Electrochromic Property of Perovskite Ceramic Films

doi:10.15541/jim20210750

Abstract

Abstract:

Perovskite manganese oxide (PMO) has attracted extensive attention in the field of heat dissipation because of its discoloration stimulated by external conditions. At present, most of the researchs on the discoloration characteristics of PMO is based on temperature excitation, and there still lacks of heat dissipation equipment excited by electric field. In addition, because the electric field excitation is accompanied by Joule heat, electrochromic property of PMO materials has not been clearly proved. In view of the above challenges, here an electrical modification method for PMO materials is proposed by using influence of electric field excitation on Mn elements in PMO. Thermochromic property of PMO was greatly weakened by electrical modification, and then La_0.7Ca_0.25K_0.05MnO₃ (LCKMO) can eliminate the influence of Joule heat in electric field excitation experiment. We studied the thermochromic and electrochromic properties of LCKMO before and after electrical modification. Emittance of LCKMO before electrical modification increases with the increase of temperature with the maximum increment at 17%. After being excited by 21 V electric field, the emittance increases by 15%, 16%, 10%, 0.6% and 1.4% at 173, 203, 243, 273, and 373 K, respectively. The thermochromic property of electrically modified LCKMO is greatly weakened, and its emittance increases by 10.7% and 9.3% at 273 and 373 K, respectively, after being excited by 21 V electric field. The experimental results before and after electrical modification show that LCKMO has electrochromic property, and there is an obvious regulation mechanism of electric field excitation on the emissivity. Therefore the electrical modification method for PMO materials can not only enable the electrochromic study of PMO materials without the influence of Joule heat, but also provides a new possibility for regulation of the thermochromic property of PMO materials.

Key words: perovskite, thermal radiation, electrochromic, Joule heat

CLC Number:

TB321

HUANG Zhihang, TENG Guanhongwei, TIE Peng, FAN Desong. Electrochromic Property of Perovskite Ceramic Films[J]. Journal of Inorganic Materials, 2022, 37(6): 611-616.

Figures/Tables 6

Fig. 1 Macroscopic and microscopic characterization of perovskite ceramic films (La0.7Ca0.25K0.05MnO3, LCKMO) (a) Macroscopic photo of LCKMO film; (b) SEM image of LCKMO film surface; (c) EDS spectrum of LCKMO film; (d) XRD pattern of LCKMO film; (e) AFM image of LCKMO film

Fig. 2 Spectral infrared emissivity of LCKMO films excited by electric field at different temperatures

Fig. 3 Integral infrared emissivity of LCKMO films at different temperatures (a) Variation of integrated infrared emittance ∆Eh of the film excited by 21 V electric field; (b) Temperature dependent integrated infrared emittance Eh of the film before and after electrical modification

Fig. 4 Spectral infrared emissivity of electrically modified LCKMO films excited by electric field at different temperatures

Fig. 5 Schematic diagram of double exchange mechanism[23]

Fig. 6 Electrochromic mechanism of LCKMO films

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