Subsolidus phase relations of Li2O–FeO–P2O5 system and the solidsolubility of Li1+xFe1-xPO4 compounds under Ar/H2 atmosphere
Subsolidus phase relations of Li2O–FeO–P2O5 system and the solidsolubility of Li1+xFe1-xPO4 compounds under Ar/H2 atmosphere
复制标题
Ar/H2气氛下Li2O—FeO—P2O5体系的亚固相线相关系及Li1xFe1-xPO4化合物的固溶度
DOI：
10.1007/s10853-014-8579-3
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发表时间：
2015
影响因子：
4.5
通讯作者：
Quan Kuang
中科院分区：
文献类型：
--
作者：
Xinghao Lin;Yanming Zhao;Youzhong Dong;Zhiyong Liang;Danlin Yan;Xudong Liu;Quan Kuang
用X射线衍射仪系统地研究了Li2O-FeO-P2O5三元系在95%Ar+5%H_2气氛下的相关系，发现存在8个二元化合物、4个三元化合物、2个两相区和17个三相区。Li_2O-FeO-P_2O_5三元系在95%Ar+0.5%H_2气氛下不存在其他新的磷酸亚铁锂盐。在该体系中，确定了Li_(1+x)Fe_(1-x)−_xPO_4固溶体相，其均一范围为−_(0.15)≤_x_≤_(0.06)。结果表明，晶格参数(a，b，c，V)随过量Li离子(x>；0)的增加或过量Fe-离子(x<；0)的增加而线性变化。本文所确定的相图可以提供更多关于Li2O-FeO-P2O5三元体系相关系的信息，对今后该体系中磷酸铁锂的研究具有指导意义。
The phase relation of Li2O–FeO–P2O5ternary system under the 95 %Ar + 5 %H2atmosphere has been systematically investigated by X-ray diffraction (XRD), and there exist 8 binary compounds, 4 ternary compounds, 2 two-phase regions, and 17 three-phase regions. No other new lithium ferrous phosphates can be existed in the Li2O–FeO–P2O5ternary system under the 95 %Ar + 5 %H2atmosphere. In this system, the Li1+xFe1−xPO4solid solution phase with the homogeneous range of −0.15 ≤x≤ 0.06 is determined. Their corresponding lattice parameters are obtained by the refinement results, and the results show that the lattice parameters (a,b,c,V) vary linearly with the increasing amount of excess Li-ion (x> 0) or with the increasing amount of excess Fe-ion (x< 0). The phase diagram determined in this paper can provide more information about the phase relation of Li2O–FeO–P2O5ternary system and serve as a guide for the future investigation of lithium iron phosphates in this system.