文献类型：期刊文献

英文题名：Effect of the calcination temperature on the cation distribution and optical properties of Mg0.5Co0.5CrAlO4 spinel pigment

作者：Yin, Xiangchun[1];Huang, Jianguo[1];Pu, Zidie[1];Li, Jinfeng[1];Feng, Hao[1];Wang, Xiaoyang[1];Wang, Yiqun[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, 130 Meilong Rd, Shanghai, Peoples R China

年份：2021

卷号：47

期号：12

起止页码：17167

外文期刊名：CERAMICS INTERNATIONAL

收录：;EI(收录号：20211410159334);WOS:【SCI-EXPANDED(收录号:WOS:000648872400005)】；

基金：This work was supported by the Project of the National Natural Science Foundation of China (contract grant number 51872093) .

语种：英文

外文关键词：Spinel pigment; Cation distribution; Rietveld refinement; XPS peak Fitting

摘要：In this study, a blue-green pigment has been prepared by partially replace Co2+ and Cr3+ in CoCr2O4 spinel structure with Mg2+ and Al3+ using a gel casting method The gel precursor was calcined at various temperatures (900-1400 degrees C) to obtain Mg0.5Co0.5CrAlO4 spinel pigment. Combining the Rietveld refinement method of XRD and peak fitting of XPS high-resolution spectra, the relationships between the cation distributions (Co2+, Mg2+, Al3+, and Cr3+) in the tetrahedron and octahedron of the spinel structure and the calcination temperature were examined. In the octahedron, the contents of Co2+ and Al3+ decreased with increasing calcination temperature, and the Mg2+ and Cr3+ contents exhibited the opposite trend. The bond lengths of A-O and B-O change with increasing calcination temperature, thereby leading to a change in the unit cell. The optical performance of the pigments was investigated via UV-vis and CIE L*a*b* spectrophotometry, and the study shows that the blue-green hue of the pigment powder is caused by the absorption at upsilon 3 similar to upsilon 8 (370 nm-640 nm) in the visible light region. The varied contents of Co2+ and Cr3+ in the spinel structure among calcination temperatures cause the absorption spectrum intensity change, thereby resulting in various blue-green tones. This study lays the foundations for subsequent investigations of colour modification in MgxCo1-xAlyCr2-yO4 spinel.