SusChEM: Elucidating structure-property relationships in lead-free piezoelectrics

SusChEM：阐明无铅压电材料的结构-性能关系

• 批准号: 1606909
• 负责人: Michelle Dolgos
• 金额: $ 32万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-01 至 2019-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1606909&HistoricalAwards=false
• 关键词: SusChEM; Elucidating; structure; property; relationships

NON-TECHNICAL DESCRIPTION:Piezoelectric materials are found in a wide variety of applications as they can be used as components in both actuators and sensors. The industry standard and most commonly studied piezoelectric is Pb(Zr,Ti)O3 (PZT). A major concern in PZT is the lead, which puts manufacturing workers at risk and, introduces hazardous waste into the environment upon disposal of PZT-based components. The necessity for new piezoelectric materials clearly exists, but there is currently no good substitute for PZT. Many studies of PZT have led to a detailed understanding of how the crystal structure contributes to the enhanced properties, but little is known about the structures of its lead-free counter parts, slowing their development for use in applications. The aim of this study is to investigate the fundamental structure-property relationships in two key lead-free piezoelectric materials. The research provides a fundamental understanding that aids in the development of benign piezoelectric materials to improve the sustainability of electronic devices. This project is also strongly committed to expanding the opportunities available in student education and works to recruit and retain young scientists in science and engineering fields.TECHNICAL DETAILS:This research advances the fundamental understanding of structure-property relationships in piezoelectric ceramics. The goal of this project is to assess the local distortions from the average structure of two well-known lead-free piezoelectric materials at their morphotropic phase boundary (MPB) and correlate the structural information to observations of the measured properties. Ba,Ca(Zr,Ti)O3, the most promising lead-free piezoelectric material to date, and BaTiO3-BiInO3, a system with a non-traditional MPB are being investigated. Systems are being studied both poled and unpoled to examine the structural changes under real conditions. These detailed structural studies utilize X-ray and neutron diffraction as well as EXAFS, with analysis using the Pair Distribution Function method and Reverse Monte Carlo modelling. In addition, this project aims to recruit and retain young scientists in STEM fields and train graduate students to excel in their careers. Graduate students are participating in the Lens of the Market® program to learn how to translate their sustainable research ideas to innovation with the purpose of solving market problems. Freshman and sophomore undergraduates will be given the opportunity to work in the lab and gain the early research experiences that result in increased retention in the STEM fields. High school women and minority students in the Summer Experience in Science and Engineering for Youth (SESEY) summer program will participate in sustainable piezoelectric research to become engaged in the nation's science and engineering enterprise.

非技术描述：压电材料具有广泛的应用，因为它们可用作执行器和传感器中的组件，行业标准和最常研究的压电材料是 Pb(Zr,Ti)O3 (PZT)。 PZT 令人担忧的问题是铅，它使制造工人面临危险，并且在处理基于 PZT 的组件时将危险废物引入环境。显然存在对新型压电材料的需求。目前还没有很好的 PZT 替代品。对 PZT 的许多研究已经深入了解了晶体结构如何有助于增强性能，但对其无铅对应部件的结构知之甚少，从而减缓了其在应用领域的开发。本研究的目的是研究两种关键无铅压电材料的基本结构-性能关系，该研究提供了有助于开发良性压电材料以提高电子设备的可持续性的基本认识。强烈地致力于扩大学生教育的机会，并致力于招募和留住科学和工程领域的年轻科学家。技术细节：这项研究增进了对压电陶瓷结构与性能关系的基本理解。该项目的目标是评估压电陶瓷的结构与性能关系。两种著名的无铅压电材料在其同形相界 (MPB) 处的平均结构的局部变形，并将结构信息与测量的性能观察结果相关联。迄今为止有前景的无铅压电材料，以及具有非传统 MPB 的 BaTiO3-BiInO3 系统正在研究中，以检查实际条件下的结构变化。射线和中子衍射以及 EXAFS，并使用对分布函数方法和逆蒙特卡罗建模进行分析。此外，该项目旨在招募和留住 STEM 领域的年轻科学家，并培训研究生。在职业生涯中取得优异成绩的研究生正在参加“市场之镜”项目，学习如何将他们的可持续研究理念转化为创新，以解决市场问题。新生和本科生将有机会在实验室工作。并获得早期研究经验，从而提高青年科学与工程暑期体验 (SESEY) 暑期项目中高中女性和少数族裔学生的参与度，从而参与可持续压电研究，从而投身于国家科学事业。和工程企业。