RUI: Collaborative Research: Acoustic Study of Lattice Dynamics and Elastic Properties in Perovskite Dielectrics and Ferroelectrics
RUI:合作研究:钙钛矿电介质和铁电体中晶格动力学和弹性特性的声学研究
基本信息
- 批准号:1709781
- 负责人:
- 金额:$ 28.73万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2017
- 资助国家:美国
- 起止时间:2017-07-01 至 2023-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Non-technical Summary: Research teams at Gordon College and Towson University are collaborating in this project to carry out a comprehensive study of structural, electrical and elastic/acoustic properties of two technologically important materials, Strontium Titanate and Potassium Tantalum Niobate, with a focus on how their properties change when bulk (large size scales common in everyday uses) material is progressively thinned to layers approaching atomic scale sizes. These materials demonstrate unique and novel properties when grown in microscopic volumes in the form of atomically thin layers. The project enhances the knowledge base for a new generation of novel nano-electromechanical devices that can be integrated on microchips in future electronics, including radiofrequency and optical signal processing circuits useful for numerous technologies serving both civil and defense sectors. This collaboration brings together faculty and students in two predominantly undergraduate institutions to engage in experimental and theoretical research at the frontiers of materials physics. Through the integration of research and education, the proposed effort positively impacts the educational experience of undergraduate physics students at both institutions and graduate students in the Applied Physics Master?s program at Towson University. Students are expected to participate in the planning, developing equipment and theoretical models, performing measurements and computer simulations, presenting results of their work at scientific conferences and publishing in scientific journals. Such educational experiences integrated with research are key to developing a globally competent science, technology, engineering and mathematics (STEM) work force.Technical description. This project investigates spontaneous and electric-field induced phase transitions in perovskites by using a combination of ultrasound pulse-echo probing of acoustic phonons, along with dielectric and Raman spectroscopies. The experimental studies are complemented by theoretical inquiry using first principle density functional theory calculations and Monte Carlo-based simulations of phonon transport. Investigations begin by carefully extending models for single crystals of ferroelectric potassium tantalum niobate to para-electric strontium titanate single crystals. Models are then further developed for reduced-dimensional systems, including strontium titanate films and microbridge devices. The thin film samples for the experiments are grown by pulsed laser deposition which allows for the careful manipulation of a wide range of parameters that can be used to control the films strain state, stoichiometry and defect structure. The structural quality of the films is monitored using X-ray diffraction, while the films morphology and defect structure studies are performed by scanning electron microscopy and atomic force microscopy. The cation stoichiometry is determined using electron energy dispersive spectroscopy. The reduced dimensionality effects are explored in connection with lattice mismatch strain, which is engineered by choosing substrates that cause bi-axial tensile or compressive stresses. Acoustic measurements in the films are performed using specially designed surface acoustic wave devices. In order to exclude the influence of substrate, microbridges of free standing thin films are employed. The results of this research open up new approaches to exploring phase transition phenomena. Systematic investigation of ferroelectricity in thin films is of significance for technological applications in electro-mechanical, electro-optical and acousto-optical devices.
非技术摘要:Gordon College和Towson University的研究团队正在该项目中合作,对两种具有重要技术价值的材料--钛酸锶和铌酸钾--的结构、电学和弹性/声学性能进行全面研究,重点是当块状材料(日常使用的大尺寸材料)逐渐变薄到接近原子尺寸的层时,它们的性能将如何变化。当以原子薄层的形式在微观体积中生长时,这些材料显示出独特和新颖的特性。该项目增强了新一代新型纳米机电设备的知识库,这些设备可以集成在未来电子产品的微芯片上,包括射频和光学信号处理电路,这些电路可用于许多服务于民用和国防部门的技术。这一合作将两个以本科为主的机构的教职员工和学生聚集在一起,从事材料物理前沿的实验和理论研究。通过研究和教育的整合,拟议的努力对两所院校的本科生和陶森大学应用物理硕士S项目的研究生的教育体验产生了积极的影响。学生将参与计划,开发设备和理论模型,进行测量和计算机模拟,在科学会议上展示他们的工作结果,并在科学期刊上发表文章。这种与研究相结合的教育经验是发展一支具有全球竞争力的科学、技术、工程和数学(STEM)工作队伍的关键。本项目结合声学声子的超声脉冲回波探测,以及介电和拉曼光谱,研究了钙钛矿中的自发相变和电场诱导的相变。实验研究的补充是用第一性原理密度泛函理论计算和基于蒙特卡罗的声子输运模拟的理论探讨。研究首先仔细地将铁电的钽酸钾单晶体的模型扩展到顺电的钛酸锶单晶。然后进一步开发降维系统的模型,包括钛酸锶薄膜和微桥器件。实验所用的薄膜样品是通过脉冲激光沉积生长的,它允许仔细地操纵各种参数,这些参数可以用来控制薄膜的应变状态、化学计量比和缺陷结构。用X射线衍射仪对薄膜的结构质量进行了检测,用扫描电子显微镜和原子力显微镜对薄膜的形貌和缺陷结构进行了研究。用电子能谱测定了阳离子的化学计量比。降维效应与晶格失配应变有关,晶格失配应变是通过选择引起双向拉应力或压应力的衬底来实现的。薄膜中的声学测量是使用专门设计的表面声波设备进行的。为了排除衬底的影响,采用了自支撑薄膜的微桥技术。这一研究结果为探索相变现象开辟了新的途径。对薄膜中铁电性的系统研究对机电、电光和声光器件的技术应用具有重要意义。
项目成果
期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Thickness dependent electrical resistivity modulation in tensile-strained epitaxial thin films of calcium manganese oxide
钙锰氧化物拉伸应变外延薄膜中厚度依赖的电阻率调制
- DOI:10.1063/5.0047607
- 发表时间:2021
- 期刊:
- 影响因子:1.6
- 作者:Hart, Cacie;Warecki, Zoey;Yong, Grace;Houston, David;Kolagani, Rajeswari
- 通讯作者:Kolagani, Rajeswari
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Rajeswari Kolagani其他文献
Application of Ion Energy Spectroscopy to Optimize the Pulsed Laser Deposition Parameters for SrTiO3−y Films
- DOI:
10.1007/s11664-025-11952-1 - 发表时间:
2025-04-27 - 期刊:
- 影响因子:2.500
- 作者:
Marcus Rose;R. Shipra;Jeonggoo Kim;Shiva Pokhrel;Richard Seabrease;Ryan Paxson;Madison Previti;David Schaefer;Rajeswari Kolagani - 通讯作者:
Rajeswari Kolagani
Rajeswari Kolagani的其他文献
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{{ truncateString('Rajeswari Kolagani', 18)}}的其他基金
GOALI: Developing Uncooled Microbolometer Arrays Based on Thin Films of Hole Doped Rare Earth Perovskite Manganite Materials
GOALI:开发基于空穴掺杂稀土钙钛矿锰酸盐材料薄膜的非冷却微测辐射热计阵列
- 批准号:
1128586 - 财政年份:2011
- 资助金额:
$ 28.73万 - 项目类别:
Standard Grant
MRI: X-ray Diffractometer for Material Research
MRI:用于材料研究的 X 射线衍射仪
- 批准号:
0421141 - 财政年份:2004
- 资助金额:
$ 28.73万 - 项目类别:
Standard Grant
Development of a Regional Materials Research Facility at Towson University
陶森大学区域材料研究设施的发展
- 批准号:
0116619 - 财政年份:2001
- 资助金额:
$ 28.73万 - 项目类别:
Standard Grant
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