B位Cr3+-Fe3+共掺杂铝酸镧的红外辐射性能

doi:10.3969/j.issn.1001-1935.2021.02.002

耐火材料 ›› 2021, Vol. 55 ›› Issue (2): 98-101.DOI: 10.3969/j.issn.1001-1935.2021.02.002

B位Cr³⁺-Fe³⁺共掺杂铝酸镧的红外辐射性能

王曲(), 张一帆, 王刚(), 张伟

中钢集团洛阳耐火材料研究院有限公司先进耐火材料国家重点实验室河南洛阳 471039

收稿日期:2020-07-31 出版日期:2021-04-15 发布日期:2021-04-15
作者简介:王曲:男,1994年生,硕士研究生。E-mail:lirrwq@163.com
基金资助:
NSFC-河南联合基金资助项目(U1904217)

Infrared radiation properties of lanthanum aluminate Co-doped with Cr³⁺-Fe³⁺ in B sites

Wang Qu(), Zhang Yifan, Wang Gang(), Zhang Wei

State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,Henan,China

Received:2020-07-31 Online:2021-04-15 Published:2021-04-15

摘要/Abstract

摘要：

以La₂O₃粉、Al₂O₃粉、Cr₂O₃粉、Fe₂O₃粉为原料,按照LaAl_1-_x_-_yCr_xFe_yO₃(x=y=0,0.1,0.2,0.25)的化学计量比配料,依次经球磨、烘干、在1 200 ℃预烧、再球磨、成型、1 600 ℃保温2 h烧结后,制备了Cr³⁺-Fe³⁺共掺杂铝酸镧材料,然后利用XRD、XPS、IR等手段进行分析表征。结果表明:掺杂后产物均为钙钛矿结构化合物。Cr³⁺-Fe³⁺共掺杂试样在近红外波段的辐射性较未掺杂的LaAlO₃大幅提高,试样LaAl_0.5Cr_0.25Fe_0.25O₃在0.76~2.5 μm波段的红外发射率从0.236提高到0.83。红外发射率提高的机制在于:Cr ³⁺-Fe³⁺共掺杂后形成了跃迁激活能仅为0.1 eV的Fe³⁺$\leftrightarrow$Fe⁴⁺小极化子,并且带隙中引入了对应于Cr⁵⁺和Cr⁶⁺的杂质能级,增强了杂质吸收和自由载流子吸收,从而提高了材料在近红外的发射率。

关键词: 铝酸镧, 红外发射率, B位掺杂, 陶瓷材料

Abstract:

Cr³⁺-Fe³⁺ co-doped lanthanum aluminate was prepared using La₂O₃ powder,Al₂O₃ powder,Cr₂O₃ powder,and Fe₂O₃ powder as raw materials.The ingredients were blended stoichiometrically according to LaAl_1-_x-yCr_xFe_yO₃(x=y=0,0.1,0.2,0.25),ball milled,dried,prefired at 1 200 ℃,ball milled again,molded and sintered at 1 600 ℃ for 2 h.The doped LaAlO₃ was characterized by XRD,XPS and IR.The results show that all the doped products are perovskite structural compounds.The near-infrared radiation performance of the Cr³⁺-Fe³⁺ co-doped samples is greatly improved compared with the undoped ones.The infrared emissivity of the sample LaAl_0.5Cr_0.25Fe_0.25O₃ in the 0.76-2.5 μm waveband increases from 0.236 to 0.83.The increasing mechanism of the infrared emissivity is considered as follows.After co-doping,Cr ³⁺-Fe³⁺ forms Fe³⁺$\leftrightarrow$Fe⁴⁺ small polaron with a transition activation energy of only 0.1 eV,introducing the impurity energy levels corresponding to Cr⁵⁺ and Cr⁶⁺.Thus the impurity absorption and free carriers absorption are enhanced,improving the emissivity in the near-infrared waveband of the material.

Key words: lanthanum aluminate, infrared emissivity, B site doping, ceramic material

中图分类号:

TQ174

王曲, 张一帆, 王刚, 张伟. B位Cr³⁺-Fe³⁺共掺杂铝酸镧的红外辐射性能[J]. 耐火材料, 2021, 55(2): 98-101.

Wang Qu, Zhang Yifan, Wang Gang, Zhang Wei. Infrared radiation properties of lanthanum aluminate Co-doped with Cr³⁺-Fe³⁺ in B sites[J]. Refractories, 2021, 55(2): 98-101.

图/表 7

图1 试样的XRD图谱

Fig.1 XRD patterns of sample

图2 试样LaAl0.5Cr0.25Fe0.25O3中Cr2p的XPS图谱

Fig.2 XPS spectra of Cr2p in LaAl0.5Cr0.25Fe0.25O3 sample

图3 试样LaAl0.5Cr0.25Fe0.25O3中Fe2p的XPS图谱

Fig.3 XPS spectra of Fe2p in LaAl0.5Cr0.25Fe0.25O3 sample

图4 试样LaAl0.5Cr0.25Fe0.25O3中O1s的XPS图谱

Fig.4 XPS spectra of O1s in LaAl0.5Cr0.25Fe0.25O3 sample

图5 试样的红外吸收率

Fig.5 Infrared absorptivity of samples

图6 试样LaAlO3和LaAl0.5Cr0.25Fe0.25O3的紫外-可见吸收曲线

Fig.6 Ultraviolet-visible absorption curve of LaAlO3 and LaAl0.5Cr0.25Fe0.25O3 sample

图7 图6中(αhν)2与hν关系曲线

Fig.7 (αhν)2 as a function of hν in Fig.6

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B位Cr³⁺-Fe³⁺共掺杂铝酸镧的红外辐射性能

Infrared radiation properties of lanthanum aluminate Co-doped with Cr³⁺-Fe³⁺ in B sites

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