Abstract
We report on the effects of carbon non-stoichiometry and of annealing conditions on the superconducting (SUP) properties of HoNi2B2Cx (x from 0.6 to 1.4). Using nuclear- and electron- probe microanalysis, respectively NPMA and EPMA, we show that for samples with x=0.8, 1.0 and 1.2, (from non SUP to SUP via re-entrance) the final carbon-compositions of the matrix when x≤l follow the general tendency of the nominal compositions whereas for x>l the final composition is x=l. We will discuss these results in relation with the various observed physical behaviors. The non-stoichiometry is also accommodated by the formation of several secondary phases. Our results indicate also that HoNi2B2C has a domain of existence on the C-poor side and, if it exists, a very narrow one on the C-rich side.
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Alleno, E., Berger, P., Leroy, E., Godart, C. (2001). Recent Aspects of Non Stoichiometry Effects on the Superconducting Properties of HoNi2B2Cx (x=0.6 to 1.4). In: Müller, KH., Narozhnyi, V. (eds) Rare Earth Transition Metal Borocarbides (Nitrides): Superconducting, Magnetic and Normal State Properties. NATO Science Series, vol 14. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0763-4_27
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DOI: https://doi.org/10.1007/978-94-010-0763-4_27
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