Anomalies of thermal expansion and change of entropy of rare‐earth diborides at the temperatures of magnetic transitions | Zendy

Novikov Vladimir | Zendy; Chukina Tatiana | Zendy

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Anomalies of thermal expansion and change of entropy of rare‐earth diborides at the temperatures of magnetic transitions

Author(s) -

Novikov Vladimir,

Chukina Tatiana

Publication year - 2011

Publication title -

physica status solidi (b)

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.51

H-Index - 109

eISSN - 1521-3951

pISSN - 0370-1972

DOI - 10.1002/pssb.201083968

Subject(s) - thermal expansion , diffraction , thermodynamics , heat capacity , specific heat , entropy (arrow of time) , thermal , rare earth , materials science , condensed matter physics , lattice (music) , physics , optics , metallurgy , acoustics

An entropy method has been proposed for calculating magnetic heat capacity C m of rare‐earth diborides on their thermal expansion data. It was found that the temperature changes of magnetic entropy Δ S m ( T ) calculated from calorimetric data correlate with the magnetic components of lattice parameters Δ a m ( T ) and Δ c m ( T ) calculated from X‐ray diffraction data. Using this correlation, a formula for C m ( T ) has been derived. Calculations of C m ( T ) for TbB 2 , DyB 2 , HoB 2 , and ErB 2 have been carried out. The temperature dependencies C m ( T ) obtained from X‐ray diffraction data are in a good agreement with the calorimetric data.

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