Temperature and frequency dependence of piezoelectric and electrostrictive properties of AgNa(NO2)2

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Abstract
By the use of a quasi-static method the complex piezoelectric constant d22 of AgNa(NO2)2 has been measured over a temperature range -100°C ∼ 38°C and a frequency range 10 Hz ∼ 20 kHz. It was found that d22 shows a dispersion of Debye type, d22 =d∞ + (do - d∞)/(1 + iwr), where the relaxation time τ coincides with that of dielectric dispersion. While d∞ (3 × 10−8 cgsesu) remains positive and nearly temperature independent, the second term is negative and strongly temperature dependent. The magnitudes of the two terms become equal at - 40°C and the static piezoelectric constant changes its sign there. The electrostrictive constant Q22 was found to be -5 × 10−12 cgsesu.

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