An ultrahigh-frequencey and high-field complex impedance spectrometer for the studies of nanopolar and amorphous dielectric materials

用于研究纳米极性和非晶介电材料的超高频高场复阻抗谱仪

• 批准号: 345643-2007
• 负责人: Ye, ZuoGuang
• 金额: $ 10.93万
• 依托单位: Simon Fraser University
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=325914
• 关键词: ultrahigh; frequencey; field; complex; impedance

The development of today's society is based to a large extent on the use of inorganic functional materials that exhibit outstanding electric, magnetic, optical and other properties. Ferroelectric materials constitute an important class of functional materials. They are being used in the semiconductor industries as highly integrated capacitance and non-volatile dynamic random access memories. They are also being explored as the so-call 'smart' materials capable of sensing and responding to the environment changes (actuating) through an electro-mechanical tranduction process, for instance to effectively control the vibrations of cars or the noises of helicopters. These applications benefit from the outstanding crystal physical properties of the ferroelectric materials, which are characterized by an extremely high dielectric constant and an electrically switchable spontaneous polarization (dipolar moments). Therefore, the structure-property relations are central to an appreciation of ferroelectric materials, which have not been understood thoroughly. The complex dielectric spectrometer requested in this proposal will provide a powerful tool for such purpose. This research program is proposed to systematically study the dielectric properties of a large class of ferroelectric and related materials by means of the Dielectric and Impedance Spectroscopy. The complex dielectric response of the materials to an external AC exciting field will be measured and analyzed in a wide range of frequency up to radio frequecy range, temperature and high electric field. The investigations under such unique conditions will allow us to provide a better understanding of the nature and dynamics of dipolar relaxation, the structural phase transitions and the macroscopic properties. The establishment of the micro-structure and macro-property relations will in turn guide the design and synthesis of new ferroelectric and related materials with more enhanced properties for advanced applications. It is therefore of both fundamental relevance and practical importance. And the equipment requested is indispensable for the implementation of this research program.

当今社会的发展在很大程度上是基于无机功能材料的使用，这些材料具有优异的电、磁、光等性能。铁电材料是一类重要的功能材料。它们在半导体工业中用作高度集成的电容和非易失性动态随机存取存储器。它们还被认为是所谓的“智能”材料，能够通过机电转换过程感知和响应环境变化(驱动)，例如有效地控制汽车的振动或直升机的噪音。这些应用得益于铁电材料突出的晶体物理性质，其特征是极高的介电常数和电可切换的自发极化(偶极矩)。因此，结构-性质关系是欣赏铁电材料的核心，而铁电材料还没有被彻底理解。本提案中要求的复杂介电光谱仪将为实现这一目的提供一个强有力的工具。本研究的目的是利用介电和阻抗谱的方法，系统地研究铁电材料及相关材料的介电性能。测量和分析材料对外部交流激励电场的复杂介电响应，其频率范围可达射频范围、温度和强电场。在这种特殊条件下的研究将使我们更好地理解偶极弛豫的性质和动力学、结构相变和宏观性质。微观结构和宏观性质关系的建立将反过来指导新铁电材料和相关材料的设计和合成，这些材料具有更高的性能，用于高级应用。因此，它既具有根本的相关性，又具有实际重要性。而所要求的设备对于实施这项研究计划是不可或缺的。