Dielectric Properties of a New Ferroelectric, NaNH4SO4·2H2O, near Its Curie Temperature
1965 年 20 巻 6 号 p. 954-959
詳細
1965 年 20 巻 6 号 p. 954-959
Dielectric properties of a new ferroelectric, NaNH4SO4·2H2O, 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 (εc) above the Curie temperature follows the Curie-Weiss law, εc=ε0+C⁄(T−Tc), with a rather normal magnitude of the Curie-Weiss constant, C.
Two different shapes of εc vs T curves are observed and the result is discussed with the help of pyroelectric measurements.
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