Specific features of spectral and electrical properties of double-perovskite LnBaCo₂O_5+δ (Ln=lanthanides) under solar irradiation

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• 作者：Yi Lu^a ; ^b ; ^c ; Rong Zhang^a ; ^b ; ^c ; Ling Wei^a ; ^b ; ^c ; Chunhua Lu^a ; ^b ; ^c ; ^{chhlu@njtech.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yaru Ni^a ; ^b ; ^c ; ^d ; Zhongzi Xu^a ; ^b ; ^c ; ^{zzxu@njtech.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：B. X-ray methods ; C. Electrical conductivity ; C. Thermal properties ; D. Perovskites
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1186-1192
• 全文大小：1738 K

文摘

Cobalt-based perovskite oxides, LnBaCo₂O_5+δ (Ln=La to Lu), were investigated as potential variable electrical and thermal radiative materials under solar irradiation. The particular Ln³⁺ dopant has a significant effect on the oxide's phase structure, spectral reflectivity, electrical conductivity, and thermal radiative properties. Stable, cation-ordered oxides with layered lattice structures were obtained with medium-size Ln³⁺ ions. The general features of the electrical and spectral reflective properties of LnBaCo₂O_5+δ (Ln=La, Nd, Sm to Ho) are discussed. It is shown that LnBaCo₂O_5+δ (Ln=Sm to Ho) has a significant insulator–metal transition under solar irradiation, whereas LnBaCo₂O_5+δ (Ln=La, Nd) has a lower infrared emissivity at high temperatures due to the metal-like optical behavior.