Accurate identification of glass crystallization helps in selecting high electronic conductivity materials

IF 4.8 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Fanhou Kong , Shuli Li , Suoqi Zhao , Huiwen Li , Lin Li , Zhenting Zang , Rui Zhang , Hongrui Liu , Lehan Wang , Changjiu Li , Keng H. Chung
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Abstract

Though the current research on vanadium-based glass electrodes has made great progress, the conductivity theory of V-based glasses has not been obviously improved and crystals cannot be positioned precisely. The changes in the valence state of V3+, V4+ and V5+ are regulated by the strong reducing agent Fe2P to realize valence bond transformation of the amorphous electrode, explore the redox process of multi-electron reactions and further optimize the conductivity of electrode materials. VPFe2 and VPFe3 precipitate VO2 crystals and VPFe4 precipitates VO2 and V6O11 crystals. Electron back-scattered diffraction was used to accurately identify the distribution and specific positions of both types of crystals. V6O11 crystals exhibit a strong texture according to pole figure and inverse pole figure. XPS reveals that Fe2P and V2O5, undergo a redox reaction during the high-temperature melting process, where V5+ is reduced to V4+ and V3+ and V4+ renders a positive influence on conductivity. The addition of Fe2P increases the content of V4+ in the glass and VPFe3 glass contains the highest content of V4+, leading to the highest electronic conductivity. V2O5 transforms into VO2 crystals and VO2 transforms into V6O11 with the increase of Fe2P content. The type of nanocrystal precipitation in glass affects electronic conductivity.

Abstract Image

准确识别玻璃结晶有助于选择高电子传导性材料
虽然目前钒基玻璃电极的研究取得了很大进展,但钒基玻璃的电导理论还没有得到明显改善,晶体无法精确定位。通过强还原剂Fe2P调控V3+、V4+和V5+的价态变化,实现非晶电极的价键转变,探索多电子反应的氧化还原过程,进一步优化电极材料的导电性能。VPFe2 和 VPFe3 沉淀出 VO2 晶体,VPFe4 沉淀出 VO2 和 V6O11 晶体。电子反向散射衍射被用来准确识别这两种晶体的分布和具体位置。根据极点图和反极点图,V6O11 晶体显示出强烈的纹理。XPS 显示,Fe2P 和 V2O5 在高温熔化过程中发生了氧化还原反应,V5+ 被还原成 V4+ 和 V3+,V4+ 对导电性产生了积极影响。加入 Fe2P 会增加玻璃中 V4+ 的含量,VPFe3 玻璃中 V4+ 的含量最高,因此电子导电率也最高。随着 Fe2P 含量的增加,V2O5 转变为 VO2 晶体,VO2 转变为 V6O11。玻璃中纳米晶体析出的类型会影响电子导电性。
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来源期刊
CiteScore
8.60
自引率
2.10%
发文量
2812
审稿时长
49 days
期刊介绍: Progress in Natural Science: Materials International provides scientists and engineers throughout the world with a central vehicle for the exchange and dissemination of basic theoretical studies and applied research of advanced materials. The emphasis is placed on original research, both analytical and experimental, which is of permanent interest to engineers and scientists, covering all aspects of new materials and technologies, such as, energy and environmental materials; advanced structural materials; advanced transportation materials, functional and electronic materials; nano-scale and amorphous materials; health and biological materials; materials modeling and simulation; materials characterization; and so on. The latest research achievements and innovative papers in basic theoretical studies and applied research of material science will be carefully selected and promptly reported. Thus, the aim of this Journal is to serve the global materials science and technology community with the latest research findings. As a service to readers, an international bibliography of recent publications in advanced materials is published bimonthly.
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