钠钨青铜的制备与电子显微学表征

钠钨青铜的制备与电子显微学表征

韩  威¹，吕英豪¹，曹 凡¹，贾双凤¹，郑  赫¹，王建波^1，2*

（1. 武汉大学物理科学与技术学院，电子显微镜中心，人工微结构教育部重点实验室和高等研究院，湖北 武汉430072；2. 中南大学轻质高强结构材料重点实验室，湖南 长沙410083）

摘要  利用简单加热的方法合成了具有通道结构的钠钨青铜材料。通过X射线衍射学和电子显微学分析确定了三种产物分别是Na₂W₄O₁₃、Na₅W₁₄O₄₄和伪六角的Na_xWO_3+y。基于Na₅W₁₄O₄₄和Na_xWO_3+y之间的结构关系，Na_xWO_3+y首次被确定为具有三斜结构的相（晶胞参数:a_III = 0.7274 nm，b_III= 0.7291 nm，c_III= 11.031 nm，α_III= 90.71°，β_III= 90.69°，γ_III= 119.65°）。研究结果为钠离子电池中新型电极材料的制备提供参考。

关键词  钠钨青铜；钠离子电池；伪六角结构

中图分类号：TG115.21⁺5.3  文献标识码：Adoi:10.3969/j.issn.1000-6281.2017.03.004

Synthesis and electron microscopy characterization of sodium tungsten bronzes

HAN Wei¹，LÜ Ying-hao¹，CAO Fan¹，JIA Shuang-feng¹，ZHENG He¹，WANG Jian-bo^1，2*

(1. School of Physics and Technology, Center for Electron Microscopy, MOE Key Laboratory of Artificial Micro- and Nano-structures, and Institute for Advanced Studies, Wuhan University, Wuhan Hubei 430072, China; 2. Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha Hunan 410083, China)

Abstract  In this paper, sodium tungsten bronzes with channel structures were successfully synthesized by a simple heating method. The products were identified to be Na₂W₃O₁₄,Na₅W₁₄O₄₄ and pseudo-hexagonal Na_xWO_3+yby using the X-ray diffractometry, scanning and transmission electron microscopy.According to the structural relationship between Na₅W₁₄O₄₄ and Na_xWO_3+y, Na_xWO_3+y was never reported before and proved to be triclinic (cell parameters:a_III = 0.7274 nm, b_III = 0.7291 nm, c_III = 11.031 nm, α_III = 90.71°, β_III = 90.69°, γ_III = 119.65°),. Our results would serve as a possible guidance for the synthesis of novel electrode materials in sodium ion batteries.

Keywords   sodium tungsten bronze；sodium ion battery；pseudo-hexagonal structure

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