@article{Pan2025, 
author = {Zhao Pan and Fengyi Zhou and Mengqi Ye and Duo Wang and Qiumin Liu and Takumi Nishikubo and Xubin Ye and Xiao Wang and Jin Liu and Nianpeng Lu and Shogo Kawaguchi and Masaki Azuma and Youwen Long},
title = {Realizing negative thermal expansion over an extended temperature range in PbTiO3-based perovskites},
year = {2025},
journal = {Journal of Advanced Ceramics},
volume = {14},
number = {7},
pages = {9221096},
keywords = {negative thermal expansion (NTE), PbTiO3 (PT)-based perovskites, Curie temperature (TC), high-pressure and high-temperature method, density functional calculations},
url = {https://www.sciopen.com/article/10.26599/JAC.2025.9221096},
doi = {10.26599/JAC.2025.9221096},
abstract = {Negative thermal expansion (NTE) is fascinating, as it involves a material’s volume contraction rather than expansion upon heating. Although NTE lattices typically have highly flexible frameworks, the magnitude of NTE is often very small, and they frequently exhibit a narrow temperature range for controllable NTEs. It remains a great challenge to achieve large NTE while maintaining a wide temperature operation range from the currently available materials. Herein, we present a novel PbTiO3 (PT)-based perovskite system, (1−x)PbTiO3–xBiYbO3, synthesized via a distinctive high-pressure and high-temperature technique. Compared with pristine PbTiO3 (c/a = 1.064), the system exhibited unusual enhanced tetragonalities. Consequently, NTE over an extended temperature range has been realized in 0.95PbTiO3–0.05BiYbO3 ( α¯V = −2.18×10−5 K−1, 300–820 K) and 0.90PbTiO3−0.10BiYbO3 ( α¯V = −1.85×10−5 K−1, 300–850 K) compared with that of pristine PbTiO3 ( α¯V = −1.99×10−5 K−1, 300–763 K). Our experimental and theoretical studies indicate that the improved tetragonality and expanded NTE temperature range result from larger ionic displacements and an enhanced asymmetric charge distribution, both of which are induced by BiYbO3 substitution. The present study presents a new example of an NTE across a broad temperature range, highlighting its potential as an effective thermal expansion compensator.}
}