Spontaneous Polarization Measurement in NaNo_2
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概要
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Spontaneous polarization of NaNO_2 was determined by reversing P_s with a relatively low dc field of from 60V/cm to 12kV/cm and measuring the polarization reversal charge with an electrometer and a recorder. A clear jump in P_s of 5.8μC/cm^2 was observed at the Curie point T_c. The dielectric constant ε_<22> in the ferroelectric phase obeys the Curie-Weiss law very well over a wide temperature range and P_s is proportional to (1-T/T_0)^<0.20±0.02> over 25℃ below T_c, where T_0 is the ferroelectric Curie-Weiss temperature. Below room temperature P_s does not vary appreciably. The saturation polarization is estimated to be 11.9μC/cm^2. The electronic contribution to P_s is discussed on the basis of a point-dipole approximation. It is probable that about one third of the total spontaneous polarization is contributed from the electronic polarization. The experimental technique is described in detail.
- 社団法人日本物理学会の論文
- 1973-07-05
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