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Atomic structure of ${\text{Co}}_{43}{\text{Fe}}_{20}{\text{Ta}}_{5.5}{\text{B}}_{31.5}$ metallic glass has been studied with x-ray and neutron diffraction, extended x-ray absorption fine structure experiments, and reverse Monte Carlo modeling. Each boron atom is found to have an average 2.3 nearest boron neighbors, which is significantly higher than in binary ${\text{Co}}_{81.5}{\text{B}}_{18.5}$ and ${\text{Fe}}_{80}{\text{B}}_{20}$ glasses. The existence of Ta-based structural units with the composition close to the stoichiometry of the ${(\text{Co},\text{Fe})}_{21}{\text{Ta}}_{2}{\text{B}}_{6}$ crystalline phase precipitating upon annealing of the glass is established. Ta-B and B-B bonds, which are absent in the crystalline state, are suggested to be responsible for the high glass-forming ability and thermal stability of the ${\text{Co}}_{43}{\text{Fe}}_{20}{\text{Ta}}_{5.5}{\text{B}}_{31.5}$ glass.

physical review b

Topological and chemical ordering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Co</mml:mtext></mml:mrow><mml:mrow><mml:mn>43</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mrow><mml:mn>20</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Ta</mml:mtext></mml:mrow><mml:mrow><mml:mn>5.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mtext>B</mml:mtext><mml:mrow><mml:mn>31.5…

Topological and chemical ordering inCo43Fe20Ta5.5B31.5…