Defect engineering of Sr-doped Y2Ti2O7 nanostructure ceramics for superior microwave absorption via air sintering.
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| Title: | Defect engineering of Sr-doped Y2Ti2O7 nanostructure ceramics for superior microwave absorption via air sintering. |
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| Authors: | Han, Qi1 (AUTHOR), Han, Juncheng1 (AUTHOR), Li, Qingjie1 (AUTHOR), Gan, Fangyu1 (AUTHOR) gfy@guet.edu.cn, Yao, Qingrong1 (AUTHOR), Cheng, Lichun1 (AUTHOR), Wang, Jiang1 (AUTHOR) waj124@guet.edu.cn |
| Source: | Ceramics International. May2026:Part B, Vol. 52 Issue 13, p23471-23482. 12p. |
| Subjects: | Oxygen vacancy, Electromagnetic wave absorption, Dielectric loss, Ceramic materials, Radar cross sections, Sintering |
| Abstract: | Y 2 Ti 2 O 7 ceramic is considered a promising microwave absorbing material because of its pyrochlore structure and excellent chemical stability, but its practical application is restricted by low intrinsic dielectric loss and narrow absorption bandwidth. In this work, unlike the vacuum hot-pressing strategy, which may suppress conductivity, this work employed a facile sol-gel method followed by air sintering to fabricate nanostructured Y 2- x Sr x Ti 2 O 7 (x = 0, 0.05, 0.1, 0.15) ceramics. This process enabled effective regulation of the crystal structure and defect states. With increasing Sr doping, the concentration of oxygen-vacancy-related defects and the conductive behavior were effectively modulated. Y 1.9 Sr 0.1 Ti 2 O 7 (Sr10) ceramic exhibits a nanostructured network composed of short rod-like nanoparticles and achieves the best microwave absorption performance, delivering a minimum reflection loss of −51.11 dB and a maximum effective absorption bandwidth of 4.63 GHz. The superior performance originates from an optimized synergistic mechanism established by an appropriate concentration of oxygen-vacancy-related defects, in which hopping conduction serves as the dominant attenuation pathway, while defect-related and interfacial polarization relaxation play an auxiliary role in regulating the dielectric response and improving impedance matching. Therefore, the optimal performance of Sr10 sample arises from the synergistic balance between attenuation capability and impedance matching, rather than simply from an increase in defect concentration. Furthermore, radar cross-section (RCS) simulations demonstrate that Sr10 sample achieves an RCS reduction of over 33.6 dBsm compared with a perfect electric conductor. This work provides a useful reference for the performance optimization of pyrochlore-structured dielectric absorbing materials. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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