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Your search keyword '"Zhao, Liming"' showing total 14 results
Start Over Author "Zhao, Liming" Journal ceramics international
14 results on '"Zhao, Liming"'

7. Changing the Ca2+ ion ratio to modulate the temperature coefficient of resistivity (TCR) of La1-Ca MnO3 films prepared by the sol-gel spin coating method

Author

Chen, Zihao, primary, Han, Jiamei, additional, Gu, Xin, additional, Wu, Kaikai, additional, Jiang, Jiabin, additional, Zhao, Liming, additional, Yan, Yixin, additional, Wang, Haitao, additional, Liang, Xiaolu, additional, Wang, Yao, additional, Wang, Zhenyu, additional, Zhu, Xiaokun, additional, Pan, Zimeng, additional, and Liu, Xiang, additional

Published
2024
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13. Thermophysical properties of Ca3Ln3Ce7Ta2O26.5 (Ln=Gd and Yb) oxides for thermal barrier coating applications

Author

Yan Xianfeng, Zhao Liming, Lu Kui, Zhang Hongsong, Zhang Haoming, and Chen Xiaoge

Subjects
010302 applied physics, Materials science, Process Chemistry and Technology, Sintering, Thermodynamics, 02 engineering and technology, Crystal structure, 021001 nanoscience & nanotechnology, 01 natural sciences, Atomic mass, Thermal expansion, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Thermal barrier coating, visual_art, Lattice (order), 0103 physical sciences, Materials Chemistry, Ceramics and Composites, visual_art.visual_art_medium, Ceramic, 0210 nano-technology
Abstract

Ca3Ln3Ce7Ta2O26.5 (Ln = Gd or Yb) oxides were synthesised using a high-temperature sintering technology at 1873 K for 10 h in air. The crystal lattice structures and thermophysical properties of these two oxides were estimated. The fabricated ceramics present an onefold pyrochlore-kind lattice. Because of the relatively higher atomic weight of Ca3Yb3Ce7Ta2O26.5 than that of Ca3Gd3Ce7Ta2O26.5, the heat-insulation ability of Ca3Yb3Ce7Ta2O26.5 is less than that of Ca3Gd3Ce7Ta2O26.5. Due to the minor electro-negativity of Yb than that of Gd, Ca3Yb3Ce7Ta2O26.5 exhibits greater thermal expansion coefficient than Ca3Gd3Ce7Ta2O26.5.

Published
2020

14. Co-optimization of Na and K doping for improved room-temperature TCR of La0.7(Na0.3-xKx)MnO3 polycrystalline ceramics.

Author

Yan, Yixin, Jin, Shuaizhao, Yu, Xiaohan, Guan, Xiaoli, Wu, Kaikai, Zhao, Liming, Gu, Xin, and Liu, Xiang

Subjects
*TEMPERATURE coefficient of electric resistance, *X-ray powder diffraction, *CRYSTAL lattices, *SCANNING electron microscopy, *RAMAN spectroscopy
Abstract

Polycrystalline La 0.7 (Na 0.3- x K x)MnO 3 (LNKMO, x = 0.10, 0.15, 0.20, 0.25, and 0.26) ceramics were successfully compounded by adopting conventional sol-gel technology. The physical properties of as-prepared specimens were closely related to their morphology and internal structure, which were characterized and analyzed via X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FESEM), Fourier transform infrared (FTIR) spectroscopy, and Raman spectroscopy. Results confirmed that La+ ions located at A-sites in crystal lattice were partially substituted by doped Na+ and K+ ions, which resulted in rotation and distortion of MnO 6 octahedron. Lattice distortion was primary factor behind double exchange (DE) mechanism and Jahn-Teller (JT) effects. In addition, Na and K dopants altered relative amount of Mn3+ and Mn4+ ions, causing intensity variation in DE effect. These changes contributed to a decline in resistivity and an increase in peak resistance temperature (T k) with increasing K doping level. Meanwhile, optimal temperature coefficient of resistance (TCR) value of LNKMO ceramics reached 8.48% K−1 at 292.14 K when x = 0.25. This work reveals the mechanism of Na and K co-doping to optimize electrical transport properties of LNKMO manganese oxides and provides excellent material for the fabrication of uncooled infrared bolometers. [ABSTRACT FROM AUTHOR]

Published
2022
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