Lithium zinc silicate (Li2O–ZnO–SiO2) microcrystalline glass is a promising energy-saving material for building applications, yet its thermal radiation behavior under dynamic heating conditions – critical for real-world performance – has not been systematically addressed. This study, for the first time, investigates the dynamic thermal radiation characteristics of Li2O–ZnO–SiO2 glass-ceramics during continuous heating from room temperature to 800°C, directly correlating real-time spectral emissivity with in-situ crystallization processes. By integrating high-temperature X-ray diffraction (HT-XRD) and emissivity measurements, we reveal that the onset of crystallization (notably Li2Si2O5 and Zn2SiO4 phases) triggers a pronounced, non-linear increase in total hemispherical emissivity – from ~0.25 in the glassy state to over 0.70 in the fully crystallized state. This work establishes a novel link between microstructural evolution and dynamic radiative properties, providing essential insights for the rational design of smart glazing and passive radiative cooling materials for sustainable construction.
Wenxiang Pei (Mon,) studied this question.