@article{Wang2026, 
author = {Weichao Wang and Gu Liu and Liuying Wang and Jie Huang and Qiangqiang Wang and Qi Gu and Chaoqun Ge and Xiwei Yin and Shi Yan and Renbing Wu},
title = {Porous amorphous ceramics enable confined growth of high-entropy spinel for high-temperature electromagnetic wave attenuation},
year = {2026},
journal = {Nano Research},
volume = {19},
number = {8},
pages = {94908670},
keywords = {high-temperature, electromagnetic wave absorption, spinel, high-entropy},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94908670},
doi = {10.26599/NR.2026.94908670},
abstract = {Sustainable dielectric relaxation across a broad temperature window remains a significant challenge for high-temperature electromagnetic-wave (EMW) absorption, particularly in extreme conditions where dissipation pathways are severely constrained. Herein, a porous ceramic embedded with high-entropy nanocrystals (P-HEN) was developed by leveraging the confinement effect of the SiOCN covalent network. The confined growth and effective phase separation of (FeNiCoAl)3O4 nanocrystals generate thermally stable dielectric-relaxation activation units within the SiOCN matrix. Furthermore, the random distribution of multi-metal cations in the nanocrystals, together with the multi-interfacial interactions between the nanocrystals and the matrix, generates strong polarization responses. Consequently, P-HEN achieves sustained dielectric relaxation and full-band effective absorption in the X-band over a wide temperature range from 25 to 700 °C, while also exhibiting excellent thermal insulation and ablation resistance. This work demonstrates a confinement-enabled mechanism for stabilizing dielectric-relaxation loss at elevated temperatures, providing a new strategy for designing wide-temperature-window EMW absorbers.}
}