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Comparative Investigation of the Specific Heat of KH 2 PO 4 (KDP) and KD 2 PO 4 (DKDP) Single Crystals
Author(s) -
Strukov B. A.,
Amin M.,
Kopchik V. A.
Publication year - 1968
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.19680270231
Subject(s) - specific heat , phase transition , electric field , crystal (programming language) , thermodynamics , chemistry , heat capacity , materials science , analytical chemistry (journal) , crystallography , physics , chromatography , quantum mechanics , computer science , programming language
The surplus entropy of the phase transition is measured for KH 2 PO 4 and KD 2 PO 4 crystals. The corresponding values are as follows: (0.69 ± 0.02) and (0.96 ± 0.08) for KDP and DKDP, respectively. The temperature dependence of the specific heat of DKDP shows that the phase transition in the crystal is of the first order. For the KDP crystals, the analytic form of the surplus specific heat is approximately Δ c σ, E ∼ ( T c – T ) −δ , δ = 0.51 ± 0.01. Theoretical estimates and experimental measurements are made of the effect of an electric field on the specific heat.