TY - JOUR

T1 - Second-phase composite engineering endows Gd3TaO7-based ceramic with broadband infrared radiation

AU - Xie, Enyu

AU - Wang, Shuqi

AU - Chen, Guoliang

AU - Zou, Yongchun

AU - Zhang, Jianghong

AU - Wang, Yaming

AU - Zhao, Qingyuan

AU - Peng, Zijian

AU - Yao, Junteng

AU - Quyang, Jiahu

AU - Jia, Dechang

AU - Zhou, Yu

AU - Столярова, Валентина Леонидовна

PY - 2025/10/1

Y1 - 2025/10/1

N2 - High-temperature infrared (IR) radiation materials with broadband high emissivity, low thermal conductivity, and high fracture toughness are urgently needed for radiative heat management. Here, we report a Gd3TaO7/GdFeO3 composite ceramic that integrates a broadband (0.78–14 ​μm) high emissivity (close to 0.9), low thermal conductivity (1.62 ​W ​m−1 ​K−1), and fracture toughness (2.3 ​MPa ​m1/2, close to YSZ). Through the introduction of second-phase GdFeO3, many lattice distortions, multimode vibrations, and additional oxygen vacancies (Ov) contribute to an increase in the broad-band emissivity of the composite ceramics (especially in the 2.5–6 ​μm band, nearly 5 times greater than that of Gd3TaO7). This high IR emissivity significantly suppresses the elevated photonic thermal conductivity at high temperatures, resulting in ultralow thermal conductivity. Moreover, the stable atomic arrangement within the two phases contributed to the impressive high-temperature stability (1773 ​K, 200 ​h). The improved fracture toughness is attributed primarily to the presence of the second phase promoting crack tip deflection, bridging and branching, which prevent crack expansion. All the advantages render this second-phase composite strategy fully competitive in the development of a new generation of superhigh-temperature radiative heat management materials.

AB - High-temperature infrared (IR) radiation materials with broadband high emissivity, low thermal conductivity, and high fracture toughness are urgently needed for radiative heat management. Here, we report a Gd3TaO7/GdFeO3 composite ceramic that integrates a broadband (0.78–14 ​μm) high emissivity (close to 0.9), low thermal conductivity (1.62 ​W ​m−1 ​K−1), and fracture toughness (2.3 ​MPa ​m1/2, close to YSZ). Through the introduction of second-phase GdFeO3, many lattice distortions, multimode vibrations, and additional oxygen vacancies (Ov) contribute to an increase in the broad-band emissivity of the composite ceramics (especially in the 2.5–6 ​μm band, nearly 5 times greater than that of Gd3TaO7). This high IR emissivity significantly suppresses the elevated photonic thermal conductivity at high temperatures, resulting in ultralow thermal conductivity. Moreover, the stable atomic arrangement within the two phases contributed to the impressive high-temperature stability (1773 ​K, 200 ​h). The improved fracture toughness is attributed primarily to the presence of the second phase promoting crack tip deflection, bridging and branching, which prevent crack expansion. All the advantages render this second-phase composite strategy fully competitive in the development of a new generation of superhigh-temperature radiative heat management materials.

KW - Tantalate-based-ceramics

KW - Thermal conductivity

KW - Thermal stability

KW - Toughness

KW - Tthermal radiation

UR - https://www.mendeley.com/catalogue/c1d8fa7f-26cc-3fa6-b123-12585a851b62/

U2 - 10.1016/j.apmate.2025.100318

DO - 10.1016/j.apmate.2025.100318

M3 - Article

VL - 4

JO - Advanced Powder Materials

JF - Advanced Powder Materials

SN - 2772-834X

IS - 5

M1 - 100318

ER -