Dielectric Critical Slowing-Down in Ferroelectric (CH₃NHCH₂COOH)₃·CaCl₂

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Complex dielectric constants of (CH₃NHCH₂COOH)₃·CaCl₂ and (CH₃NDCH₂COOD)₃·CaCl₂ have been measured. between 10⁴ Hz and 10⁹ Hz in the Curie temperature region. No appreciable isotope effect was found in the complex dielectric constants as well as in the Curie temperature. Dielectric dispersion of the Debye type which showed a critical slowing-down was observed above about 100 MHz. Discussion was made of the relation between the observed critical slowing-down and the softening of the optical phonon reported previously.