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2009 | 115 | 1 | 409-412
Article title

Activation Energies of Crystallization in Amorphous RMn_{4.5}Ge_{4.5}Fe_{1.5}Al_{1.5} (R = La, Y, Dy) Alloys

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Abstracts
EN
The effective activation energies, characteristic crystallization temperatures and enthalpies of amorphous RMn_{4.5}Ge_{4.5}Fe_{1.5}Al_{1.5} (R = Y, La, Dy) alloys produced using melt-spinning technique were investigated by differential scanning calorimetry. X-ray diffraction measurements were performed for as-quenched and annealed samples. The crystalline structure of annealed YMn_{4.5}Ge_{4.5}Fe_{1.5}Al_{1.5} and DyMn_{4.5}Ge_{4.5}Fe_{1.5}Al_{1.5} alloys was determined as orthorhombic TbFe_6Sn_6-type with Cmcm (63) space group. The alloy with Y appears as a more useful non-magnetic analogue for DyMn_{4.5}Ge_{4.5}Fe_{1.5}Al_{1.5} than the La-based alloy. The differential scanning calorimetry curves for Dy- and Y-based alloys also exhibit similar thermal behavior. The effective activation energies E_a were determined using the Kissinger approach and high values up to 778±74 kJ/mol for La-based sample were established. The comparison of Y-, La-, and Dy-based alloys suggests improvement of thermal stability with the increase in rare-earth element atomic radius in the glassy RMn_{4.5}Ge_{4.5}Fe_{1.5}Al_{1.5} systems.
Keywords
Year
Volume
115
Issue
1
Pages
409-412
Physical description
Dates
published
2009-01
References
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv115n1120kz
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