Abstract
The dc conductivity, the dielectric constant and the dielectric loss at 100 kHz and 3·6 GHz, have been measured for samples of potassium nitrite and potassium nitrate over a wide range of temperature. The dc conductivity and the dielectric constant show anomalies at −13°C and 40°C in a crystal of KNO2 pulled from the melt. However, the dielectric anomaly at 40°C does not indicate a ferroelectric-paraelectric phase transition and the room temperature phase of KNO2 seems not to be ferroelectric. The dc conductivity, the dielectric constant and loss measured in a randomly oriented single crystal, grown from aqueous solution, and a sample prepared from a melt of potassium nitrate, show anomalies at about 130°C on heating, and at about 124°C and 108°C on cooling. The dc conductivity, dielectric constant and loss value of the two samples of KNO3 together with the frequency effect in a melt sample of KNO3 are reported.
Published Version
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