Thermal Expansion in NaNO2 Crystals
1965 年 20 巻 5 号 p. 811-816
詳細
1965 年 20 巻 5 号 p. 811-816
The anisotropy and the temperature dependence of thermal expansion in NaNO2 crystals were investigated over a temperature range from room temperature to near the melting point by a differential type dilatometer.
The anomaly of thermal expansion coefficients was recognized at 102°C, near the Curie point (163°C), and at 178°C, 189°C and 207°C respectively. The plots of the α−1 vs T relation are on straight lines in the whole temperature range except for that from 102°C to 207°C in the [100] and [010] directions, though the similar linear relation exists only above 178°C in the [001] direction. These three straight lines extrapolated to the high temperature side terminate together at a point, whose temperature is higher than the melting point by a few degrees.
Obtained experimental results were discussed qualitatively in relation to the thermal motion of NO2− radicals.
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