Charge state of rare earth ions and glass transition in the glassy Al85Ni10R5 alloys
A glassy Al85Ni10La5 alloy has a supercooled-liquid region of 16 K between a glass transition temperature at 526 K and a crystallization temperature at 542 K, while Al85Ni10Eu5 has no supercooled-liquid region and crystallizes at 514 K. 151Eu Mössbauer spectroscopic study reveals that the Eu ions in Al85Ni10Eu5 are divalent, although the charge state of La ions is naturally considered to be trivalent in Ai85Ni10La5. It is supposed that the thermal stability of this glassy alloy system strongly depends on not only the ionic radius of rare earth element but also the electronic state.
Keywordsglassy alloy Mössbauer effect charge state glass transition supercooled liquid spin glass
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