Magnetic Resonance Studies of Solids

小行星9403667 金属氘化物的魔角旋转将产生不同位置的氘原子的分离的、分辨的核磁共振（NMR）线。 该技术将用于了解金属合金和化合物的占位，以帮助开发用于氢燃料存储和电化学电池的改进材料。 许多金属陶瓷在高温下的反常弛豫可能是由于氢分子的快速气固交换引起的。 氩气超压可以减少气相弛豫，从而测试这种机制，特别是在面心立方衍射。 纳米复合材料是一种新型的高强度材料，虽然材料是由非常小的（例如20 nm）颗粒压实制成的，有时在更延展的基质中。 为了了解它们的不寻常性质，NMR将探测关键的界面。 具体来说，NMR将确定原子尺度上的界面面积和芯-包层结合的性质。 将开发用于探测、测量和操纵异常宽共振的技术。 应用将包括生物系统中氮十四和碳十三之间的双共振距离测定。 % % % % 金属氧化物是清洁能源技术、氢燃料储存和电池的有吸引力的候选物。 氢（或氘）原子在结构中的位置将通过将魔角自旋核磁共振应用于氘化金属合金和化合物来确定。 研究结果将指导改进储氢材料的开发。 在高温下，许多金属离子表现出一种无法解释的自旋弛豫机制。 一种解释是气体和固体之间发生了快速交换;也有人提出了更奇特的解释。 氢在无法解释的弛豫中的作用将被测试。 纳米复合材料是一种新型的高强度、坚韧材料，它是由非常小的（20 nm）晶粒在更易延展的基体中压实而成。 界面晶粒是影响复合材料力学性能的关键因素。 核磁共振（NMR）将用于测量原子尺度上的界面面积，并确定芯-包层结合的性质。将开发探测、测量和操纵非常宽的核磁共振谱线的技术，否则这些谱线将无法使用。 生物结构的应用和氮的检测（例如在爆炸物中）将继续进行。 ***

9403667 Conradi Magic-angle spinning of metal-deuterides will yield separate, resolved nuclear magnetic resonance (NMR) lines for Deuterium atoms at inequivalent sites. This technique will be used to understand the site occupation in metallic alloys and compounds, to assist in the development of improved materials for hydrogen fuel storage and electrochemical cells. The anomalous relaxation in many metal-hydrides at high temperatures may arise from rapid gas-solid exchange of hydrogen molecules. Argon overpressures can reduce the gas-phase relaxation and thereby test this mechanism, specifically in the face centered cubic dihydrides. Nanocomposites are a new class of high strength, though materials made by compaction of extremely small (e.g. 20 nm) grains, sometimes in a more ductile matrix. To understand their unusual properties, NMR will probe the crucial interfaces. Specifically, NMR will determine the interfacial area on an atomic scale and the nature of core-cladding bonding. Techniques will be developed for detection, measurement, and manipulation of unusually broad resonances. Applications will include double-resonance distance determinations in biological systems between Nitrogen fourteen and Carbon thirteen. % % % % Metal hydrides are attractive candidates for clean energy technologies, for hydrogen fuel storage and electrical batteries. The location of Hydrogen (or Deuterium) atoms in the structures will be determined by applying magic-angle spinning nuclear magnetic magnetic resonance to deuterided metallic alloys and compounds. The results will direct the development of improved hydrogen storage materials. At high temperatures, many metals- hydrides exhibit an unexplained mechanism of spin-relaxation. One suggestion is that rapid exchange between the gas and solid occurs; more exotic explanations have also been proposed. The role of hydrogen in the unexplained relaxation will be tested. Nanocomposites are a new class of high stre ngth, tough materials made by compaction of extremely small (20 nm) grains, often in more ductile matrix. The interfaces grain are crucial to the mechanical properties. Nuclear magnetic resonance (NMR) will be used to measure the interfacial area on an atomic scale and to determine the nature of the core-cladding bond. Techniques will be developed for the detection, measurement and manipulation of very broad NMR lines, which otherwise unusable. Applications to biological structures and the detection of Nitrogen (e.g. in explosives) will be pursued. ***