Amalgams of less noble metals as model systems for polar intermetallic phases

低贵金属的汞齐作为极性金属间相的模型系统

• 批准号: 429690805
• 负责人: Privatdozent Dr. Constantin Hoch
• 金额: --
• 依托单位: Department Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/429690805?language=en
• 关键词: Amalgams; less; noble; metals; model

Polar intermetallic phases are metallic compounds in which electric, magnetic or Coulombic dipoles from electronegativity differences are in interplay with the conduction electrons. They are the topic of intensive studies because this interplay leads to combinations of at the first glance irreconcilable properties, such as e.g. ferroelectricity and metallic conductivity in one material. The impact of polar intermetallic phases is porven by the increasing number of studies and first applications, e.g. in modern data storage devices. The underlying principles necessary for a targetted creation of new properties and new property combinations still aren't understood. Studying appropriate model systems may help a lot in systematically revealing the relevant structure property relations in polar intermetallic phases. Amalgams of the less noble metals have proven suitable as model systems over the last years, especially the mercury-richest members of this class of intermetallic compounds.The number of well-studied compunds in this fied still is too small as to give a clear picture over the general trends and rules. This project therefore deals with synthesis and structural and physical characterisation of new amalgams of less noble metals. New binaries, such as beryllium amalgams, as well as ternary amalgams with two different less noble metals shall be targetted in the first systematic study on Hg-rich amalgams. Chemical synthesis of gam-scaled samples and of single crystals for structural elucidation are the base for comprehensive characterisations by measurement of electric conductivity, susceptibility, as well as thermoanalytical and thermoelectrical behaviour. They will be combined with quantum-chemical calculations of the electronic structure and with NMR-spectroscopic determination of the Knight shift. This project is meant to increase knowledge on the interplay of conduction electrons with internal dipole moments in a metallic compound, in order to enable purposeful synthesis of polar intermetallic phases with combinations of properties suitable for application in new electronic materials and devices. Our group and our coworkers have shown with a number of preliminary studies on this topic to be capable of auspiciously conducting this project.

金属间相是金属化合物，其中电负性差异的电，磁性或库仑偶极子与传导电子的相互作用。它们是密集研究的主题，因为这种相互作用导致乍一看不可调和的特性的组合，例如一种材料中的铁电性和金属电导率。极性金属间相的影响是通过越来越多的研究和首次应用，例如在现代数据存储设备中。尚未了解针对新属性和新属性组合所必需的基本原则。研究适当的模型系统可能会在系统地揭示极地金属间阶段中相关的结构属性关系方面有很大帮助。在过去的几年中，较不贵金属的汞齐被证明是模型系统，尤其是这类金属间化合物的汞最丰富的成员。此类融合的良好申请的数量仍然太小，以至于对一般趋势和规则提供了清晰的了解。因此，该项目涉及较少贵族金属的新汞合金的合成，结构和物理表征。新的二进制文件，例如铍汞合金，以及具有两种不同贵族金属的三元汞齐，应在首次对富含HG的汞合子的系统研究中针对。通过测量电导率，易感性以及热分析和热电话行为，对GAM量表样品和单晶进行结构阐明的化学合成是综合特征的基础。它们将与电子结构的量子化学计算以及NMR-SpectRoscotic确定骑士移位结合使用。该项目旨在增加对金属化合物中传导电子与内部偶极矩相互作用的知识，以实现有目的的金属间阶段，具有适合在新电子材料和设备中应用的特性组合。我们的小组和我们的同事向许多有关此主题的初步研究表明，能够吉祥地进行该项目。