Mossbauer Studies of Advanced Superconducting Materials

先进超导材料的穆斯堡尔研究

• 批准号: 8719738
• 负责人: Clyde Kimball
• 金额: $ 30.62万
• 依托单位: Northern Illinois University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-01-15 至 1992-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8719738&HistoricalAwards=false
• 关键词: Mossbauer; Studies; Advanced; Superconducting; Materials

Professor Kimball will investigate the lattice dynamics of superconducting systems containing small concentrations of iron using Mossbauer spectroscopy. The influence of the 3d transition elements on superconducting and magnetic properties will be determined. Vibrational states in the high temperature oxide superconductors will be probed with substitutions of rare earth ions for yttrium and of tin or ion for copper. At a critical iron concentration the lattice transforms from orthorhombic to tetragonal. Mossbauer and neutron diffraction will be used to delineate the oxygen anion order-disorder transformation between phases of these compounds and to observe the magnetic behavior in the disordered phase. Neutron diffraction measurements in the BaPb1-xBicO3 superconductors will continue as will a search for other high temperature superconducting materials of the oxides and sulphides.

Kimball教授将研究 含少量铁的超导系统 使用穆斯堡尔光谱。 3D转换的影响 超导和磁性的元素， 测定 高温氧化物中的振动态 超导体将用稀土替代物来探测 钇和锡的离子或铜的离子。 在关键 铁浓度时，晶格由斜方晶系转变为 四氢呋喃。 穆斯堡尔和中子衍射将用于 描绘氧阴离子有序-无序之间的转换 这些化合物的相，并观察磁性行为， 无序的阶段。 中子衍射测量 BaPb 1-xBicO 3超导体将继续寻找 氧化物的其它高温超导材料 和硫化物。