Nanograin BaTiO3 Ceramics for Dielectric, Ferroelectric and Piezoelectric Applications

用于介电、铁电和压电应用的纳米晶 BaTiO3 陶瓷

• 批准号: 0907523
• 负责人: I-Wei Chen
• 金额: $ 43.5万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-01 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0907523&HistoricalAwards=false
• 关键词: Nanograin; BaTiO3; Ceramics; Dielectric; Ferroelectric

NON-TECHNICAL DESCRIPTION: Every year 1,000 trillion new pieces of multilayer ceramic capacitors enter the market inside the consumer, industrial and military products, and as their sizes shrink their microstructure features are projected to approach the nanomaterial scale within the next decade. This project will focus on BaTiO3, the ceramic material used in these capacitors, to determine the most important material parameters required to propel continued advances into the next generations. The project will also provide rich educational and research opportunities to engage students and educators in the Philadelphia area and in the larger community. In particular, the University of Puerto Rico-Humacao will benefit by gaining internet access to some measurement instruments in the Penn laboratory. TECHNICAL DETAILS:This project will investigate nanograin BaTiO3 ceramics for possible dielectric, ferroelectric and piezoelectric applications. By varying the grain size, grain boundary charge and crystal stability of the nanograin ceramics, it will seek to engineer a tunable nanocomposite without apparent compositional inhomogeneity. The composite effect will rely on charge/defect-induced internal fields to smear structural transitions and clamp polarization, creating stable dielectrics with temperature-independent dielectric responses. Such possibility was not previously available in conventional ceramics because until the advent of nanomaterials, the width of the space charge zone has been much less than the grain size. The project will take advantage of a recent breakthrough in sintering technology that allows densification without grain growth, which avails nanograin BaTiO3 ceramics. Integrated research and educational activities built around laboratory discoveries will train new students in the field of nano electronic materials for future innovation and development.

非技术描述：每年有 1,000 万亿个新多层陶瓷电容器进入消费、工业和军用产品市场，随着其尺寸缩小，其微观结构特征预计将在未来十年内接近纳米材料尺寸。该项目将重点关注这些电容器中使用的陶瓷材料 BaTiO3，以确定推动下一代技术不断进步所需的最重要的材料参数。该项目还将提供丰富的教育和研究机会，吸引费城地区和更大社区的学生和教育工作者。特别是，波多黎各大学乌马考分校将通过获得宾夕法尼亚大学实验室的一些测量仪器的互联网访问而受益。技术细节：该项目将研究纳米晶 BaTiO3 陶瓷的可能介电、铁电和压电应用。通过改变纳米晶陶瓷的晶粒尺寸、晶界电荷和晶体稳定性，它将寻求设计一种没有明显成分不均匀性的可调谐纳米复合材料。复合效应将依赖于电荷/缺陷引起的内部场来涂抹结构转变和钳位极化，从而产生具有与温度无关的介电响应的稳定电介质。这种可能性以前在传统陶瓷中是不存在的，因为直到纳米材料出现之前，空间电荷区的宽度一直远小于晶粒尺寸。该项目将利用烧结技术的最新突破，无需晶粒生长即可实现致密化，从而利用纳米晶 BaTiO3 陶瓷。围绕实验室发现建立的综合研究和教育活动将培训纳米电子材料领域的新生，以促进未来的创新和发展。