Drelectric Properties of a New Ferroelectric, NaNH_4SO_4・2H_2O, near Its Curie Temperature

概要

論文の詳細を見る
Dielectric properties of a new ferroelectric, NaNH_4SO_4・2H_2O, near its Curie temperature are studied. The crystal has three successive phases, i.e. a ferroelectric (III), another ferroelectric (II), and a paraelectric phase (I). The II-III phase transition is accompanied with a small discontinuous change in spontaneous polarization. The dielectric constant along the c axis (ε_c.) above the Curie temperature follows the Curie.Weiss law, ε_c=ε_0+C/(T-T_c), with a rather normal magnitude of the Curie-Weiss constant, C. Two different shapes of ε_c vs T curves are observed and the result is discussed with the help of pyroelectric measurements.
社団法人日本物理学会の論文
1965-06-05