensitive materials, among which fergusonite-type oxide ceramics are prominent candidates. However, due to the complicated local structural design, simultaneously achieving rapid response/recovery, high sensitivity and accuracy under high-temperature conditions remains a challenge. Herein, second-phase precipitation (cubic CeO₂) and B-site modulation were introduced in CaCe₂Nb_2-xTa_xMoO₁₂ ceramics by regulating solid solubility and sintering protocols. Synergistic optimization of grain boundary and defect structure enabled carrier migration channels and precise thermal activation control. Exceptional temperature sensitivity and measurement accuracy were achieved over a broad temperature range (153-773 K), with a rapid response time of 1.82 s and recovery time of 0.76 s at 773 K. Notably, these ceramics demonstrate remarkable stability during thermal cycling and prolonged high-temperature operation. This work presents new material candidates and multiscale regulation strategies for developing hightemperature thermosensitive materials surpassing conventional ceramic systems.