Chemical Modification of High-Temperature Superconducting Iron Pnictides: New Chemical Compounds and Characterization

高温超导铁磷化物的化学改性：新化合物及其表征

• 批准号: 168575949
• 负责人: Professor Dr. Rainer Niewa
• 金额: --
• 依托单位: Institut für Anorganische Chemie (IAC)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/168575949?language=en
• 关键词: Chemical; Modification; Temperature; Superconducting; Iron

Newly discovered iron pnictide superconductor materials will be prepared in pure form and subsequently modified by selected chemical reactions. Those reactions involve ion exchange of alkali and alkaline-earth metal ions by different versatile metal ions, chemical (de)intercalation of alkali and alkaline-earth metal ions and oxidation of the starting compound leading to hole doping of the iron pnictide layer, oxide ion extraction via reduction of the starting compound resulting in electron doping of the iron pnictide layer as well as solvatization. All reactions serve the aim not only to change the electronic situation within the iron pnictide layers but to vary distance and/or relative orientation of those layers and chemical bonding situation to the interconnecting species. For crystal growth in later stage of the project we aim to conduct the reactions in a topochemical fashion. From the study of the resulting properties of the new compounds we expect fundamental insights in interdependencies of structure and properties.

新发现的铁磷属元素化物超导体材料将以纯的形式制备，随后通过选定的化学反应进行改性。这些反应涉及碱金属和碱土金属离子通过不同的通用金属离子的离子交换、碱金属和碱土金属离子的化学嵌入（脱嵌）和起始化合物的氧化导致铁磷属化物层的空穴掺杂、经由起始化合物的还原导致铁磷属化物层的电子掺杂的氧化物离子提取以及溶剂化。所有反应的目的不仅在于改变磷属元素化铁层内的电子情况，而且在于改变这些层的距离和/或相对取向以及与互连物质的化学键合情况。对于项目后期的晶体生长，我们的目标是以局部化学的方式进行反应。从新化合物的性质研究中，我们期望对结构和性质的相互依赖性有基本的了解。