Citation: Zhu Bo, Chen Min, Yuan Xian-Xin, Jin Song-Shou, Lv Guang-Lie, Wu Hong-Li. Effect of K+、Al3+on the Structure of Zn-Co-O System bu the Rietveld Structure Refinement[J]. Acta Physico-Chimica Sinica, 1995, 11(02): 135-141. doi: 10.3866/PKU.WHXB19950208
Rietveld法研究K+,Al3+对Zn-Co-O体系结构的影响
为了研究K＋、Al3＋对Zn－Co－O尖晶石催化性能的影响，用Rietveld分析法测定了由共沉淀法制备的Zn－Co－O体系的结构，并考察添加K＋、Al3＋对该体系结构的影响．结果表明，该体系均由（CoZn）O固溶体ZnCo2O4尖晶石二相以及部分非晶态组成，添加K＋、Al3＋能使尖晶石相含量增加，对氧参数的影响呈相反趋势，氧参数大小规律与氧的活动性大小相对应．
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关键词:
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Rietveld结构修正
- / 尖晶石结构
- / 氧活动性
English
Effect of K+、Al3+on the Structure of Zn-Co-O System bu the Rietveld Structure Refinement
The effect of addition of K+ 、Al3+ on the structure of Zn-Co-O system was investigated by means of the Rietveld structure refinement. The results of Rietveld analysis show that there is a spinel phase (AB2O4) and a solid solution phase [(CoxZn1-x)O] in samples Ⅰ, Ⅱ and Ⅲ. The addition of K+ and Al3+ enhance the spinel phase content, while produce opposite effect on the bond valence of cations, the oxygen parameter, and the bond distance of the tetrahedra and the octahedra. The effect of addition of K+ and Al3+ on the oxygen parameters may be closely related to the oxygenous activities. According to the bond valence theory and the trend of the occupying site A or B by the cations and the Crystal Field Theory, it is supposed the spinel [ZnmCo(1-m)2+]Co23+O4 was produced in sample Ⅰand Ⅱ, and the spinel [ZnmCo(1-m)2+] [Con3+Al(1-n)]2O4 was formed in sample Ⅲ.
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Key words:
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Rietveld structure refinement
- / Structure of spinel
- / Oxygenous activity
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