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Ca 2+ ‐Doped LaCrO 3 : A Novel Energy‐Saving Material with High Infrared Emissivity
Author(s) -
Han Zhao,
Liu Jun,
Li XiaoWei,
Chen YiXiang,
Liu GuangHua,
Li JiangTao
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13161
Subject(s) - emissivity , doping , impurity , infrared , analytical chemistry (journal) , ceramic , low emissivity , materials science , absorption (acoustics) , mineralogy , chemistry , optoelectronics , optics , physics , composite material , organic chemistry , chromatography
The present study describes the successful synthesis of a Ca 2+ ‐doped LaCrO 3 ceramic with high infrared ( IR ) emissivity, which is important for high‐temperature applications for significant energy saving. It is demonstrated that 20 mol% Ca 2+ ‐doped LaCrO 3 , i.e., La 0.8 Ca 0.2 CrO 3 , exhibited an IR emissivity as high as 0.95 in the spectral region of 3–5 μm, which was 33.8% higher than that of LaCrO 3 . By using La 0.8 Ca 0.2 CrO 3 as IR radiation agent in surface coating of heating unit, the radiative heat transfer could be enhanced significantly. The mechanism of the high IR emissivity of La 0.8 Ca 0.2 CrO 3 was attributed to the following aspects: Ca 2+ doping introduced an impurity energy level of Cr 4+ into LaCrO 3 and increased the hole carrier concentration, enhancing both impurity absorption and hole carrier absorption in the IR region; moreover, the doping caused lattice distortion enhanced the lattice vibration absorption. This novel high IR emissivity ceramic shows a promising future in high‐temperature applications for the purpose of energy‐saving.