@article{Yuan2025, 
author = {Xinglai Yuan and Qinghu Wang and Runke Wu and Shaobai Sang and Yibiao Xu and Xiong Liang and Liping Pan and Bingbing Fan and Yawei Li and Rui Zhang and Jiangtao Li and Olena Volkova},
title = {Environment-friendly Ca2+/Cr3+ co-doping LaAlO3 ceramics with excellent infrared radiation performance for energy-saving},
year = {2025},
journal = {Journal of Advanced Ceramics},
volume = {14},
number = {1},
pages = {9221017},
keywords = {environmentally friendly, energy-saving, Cr6+ suppression, LaAlO3, infrared (IR) radiation},
url = {https://www.sciopen.com/article/10.26599/JAC.2024.9221017},
doi = {10.26599/JAC.2024.9221017},
abstract = {Ca2+/Cr3+ co-doped LaAlO3 infrared (IR) ceramics have been proven to be potential energy-saving materials for high-temperature industries because of their high emissivity and high-temperature stability. However, Cr6+ formation commonly occurs in materials and poses environmental and health risks, such as Cr6+ dissolution in water and CrO3(g) volatilization. In this study, we combined high emissivity with in situ detoxification by introducing residual Al2O3 into Ca2+/Cr3+ co-doped LaAlO3 ceramics. Compared with the undoped ceramics, the addition of 20 wt% residual Al2O3 resulted in a 78.5% reduction to 18.44 mg/kg (lower than the EU standard of 20 mg/kg) in Cr6+ dissolution and a decrease in 77.8% CrO3(g) volatilization. This significant detoxification effect can be attributed to the formation of CaAl12−xCrxO19. Additionally, as the residual Al2O3 content increased from 5 to 20 wt%, the ceramics maintained high emissivity, above 0.896 in the near-infrared band and 0.781 in the mid-infrared band. Furthermore, the IR coating effectively increased the surface temperature (from 767.1 to 790.7 °C/min) and the heat radiation of the heating source, increasing the heating rate from 31.7 to 34.6 °C/min during water heating. This work offers a promising approach for designing environmentally friendly IR ceramics with excellent IR performance for energy-saving applications in the high-temperature industry.}
}