CAREER: The Synthesis and Characterization of New Ferroelectric - Second-Harmonic Generating Oxide Materials

职业：新型铁电-二次谐波氧化物材料的合成和表征

• 批准号: 0092054
• 负责人: P Shiv Halasyamani
• 金额: $ 53.36万
• 依托单位: University of Houston
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-03-15 至 2007-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0092054&HistoricalAwards=false
• 关键词: CAREER; Synthesis; Characterization; New; Ferroelectric

The aim of this project is the synthesis and characterization of a new class of electro-photonic oxides. Enhanced electro-photonic materials behavior will be achieved through cooperative structural and electronic distortions. The primary emphasis will be on the synthesis of new materials to include a new class of double perovskite compounds. The students involved in this research will be trained in solid-state techniques that will enable them to synthesize materials as both pure powders and single crystals. In addition to the standard solid-state synthetic techniques, a radio-frequency induction furnace will be utilized to grow large (5mm) crystals of the new materials. The new materials will be structurally characterized by powder and single crystal X-ray diffraction. These diffraction measurements will provide the students with a solid foundation in crystallography and crystallographic techniques. Variable temperature powder X-ray diffraction measurements will be undertaken in order to investigate phase changes, as well as elucidate the structural changes that occur during a ferroelectric to paraelectric phase transition. Once the materials have been structurally characterized, electro-photonic experiments will be performed. Second-harmonic generation and ferroelectric experiments will aid in deriving structure-property relationships. The relationships will impart to the students an understanding of materials properties with respect to synthesis and crystal structure. %%%Electro-photonic compounds find uses in dynamic random access memories (DRAM), frequency doubling (SHG), and Pockels cells. This integrated research and education project will provide graduate students with a thorough education in solid state materials chemistry areas such as synthesis, diffraction, and physical property measurements. The students wil be highly competitive in the job market as these materials and materials characterization areas are of significant importance to the industrial community.

本计画的目的是合成与表征一种新型的电-光子氧化物。增强的电光材料行为将通过协同的结构和电子畸变来实现。主要重点将是新材料的合成，包括一类新的双钙钛矿化合物。参与这项研究的学生将接受固态技术的培训，使他们能够合成纯粉末和单晶材料。 除了标准的固态合成技术外，还将利用射频感应炉来生长新材料的大（5毫米）晶体。新材料的结构特征将通过粉末和单晶X射线衍射进行表征。这些衍射测量将为学生提供晶体学和晶体学技术的坚实基础。将进行变温粉末X射线衍射测量，以调查相变，以及阐明在铁电顺电相变过程中发生的结构变化。 一旦材料的结构特征，将进行电子光子实验。二次谐波产生和铁电实验将有助于导出结构-性能关系。这些关系将使学生了解材料的合成和晶体结构特性。%电子光子化合物在动态随机存取存储器（DRAM）、倍频（SHG）和普克尔斯盒中找到用途。这个综合研究和教育项目将为研究生提供固态材料化学领域的全面教育，如合成，衍射和物理性能测量。学生将在就业市场上具有很强的竞争力，因为这些材料和材料表征领域对工业界具有重要意义。