Chemical expansion of praseodymium-cerium mixed oxide films at high temperatures

镨-铈混合氧化物薄膜的高温化学膨胀

基本信息

项目摘要

The primary objective of the research project is to investigate the chemical expansion of thin films at high temperatures. The material to be studied is praseodymium-cerium mixed oxide (PCO) in the temperature range from 400 °C to 700 °C. The choice is motivated by considerably higher mechanical expansion upon insertion or removal of oxygen in comparison to e.g. high-temperature piezoelectric crystals. Compared to bulk material, PCO films offer the advantage of low time constants as short transport distances for oxygen occur. In addition to the chemical expansion, the defect structure in the layers and the time-determining atomic transport mechanisms have to be determined. The development, realization and test of a special interferometer or more precisely vibrometer, which is able to measure changes of the layer thickness in the sub-nanometer range even at frequencies of a few millihertz, represents an essential technical task. Through the development of a differential vibrometer and the use of signal diversity, the noise of the signal should be drastically reduced. The results and the new measuring method can be applied to other materials than the PCO model system, so that further insights into chemical expansion and small displacements in other mechanical systems can be obtained.The topic is highly relevant. However, hardly any data on the chemical expansion of thin films is available. They have been determined largely indirectly and show some contradictions. In contrast to structural materials and electronic functional materials, high-temperature actuator materials require extensive research. Such high temperature "artificial muscles" are e.g. demanded for energy conversion and space exploration.The applicants have complementary competences in the field of high-temperature materials and the development of vibrometers, which are well suited for solving the scientific challenge and which are unique in this combination. Furthermore, the work will be carried out in close cooperation with an author of the apparently only available publication on mechanical determination of PCO film expansion, so that the planned sample exchange provides comparable results.The preliminary work has shown that vibrometers are generally able to detect changes in the thickness of PCO films which are caused by electrochemical pumping of oxygen. A significant restriction, however, is the signal noise of standard vibrometers at low frequencies. Oxygen-equilibrium in the PCO films requires excitation frequencies of a few millihertz, where no meaningful measurements are possible so far. On the instrumentation side, for example, it has been shown that signal diversity significantly reduces noise.
该研究项目的主要目标是研究薄膜在高温下的化学膨胀。所要研究的材料是400°C至700°C温度范围内的Pr-Ce混合氧化物(PCO)。与高温压电晶体相比,之所以选择这种材料,是因为插入或去除氧气时的机械膨胀要比高温压电晶体高得多。与块体材料相比,PCO薄膜具有时间常数低的优点,因为氧气的传输距离较短。除了化学膨胀外,还必须确定层中的缺陷结构和决定时间的原子输运机制。研制、实现和测试一种专用干涉仪或更精确的振动仪,即使在几毫赫的频率下也能测量亚纳米范围内的膜层厚度变化,这是一项重要的技术任务。通过差动测振仪的研制和信号分集的使用,可以大大降低信号的噪声。该结果和新的测量方法可以应用于PCO模型系统以外的其他材料,从而可以进一步了解其他机械系统中的化学膨胀和小位移。然而,几乎没有关于薄膜化学膨胀的数据。它们在很大程度上是间接决定的,并显示出一些矛盾。与结构材料和电子功能材料相比,高温致动器材料需要广泛的研究。这种高温的“人造肌肉”是能量转换和太空探索的需要。申请者在高温材料领域和振动计的开发方面具有互补的能力,这两个领域非常适合解决科学挑战,在这一组合中是独一无二的。此外,这项工作将与显然是唯一一本关于PCO膜膨胀的机械测定的出版物的作者密切合作,以便计划中的样品交换提供可比较的结果。初步工作表明,振动仪通常能够探测到由电化学泵氧引起的PCO膜厚度的变化。然而,一个重要的限制是标准振动计在低频下的信号噪声。PCO薄膜中的氧平衡需要几毫赫的激发频率,到目前为止还不可能进行有意义的测量。例如,在仪器方面,已经证明信号分集显著降低了噪声。

项目成果

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Professor Dr.-Ing. Holger Fritze其他文献

Professor Dr.-Ing. Holger Fritze的其他文献

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{{ truncateString('Professor Dr.-Ing. Holger Fritze', 18)}}的其他基金

Assembly Technologies for Piezoelectric Sensors Operating up to 1000 °C
工作温度高达 1000 °C 的压电传感器的组装技术
  • 批准号:
    420186236
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Growth and characterization of single crystalline lithium niobate-tantalate (Li(Nb,Ta)O3) solid solutions for high-temperature sensor and actuator applications
用于高温传感器和执行器应用的单晶铌酸锂-钽酸锂 (Li(Nb,Ta)O3) 固溶体的生长和表征
  • 批准号:
    409656768
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
In-situ Methods to Determine High Oxygen Deficits in Ceria-Zirconia Mixed Oxides for Exhaust Gas Aftertreatment
废气后处理用氧化铈-氧化锆混合氧化物中高氧缺损的原位测定方法
  • 批准号:
    315514625
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Defect chemistry and electromechanical properties of piezoelectric Ca3TaGa3Si2O14 single crystals at extreme temperatures
极端温度下压电Ca3TaGa3Si2O14单晶的缺陷化学和机电性能
  • 批准号:
    266465665
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Epitaxial growth of piezoelectric oxide films
压电氧化膜的外延生长
  • 批准号:
    262765916
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Linking of Model and Commercial Active Materials for Lithium Ion Batteries by In-situ Determination of Thermodynamic and Kinetic Data
通过热力学和动力学数据的原位测定将锂离子电池的模型和商业活性材料联系起来
  • 批准号:
    180022048
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Hochtemperatur-Sensorik
高温传感器
  • 批准号:
    46301798
  • 财政年份:
    2007
  • 资助金额:
    --
  • 项目类别:
    Heisenberg Professorships
Piezoelektrische mikro-elektromechanische Systemkomponenten und Sensorsysteme in Langasit für Hochtemperaturanwendungen
兰加西特的压电微机电系统组件和传感器系统用于高温应用
  • 批准号:
    5412778
  • 财政年份:
    2003
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Development of high-temperature stable piezoelectric materials and electrodes
高温稳定压电材料及电极的开发
  • 批准号:
    5406737
  • 财政年份:
    2003
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Piezoelektrische Hochtemperaturmaterialien: Langasit und isomorphe Verbindungen
压电高温材料:硅锰矿及同象化合物
  • 批准号:
    5348225
  • 财政年份:
    2002
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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基于Riemann-Hilbert方法的相关问题研究
  • 批准号:
    11026205
  • 批准年份:
    2010
  • 资助金额:
    3.0 万元
  • 项目类别:
    数学天元基金项目

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