Application, mechanism explanation, and performance comparison of Mg2Al4Si5O18: xY3+ (IMAGE)
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A series of Mg2Al4Si5O18: xY3+ (x = 0%-10%) ceramic materials with superior passive radiative cooling (PRC) performance were designed and synthesized. Density functional theory (DFT) calculations reveal that Y3+ doping effectively suppresses phonon-polariton resonance and widens the bandgap, synergistically enhancing PRC performance. The prepared samples exhibit high atmospheric transparency window (ATW) emissivity (94.39%-98.39%) across the 0.4-2.5 μm solar spectrum and high solar reflectivity (89.52%-94.77%). Functioning as the “cooling glass” coating, the optimized material achieves the maximum temperature reduction of 16.5 °C and the average net radiative cooling power of 113.1 W·m-2. Mechanistically, Y3+ doping enhances ATW emissivity by inducing lattice distortion, reducing structural symmetry, and modifying dipole moments, while simultaneously maintaining the wide bandgap via optically inert doping to ensure high visible and near-infrared reflectivity. Combining high performance, cost-effectiveness, and environmental friendliness, this work presents a highly promising ceramic solution for large-scale radiative cooling applications.
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Journal of Advanced Ceramics, Tsinghua University Press
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