Thermodynamics and Microstructure of Oxides

这项研究是一种特殊的创造力的更新 扩展奖。 先前的赠款是非常富有成效的， 在20多篇被引用的科学期刊上发表 制备多于五次的加成。 的摘要 重要的成就包括决心， 钛酸钡陶瓷中的缺陷结构非常 这取决于材料的处理， 注意到化学计量的差异; β的缺陷结构 氧化铝固体电解质既具有长程有序性， 范围无序，这取决于化学计量和 热历史; β氧化铝中的混合离子效应是 解释并表明与缺陷结构有关 （电导率变化多达几千倍， 相同的材料）;固体电解质， 用离子交换法合成了一种新型的纳米晶， 技术. 更新补助金将重点研究 增加对关键化学因素的了解 影响氧化物陶瓷的结构和性能， 利用这种理解合成新的氧化物。 材料 正在研究的包括层状过渡金属氧化物， 氧化铜和镧系β氧化铝。 分析 所用的技术包括高分辨率电子显微镜、X-射线衍射、X-射线衍射和X-射线衍射。 射线衍射，拉曼光谱，红外光谱， 热分析和电子表征（电导率， 介电损耗、磁化率）。 正在研究的材料具有技术 重要性，因为它们在热 电池、激光器、高温超导体、 用于通信等。

This research is the renewal of a special Creativity Extension Award. The prior grant was highly productive resulting in more than twenty publications in refereed scientific journals with more than five addition being prepared. A summary of the significant accomplishments includes determination that the defect structure in barium titanate dielectrics was very dependent upon the processing of the material with little difference in stoichiometry noted; the defect structure of beta alumina solid electrolytes has both long range order and long range disorder which depends upon the stoichiometry and the thermal history; the mixed ion effect in beta alumina was explained and shown to be related to the defect structure (conductivity varies by as much as several thousand times for the same material); solid electrolytes with more control of the structure and properties were synthesized using ion exchange techniques. The renewal grant will emphasize research on increased understanding of the critical chemical factors affecting the structure and properties of oxide ceramics and on synthesis of new oxides using this understanding. Materials being investigated include layered transition metal oxides, copper oxides, and lanthanide beta alumina. Analytical techniques used include high resolution electron microscopy, x- ray diffraction, Raman spectroscopy, infrared spectroscopy, thermal analysis, and electronic characterization (conductivity, dielectric loss, magnetic susceptibility). The materials being investigated have technological importance because of their potential application in thermal batteries, lasers, high temperature superconductors, dielectrics for communications etc.