Microstructures and hydrogen absorption–desorption behavior of an A2B7-based La-Mg-Ni alloy
| Autor: | Z. Wu, Zaoxiao Zhang, Haruyuki Inui, Kyosuke Kishida, Jun Ishida, Shigekazu Yasuoka |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment Scanning electron microscope 05 social sciences Alloy Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Amorphous solid Hydrogen storage Crystallography Fuel Technology Chemical engineering chemistry Transmission electron microscopy Phase (matter) 0502 economics and business Scanning transmission electron microscopy engineering 050207 economics 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 42:22159-22166 |
| ISSN: | 0360-3199 |
| Popis: | The microstructural changes during hydrogen absorption–desorption cycles of an A2B7-based La-Mg-Ni alloy with a nominal composition of La1.5Mg0.5Ni7.0 were systematically investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). The ternary La-Mg-Ni alloy was mostly composed of 2H-A2B7 phase with minor inclusions of 3R-A5B19, 2H-A5B19 and 3R-AB3 phases existing as parts of intergrowth structures with the major A2B7 phase. Most parts of the major 2H-A2B7 phase containing Mg exhibited an excellent crystal structure retention after the hydrogen absorption–desorption cycles at 80 °C. Two types of defected bands were found to develop after the first hydrogen absorption–desorption cycle. The first ones are amorphous bands developed inside the minor 3R-AB3 phase, while the second ones develop as heterogeneously strained regions inside the major 2H-A2B7 phase. Both the defected bands are considered to be responsible for the irreversible hydrogen capacity of the A2B7-based La1.5Mg0.5Ni7.0 alloy during the hydrogen absorption–desorption cycles at 80 °C. |
| Databáze: | OpenAIRE |
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