Abstract
The thermodynamic and magnetic properties for Dy2Fe14B, a principal constituent of rare-earth magnets, were investigated as a function of temperature via calorimetric measurements. Its standard entropy, Δ0TSm∘, was obtained from the molar heat capacity, Cp,m∘, at 2 − 850 K using Debye-Einstein spin-wave functions. The standard enthalpy of formation, ΔfHm∘, was determined by acid solution calorimetry to provide the standard Gibbs energy of formation ΔfGm∘(T) as a function of temperature. ΔfGm∘(T) is useful for Calphad phase diagram calculations. The magnetic moment was calculated by separating the spin and lattice vibration terms for Cp,m∘ via the Curie temperature of 594.1 K. The results agree with direct magnetization measurements and indicate that the Fe 3d magnetic moments magnetize Dy2Fe14B by aligning by an exchange interaction between the Dy 4f and Dy 5d and Fe 3d moments in a second-order phase transition. These findings will contribute to the design of magnetic materials.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
