Structural and thermodynamic data on the pseudobinary phases R(Co1−xCux)5 WITH R ≡ Sm, Y, Ce

Thermodynamic modelling of the Co–Y system

“…Fig. 2 presents the standard enthalpies of formation in the Co-Y system with the experimental data determined [27][28][29] and predicted values by semi-empirical models [30,31].…”

“…In the present work, the phase relations and transformation temperatures are based on the phase diagram of the Co-Y system determined by Wu et al [6]. Because great diversity exists among the measured and predicted values of the enthalpy of formation of the Co-Y system [27][28][29] and the values predicted by Watson and Bennett [30] and the revised Miedema model [31], in the present work the experimental data determined by Subramanian and Smith [27] are given a larger weight.…”

“…The enthalpy of formation of Co 5 Y was measured by Meyer-Liautaud et al [28] and by Colinet and Pasturel [29]. Watson and Bennett [30] predicted the enthalpy of formation of CoY by a semi-empirical model based on the energy-band theory.…”

Magnetic structure and anisotropy of Ga- and Al-substitutedLaCo5andYCo5Može1, Pareti2, Paoluzi3 et al. 1996Phys. Rev. B32390View full textAdd to dashboardCite

“…Returning to the case of the compound YCo 4 B cited above, the same general considerations must be taken with care, since, even though B atoms are known to enter the 2c sites exclusively, and would cause a strong decrease in the anisotropy, the crystal structure is different ͑ordered CeCo 4 B structure͒ and the known occurrence of a first-order field-induced transition 30 frist-order magnetization process implies that higher-order anisotropy terms arise from the substitution. 31 The single-site model, however, does account for the anisotropy when Co is substituted by a 3d atom such as Cu in LaCo 5Ϫx Cu x and YCo 5Ϫx Cu x , 32 considering the known random nature of the Cu substitution on the 2c and 3g sites 12,33,34 ͑the random substitution reported in these references has been observed by three separate accurate neutron diffraction investigations but it is in contrast with a less detailed neutron study which suggests Cu substitution in 2c sites 35 ͒. These combined results indicate that the single-site approximation is not generally applicable.…”

Determination calorimetrique des enthalpies de formation en metallurgie

“…Avec les m6taux de transition ies temps de dissolution sont parfois trop longs et la temperature du bain doit &re augment6e. Meyer-Lieutaud et al [62][63], par exemple, ont dfi travailler A 1173 K pour mesurer l'enthalpie de formation des phases solides Sm-Co, Sm-Co-Cu, Y-Co-Cu et Ce-Co-Cu.…”