Application, mechanism explanation, and performance comparison of Er(Ta1-xNbx)O4 (0≤x≤0.2) (IMAGE)

Tsinghua University Press

Application, mechanism explanation, and performance comparison of Er(Ta1-xNbx)O4 (0≤x≤0.2)

Caption

The as-prepared Er(Ta1-xNbx)O4 (0≤x≤0.2) ceramics exhibit high emissivity (49%-93%) in the selective band (1.40-1.60 μm), high spectral efficiency (59.46%-62.12%) and excellent high-temperature stability at 1400 ℃. On the one hand, doping Nb5+ into the B-site changes the crystal local structure symmetry around Er3+, which promotes the f-f transition of Er3+ and enhances the selective emission performance. On the other hand, doping Nb5+ ions into the B-site can alter the band gap and oxygen vacancy concentration to suppress non-selective emissivity. Increasing the selective emissivity and reducing the non-selective emissivity is beneficial for improving the spectral efficiency of selective emitters. Hence, the selective emissivity and spectral efficiency of Er(Ta1-xNbx)O4 (0≤x≤0.2) can be effectively enhanced through compositional design, providing a new strategy for developing selective emitter materials for RTPV applications.

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Journal of Advanced Ceramics, Tsinghua University Press

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