Electromechanical Properties of NaNO2 Single Crystals

Abstract
Resonance and antiresonance measurements have been made on NaNO2 single crystals. Temperature dependence of all piezoelectric constants and five elastic compliance coefficients has been investigated in the range from -50°C to 230°C. The piezoelectric constants d 21, d 22 and d 23 have values of the order 10-8 (cgs. esu.) at room temperature, and show pronounced peaks just below the Curie point. The constants d 34 and d 16 are of the order of, 10-8 (cgs. esu.), and are nearly independent of temperature. The remarkable fact is that d 22 and d 23 change their signs in passing 100°C. Elastic anomalies are observed near the Curie point. Some discussions are made in connection with the ferroelectric properties of NaNO2.

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