Achieving high‐performance Y _2/3 Cu ₃ Ti ₄ O ₁₂ thermistor ceramics with high orientation by using a sol‒gel derived strategy

Abstract High thermal stability and a wide temperature range are critical for thermistors used in extreme environments. Y 2/3 Cu 3 Ti 4 O 12 (YCTO) ceramics, known for their high room‐temperature resistance and structural stability, are promising candidates for such applications. However, inherent defects and lattice distortions limit its performance at high temperatures. Herein, to address this significant challenge, we propose a sol–gel derived strategy for inducing cubic growth of Y 2/3 Cu 3 Ti 4 O 12 ‐CB (YCTO‐CB) grains using coconut water and bone glue. The growth of {100} crystal facets has a positive effect on the inhibition of lattice deformation and dislocation, which plays a vital role in improving the oxidation resistance and suppressing the resistance attenuation. The YCTO‐CB ceramics exhibit superior thermosensitive characteristics in broad temperature range of 25°C–600°C, and have a significantly lower aging coefficient (0.27%) compared to Y 2/3 Cu 3 Ti 4 O 12 ‐B (YCTO‐B ceramics prepared by adding bone glue only) ceramics (8.1%). The study also reveals a unique “coffee‐ring” growth mechanism, where sintering‐induced dislocation repair and atomic rearrangement lead to the formation of low‐energy {100} facets. These findings highlight the potential of crystal facet engineering and bio‐additives in optimizing thermosensitive materials for high‐temperature applications, offering valuable insights for advancing thermistor technology in industrial electronics.