Synthesis and Mechanistic Studies of New Series of Ferroelastic and Ferroelectric Crystals

新型铁弹铁电晶体系列的合成及机理研究

基本信息

  • 批准号:
    0809845
  • 负责人:
  • 金额:
    $ 39万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2008
  • 资助国家:
    美国
  • 起止时间:
    2008-07-01 至 2011-06-30
  • 项目状态:
    已结题

项目摘要

One of the principal goals of modern crystal engineering is the design, synthesis and optimization of new materials with specified function. This research program focuses on the technologically useful properties of ferroelastic and ferroelectric domain switching, in which theorientations of domains or regions within a crystal can be changed by application of anisotropic stress (ferroelasticity) or electric fields (ferroelectricity). The rational design of such materials (which can act as light gates or memory devices) requires a deeper understanding of the mechanisms of domain switching, a visible, macroscopic phenomenon that is controlled at the molecular, nanoscopic and mesoscopic scales. Building upon earlier work on the molecular determinants of ferroelasticity, this work will focus on mechanistic studies of domain switching in series of ferroelastic andferroelectric crystals in which the cooperative, elastic barriers to domain switching and ferroelectric ordering can be optimized and tailored. Because such a large number of closely related structures can be generated and compared, it concentrates on the design, synthesis and mechanistic studies ofseries of inclusion compounds, co-crystals and organic salts that exhibit ferroelastic and/or ferroelectric domain switching.Because of the insights they can provide about the barriers to domain switching, this work will utilize a variety of techniques (e.g., X-ray diffraction, synchrotron white beam X-ray topography, solid state nuclear magnetic resonance, ultrafast videomicroscopy, birefringence mapping) to probethe phenomenon of "memory effects" or "rubber-like behavior," in which the daughter domain that is generated by stress (or electric field) spontaneously reverts back to the parent orientation. A more thorough understanding of such memory effects will facilitate a targeted and iterative approach toforming series of ferroelectric crystals with well-defined properties.Broader Impacts: Because they will be required to integrate results from various methods and to utilize these results in the design of new materials, this research program will provide a broad-based training for undergraduate, graduate and postdoctoral students who will pursue careers in materialschemistry. By integrating numerous experimental results on a series of closely related structures,it should be possible to develop a more fundamental understanding of the factors controlling domain switching and memory effects in a variety of ferroelectric materials. This work will be disseminatedwidely in papers and presentations and utilized in graduate-level courses and undergraduate laboratories.
现代晶体工程的主要目标之一是设计、合成和优化具有特定功能的新材料。本研究计划的重点是铁弹性和铁电畴切换的技术上有用的特性,其中晶体内的畴或区域的方向可以通过应用各向异性应力(铁弹性)或电场(铁电性)来改变。这种材料(可以作为光门或存储器件)的合理设计需要对畴切换机制有更深入的了解,这是一种在分子、纳米和介观尺度上控制的可见宏观现象。在先前对铁弹性分子决定因素的研究基础上,本研究将重点研究一系列铁弹性和铁电晶体的畴切换机制,在这些晶体中,畴切换和铁电有序的协同弹性障碍可以被优化和定制。由于可以生成和比较大量密切相关的结构,因此它集中于设计,合成和机制研究一系列具有铁弹性和/或铁电畴切换的包合化合物,共晶和有机盐。由于他们可以提供关于畴转换障碍的见解,这项工作将利用各种技术(例如,x射线衍射,同步加速器白束x射线形貌,固态核磁共振,超快视频显微镜,双折射映射)来探测“记忆效应”或“橡胶样行为”现象,其中由应力(或电场)产生的子畴自发地恢复到母畴方向。更彻底地了解这种记忆效应将有助于有针对性和迭代的方法来形成一系列具有明确性质的铁电晶体。更广泛的影响:因为他们需要整合各种方法的结果,并在新材料的设计中利用这些结果,这个研究项目将为本科生、研究生和博士后提供广泛的培训,他们将从事材料化学的职业。通过整合一系列密切相关结构的大量实验结果,应该有可能对各种铁电材料中控制畴开关和记忆效应的因素有更基本的了解。这项工作将在论文和报告中广泛传播,并在研究生水平的课程和本科实验室中使用。

项目成果

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Mark Hollingsworth其他文献

Mark Hollingsworth的其他文献

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{{ truncateString('Mark Hollingsworth', 18)}}的其他基金

Acquisition of a Scanning Probe Microscope for Materials Research and Education
购买扫描探针显微镜用于材料研究和教育
  • 批准号:
    0076169
  • 财政年份:
    2000
  • 资助金额:
    $ 39万
  • 项目类别:
    Standard Grant
Energetic and Structural Studies of Functional Group Pairs for Materials Research
用于材料研究的官能团对的能量和结构研究
  • 批准号:
    0096157
  • 财政年份:
    1999
  • 资助金额:
    $ 39万
  • 项目类别:
    Continuing Grant
Cooperative Phenomena and Domain Switching Processes in Organic Inclusion Compounds
有机包合物中的协同现象和结构域转换过程
  • 批准号:
    9996243
  • 财政年份:
    1999
  • 资助金额:
    $ 39万
  • 项目类别:
    Continuing Grant
Cooperative Phenomena and Domain Switching Processes in Organic Inclusion Compounds
有机包合物中的协同现象和结构域转换过程
  • 批准号:
    9619191
  • 财政年份:
    1997
  • 资助金额:
    $ 39万
  • 项目类别:
    Continuing Grant
Energetic and Structural Studies of Functional Group Pairs for Materials Research
用于材料研究的官能团对的能量和结构研究
  • 批准号:
    9423726
  • 财政年份:
    1995
  • 资助金额:
    $ 39万
  • 项目类别:
    Continuing Grant
NATO Postdoctoral Fellow
北约博士后研究员
  • 批准号:
    8550662
  • 财政年份:
    1985
  • 资助金额:
    $ 39万
  • 项目类别:
    Standard Grant

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    2154700
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含氮分子及其周围:合成、不对称诱导和机理研究。
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    Discovery Grants Program - Individual
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含氮分子及其周围:合成、不对称诱导和机理研究。
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    RGPIN-2014-05281
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  • 批准号:
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