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Dilatometric and Dielectric Studies of Ferroelectric NaNO2 in the Vicinity of the Curie Temperature

In order to study the phase transitions of ferroelectric NaNO2 near the Curie temperature TC and the Néel temperature TN, the linear thermal expansions xi(i=a, b, c) and the dielectric constant ϵb of the single crystals were simultaneously measured. The formers were measured by means of a clip-type strain gauge dilatometer and the latter was measured on the frequency of 100 kHz by the temperature rate of change of 10 mK/min. The dc biasing field of 4 kV/m was intermittently applied for every other second in order to avoid the influence of ferroelectric domain existence. Each coefficient αi(i=a, b, c) of the linear thermal expansion showed some anomalies around the TC and a λ -type anomaly at the TN. No other evidence of a phase transition was found in the antiferroelectric phase between the TC and the TN except around the TC.