文献类型：期刊文献

英文题名：Study of the changes in the structure and optical properties of MgxCo1-xCr2-yAlyO4 spinel caused by A/B site ion substitution

作者：Yin, Xiangchun[1];Huang, Jianguo[1];Zhang, Wenjun[1];Xiong, Kaiwen[1];Xu, Zehao[1];Zhang, Yuantao[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2022

卷号：48

期号：22

起止页码：33524

外文期刊名：CERAMICS INTERNATIONAL

收录：;EI(收录号：20223312577687);WOS:【SCI-EXPANDED(收录号:WOS:000870822900002)】；

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; Oxygen vacancies

摘要：In this work, nanosubmicron blue-green pigment powder based on the composition of MgxCo1-xCr2-yAlyO4(0 = x < 1, 0 = y < 2)was prepared by a gel casting method. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Rietveld refinement with GSAS (General Structure Analysis System), and UV-Vis absorption spectroscopy were used to study the phase composition, grain size, morphology, cation distribution in the crystal structure and spectral absorption of the samples. Colour parameters were also studied by using a colour measurement spectrophotometer. The studies demonstrate that the distribution of cations in the crystal structure is disordered and that divalent and trivalent cations are mixed to occupy tetra-hedral and octahedral sites. Furthermore, the substitution of ions at the A/B site leads to a change in the cation distribution ratio at the tetrahedral and octahedral sites. With increasing Mg2+ doping concentration, the inversion parameter of the spinel increases, while with increasing Al3+ doping concentration, the inversion parameter of the spinel decreases. In addition, changes in the calcining atmosphere lead to a change in the oxygen vacancy content in the structure. Under the condition of a reductive atmosphere, the oxygen vacancy content significantly increases, and the inversion parameter also increases. The colour difference for the syn-thesized MgxCo1-xCr2-yAlyO4 spinel powder is related to the proportion of chromophore ions occupying tetra-hedral and octahedral sites and the number of oxygen vacancies.