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Electrical conductivity of polar dielectric monocrystal NaNO2 under temperature influence in vacuum
Russian version
Sorokin N. I. 1
1Shubnikov Institute of Crystallography “Crystallography and Photonics”, Russian Academy of Sciences, Moscow, Russia
Email: nsorokin1@yandex.ru
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Sodium nitrite crystals were obtained from a melt by the Kyropoulos technique. The temperature dependence of the direct-current electrical conductivity σdc(T) of NaNO2 single crystal (sp. gr. Im2m) oriented along the polar direction [010] (crystallographic axis b) was studied by impedance spectroscopy under conditions of temperature exposure in a vacuum of ~10-1 Pa. Impedance measurements were performed in three heating runs at 293-470 K. It was found that thermal exposure in a vacuum on a NaNO2 crystal leads to a change in the ionic mechanism of electrical conductivity to a semiconductor one. During the first heating, the ionic conductivity of the crystal is equal to 7·10-7 S/cm at 470 K. During the second and third heating, the conductometric data coincide with each other, the value of conductivity σdc increases by 70 times, reaching 5·10-5 S/cm at 470 K. The temperature dependence σdc(T) has a semiconductor character with an activation energy of electrotransfer of 81±2 meV. Keywords: sodium nitrite, functional materials, electrical conductivity, point defects.
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