The dynamic nature of hydrogen in the α and β phases in the Gd(0001)/W(110) system: STM observations
| Autor: | Yishay Manassen, N. Shamir, H. Realpe, Moshe H. Mintz |
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| Rok vydání: | 2009 |
| Předmět: |
Hydrogen
Hydride Precipitation (chemistry) Mechanical Engineering Metals and Alloys Analytical chemistry Nucleation chemistry.chemical_element Substrate (electronics) law.invention Crystallography chemistry Mechanics of Materials law Phase (matter) Materials Chemistry Scanning tunneling microscope Dissolution |
| Zdroj: | Journal of Alloys and Compounds. 473:521-529 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2008.06.013 |
| Popis: | Scanning tunneling microscopy was utilized to follow the effects of low dose exposures of hydrogen on Gd(0 001 )islands grown on a W(1 1 0) substrate. Two types of time fluctuating effects were observed. First, periodic appearance-disappearance of some of the Gd islands, which was attributed to concentration fluctuations of H dissolved in the -phase. Second, the development of hydride -phase nuclei displayed irregular growth-shrinkage behavior, concurrent with irregular morphological variations. This behavior was also attributed to H concentration time-variations induced by the strain field that accompanies the hydride growth. It seems thus that both, the H dissolution in the -phase, and the precipitation of the hydrides (-phase) within the -phase, display irregular "wave" like behavior in this system. © 2008 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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