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：压电材料在各种各样的应用中被发现，因为它们可以用作驱动器和传感器的组件。工业标准和最常研究的压电材料是Pb(Zr,Ti)O3 （PZT）。PZT的一个主要问题是铅，它使制造工人处于危险之中，并在处置PZT组件时向环境中引入有害废物。开发新型压电材料的必要性是显而易见的，但目前还没有好的压电材料替代品。对PZT的许多研究已经详细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，这减慢了它们在应用中的发展。本研究的目的是探讨两种关键的无铅压电材料的基本结构-性能关系。该研究提供了一个基本的理解，有助于良性压电材料的发展，以提高电子设备的可持续性。该项目还坚定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：本研究促进了对压电陶瓷结构-性能关系的基本理解。本项目的目的是评估两种众所周知的无铅压电材料在其嗜形相边界（MPB）的平均结构的局部畸变，并将结构信息与测量特性的观察相关联。Ba,Ca(Zr,Ti)O3（迄今为止最有前途的无铅压电材料）和BaTiO3-BiInO3（一种具有非传统MPB的系统）正在进行研究。对系统进行了极点和非极点的研究，以检查实际条件下的结构变化。这些详细的结构研究利用x射线和中子衍射以及EXAFS，并使用对分布函数方法和反向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，培养研究生在职业生涯中脱颖而出。研究生们正在参加市场的镜头®计划，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。大一和大二的本科生将有机会在实验室工作，获得早期的研究经验，从而提高STEM领域的保留率。参加青少年科学与工程暑期体验项目（SESEY）的高中女生和少数族裔学生将参与可持续压电研究，成为国家科学与工程企业的一员。