Pressure-temperature phase diagram of lithium aliminum hydride.

机译：氢化铝锂的压力-温度相图。

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High pressure behavior of complex hydrides is investigated in this thesis. Raman spectroscopy was performed at different temperatures and pressures to determine structural changes in LiAlH4. In situ high-pressure/high-temperature Raman spectroscopy experiments were carried out using resistively heated diamond anvil cells up to 150°C and 7 GPa. High pressure experiments performed at room temperature showed transformation of the monoclinic alpha-LiAlH 4 to delta-LiAlH4 phase at ∼3.25 GPa. As the temperature is increased to ∼100°C both the alpha and delta phases transform to beta-LiAlH4 and remain stable up to 5.5 GPa. A new gamma-LiAlH 4 phase forms at temperatures greater than 300°C. The data obtained in this thesis was used along with that of Konovalov and Bulychev (1995) to construct the PT phase diagram of LiAlH4 and to define beta and gamma-LiAlH4 phase boundaries. Decomposition data of Block and Gray (1965) was also analyzed to define the decomposition boundary.

机译：本文研究了复合氢化物的高压行为。拉曼光谱在不同的温度和压力下进行，以确定LiAlH4的结构变化。原位高压/高温拉曼光谱实验是使用电阻加热的金刚石砧盒（最高150°C和7 GPa）进行的。在室温下进行的高压实验显示，单斜α-LiAlH4在〜3.25 GPa时转变为δ-LiAlH4相。当温度升高到约100°C时，α相和δ相都会转变为β-LiAlH4，并在高达5.5 GPa的时间内保持稳定。在高于300°C的温度下会形成新的γ-LiAlH4相。本论文获得的数据与Konovalov和Bulychev（1995）的数据一起用于构建LiAlH4的PT相图，并定义β和γ-LiAlH4的相界。还分析了Block and Gray（1965）的分解数据以定义分解边界。

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作者
Fallas Chinchilla, Juan Carlos.;
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University of Nevada, Reno.;

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授予单位 University of Nevada, Reno.;
学科 Engineering Materials Science.
学位 M.S.
年度 2009
页码 89 p.
总页数 89
原文格式 PDF
正文语种 eng
中图分类工程材料学;
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Pressure-temperature phase diagram of lithium aliminum hydride.

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