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- W2075333470 abstract "${mathrm{PrTiFe}}_{11ensuremath{-}x}{mathrm{Co}}_{x}$ alloys $(x<~3)$ prepared by melting and subsequent annealing have been investigated with their carbides ${mathrm{PrTiFe}}_{11ensuremath{-}x}{mathrm{Co}}_{x}{mathrm{C}}_{y}$ $(y=1)$ synthesized by means of reaction with solid hydrocarbon at 750 K. X-ray diffraction analysis by Rietveld method has shown that both series crystallize in the tetragonal ${mathrm{ThMn}}_{12}$-type structure. From x-ray studies of magnetic aligned samples, the magnetic anisotropy of the carbided alloys is found to turn uniaxial. Their Curie temperature enhancement is linearly correlated to the volume expansion of the host lattice upon carbonation. The Mossbauer spectra recorded from 77 to 293 K, have been analyzed on the basis of the binomial law, related to the different Fe nearest neighbor in the assumption of Ti atoms distributed in $8i$ sites. The hyperfine parameter sets were assigned according to the relationship between the Wigner Seitz cell volume of each iron site and their isomer shift $ensuremath{delta}$ so that $ensuremath{delta}{8i}>ensuremath{delta}{8j}>ensuremath{delta}{8f}.$ It results that Co preferentially occupies the $8f$ site with the recurrent sequence ${H}_{mathrm{HF}}{8i}>{H}_{mathrm{HF}}{8f}>{H}_{mathrm{HF}}{8j}.$ The increase with Co content of hyperfine field, is correlated to the increase of the core electron polarization field ruled by the asymmetrical filling of the $3d$ band by the additional $3d$ Co electron. Upon carbonation, both the hyperfine fields and the isomer shifts increase in agreement with the unit cell expansion and the increased Curie temperature of ${mathrm{PrTiFe}}_{11ensuremath{-}x}{mathrm{Co}}_{x}mathrm{C}$ as compared to ${mathrm{PrTiFe}}_{11ensuremath{-}x}{mathrm{Co}}_{x}.$" @default.
- W2075333470 created "2016-06-24" @default.
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- W2075333470 date "2002-08-20" @default.
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- W2075333470 title "Crystallographic and hyperfine parameters of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi mathvariant=normal>PrTi</mml:mi><mml:mo>(</mml:mo><mml:mi mathvariant=normal>Fe</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant=normal>Co</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>11</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and their carbides" @default.
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- W2075333470 doi "https://doi.org/10.1103/physrevb.66.054430" @default.
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