Electrical Properties of NaNO<SUB>2</SUB> Single Crystal in the Vicinity of the Ferroelectric Curie Temperature

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  • Electrical properties of NaNO2 single crystal in the vicinity of the ferroelectric Curie temperature

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Abstract

Temperature dependence of the dielectric constant and the d.c. electrical resistivity of single crystals of NaNO2 were measured in the vicinity of the ferroelectric Curie point under precise control of temperature. Anomalies in the dielectric constant ε22 and the resistivity ρ22 are seen at 163.8°C (the Curie point of ferroelectric-to-sinusoidal phase transition), at 165.0°C (the Néel point of sinusoidal-to-paraelectric phase transition) and at about 178°C. The reciprocal of the dielectric constant 1/ε22 is not linear against the temperature in the paraelectric phase just above the Néel point but is proportional to (T⁄θ0−1)γ together with θ0=431.6K and γ=1.75. A phenomenological description of the dielectric constant and the effect of the short range order are briefly discussed.

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