Synthesis and Near-Infrared Reflective Properties of Rare-Earth-Doped Bi2-xGdxMoO6

doi:10.7503/cjcu20250088

Chem. J. Chinese Universities

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Synthesis and Near-Infrared Reflective Properties of Rare-Earth-Doped Bi_2-xGd_xMoO₆

YAN Junlin¹, LI Xiaodong¹, LIU Dongyang², LI Mingzhe³, ZHANG Su⁴

1. School of Materials Science and Engineering, Jilin Jianzhu University
2. Geely Automobile Research Institute (Ningbo) Co., Ltd.
3. Geely Automobile (Ningbo Hangzhou Bay Branch) of Zhejiang Jirun Automobile Co., Ltd. 4. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences

Received:2025-03-31 Revised:2025-06-25 Online First:2025-06-30 Published:2025-06-30
Contact: ZHANG Su E-mail:zhangsu@ciac.ac.cn
Supported by:
Supported by the Jilin Province Science and Technology Development Plan Project(No. 20230101051JC)

Abstract

Abstract: In response to the escalating challenges of global climate change and urban heat island effects, the development of energy-efficient functional materials with high near-infrared (NIR) reflectance and effective thermal regulation capabilities has become a research focus. Traditional oxide materials, such as Bi2MoO6, still exhibit certain limitations in NIR reflectance. In recent years, rare-earth-modified molybdate materials have attracted significant attention in the field of NIR-reflective coatings due to their excellent optical response characteristics and structural stability. In this study, Gd3+-doped Bi2-xGdxMoO6(x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) NIR reflective materials were synthesized via a solid-state reaction method. The obtained samples were systematically characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), energy-dispersive spectroscopy(EDS), Fourier transform infrared spectroscopy(FTIR), Raman spectroscopy, near-infrared(NIR) reflectance spectroscopy, thermogravimetric-differential scanning calorimetry(TG-DSC), and thermal insulation performance tests. The results indicated that the synthesized samples exhibited good crystallinity. Gd3+ doping induced a bandgap narrowing (from 2.87 eV to 2.80 eV), leading to a redshift of the absorption edge and enhanced absorption in the 450~600 nm blue-green region, resulting in a more pronounced yellow hue and enabling effective color modulation. All Bi2-xGdxMoO6 samples exhibited high NIR reflectance, with values exceeding 87.68%, significantly higher than that of TiO2(75.66%). In particular, the sample with x = 0.4 demonstrated the highest NIR reflectance of 90.11% and a NIR solar reflectance of 89.53%, which are 14.45% and 9.24% higher than those of TiO2, respectively. Infrared lamp irradiation experiments further confirmed the superior energy-saving and thermal insulation performance of the materials. TG-DSC analysis revealed that Bi2-xGdxMoO6 pigments possess excellent thermal stability, allowing for long-term application in high-temperature environments. These findings offer a new and promising alternative for high-performance thermal insulation materials.

Key words: Rare earths, Bi2MoO6; Near-infrared reflectance properties, Gd3+

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YAN Junlin, LI Xiaodong, LIU Dongyang, LI Mingzhe, ZHANG Su. Synthesis and Near-Infrared Reflective Properties of Rare-Earth-Doped Bi_2-xGd_xMoO₆[J]. Chem. J. Chinese Universities, doi: 10.7503/cjcu20250088.

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Synthesis and Near-Infrared Reflective Properties of Rare-Earth-Doped Bi_2-xGd_xMoO₆

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