The Structural Change of Lanthanum Thin Films by Hydrogenation and Dehydrogenation
JOURNAL OF THE JAPAN INSTITUTE OF METALS(2004)
摘要
Structural change in hydrogenation and dehydrogenation processes of La films was investigated. La/Pd films were produced at substrate temperatures of 300 K-573 K on a SiO2 substrate using magnetron-sputtering equipment. La/Pd films were hydrogenated under a pressure of 1.0 x 10(5) Pa in a vacuum chamber. Phase transition from La to LaHx (2 < x < 3) by hydrogenation resulted in a 6- to 10-fold increase of resistivity. Hydrogenation and dehydrogenation readily occurred near room temperature for La/Pd films. The ratio of the growth direction of [0001] to [1010] changed with substrate temperature in the as sputtered La films. When the growth direction of La film was [1010], the rate of hydrogenation became slow in comparison with that of [0001]. The direction of the La films changed to the [111] direction of LaHx after hydrogenation, though the initial directions of La films were [0001] and [1010]. The processes of hydrogenation and dehydrogenation may affect oxygen which remains inside the La films. In dehydrogenation at room temperature, LaHx (2 < x < 3) was transformed to LaH2, but not to La.
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关键词
rare-earth,thin-film,lanthanum,LaHx,sputtering,hydrogenation,electron spectroscopyfor chemical analysis,phase transition
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