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Isothermal electrocaloric effect in KCI:OH
Author(s) -
Korrovits V.,
Liidja G.,
Mihkelsoo V.
Publication year - 1975
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.2220670232
Subject(s) - electric field , dipole , electrocaloric effect , isothermal process , electric dipole moment , condensed matter physics , crystal (programming language) , lattice (music) , materials science , physics , optics , thermodynamics , quantum mechanics , computer science , dielectric , ferroelectricity , programming language , acoustics
The entropy of a noninteracting dipole system with the equilibrium dipole moment μ ‖ 〈100〉 in a rigid cubic lattice is obtained for the external electric field E ‖ [100] of arbitrary strength, taking into account the 90° tunneling. In thermostating experiments the KCI‐OH monocrystals were illuminated with light pulses of rectangular shape (single 10 −2 s shots, absorbed power ranging 3 × 10 3 erg/s cm 3 ) and the electric field applied to the crystal was simultaneously removed. The electric field pulse shape, needed for maintaining the crystal temperature constant within some millidegrees at 0.75 K, is close to the theoretical one assuming a “working” dipole number N E ≈ 0.1 N opt .