Abstract
The temperature dependence of the dielectric constant of opal containing dispersed sodium nitrate 
was measured in the temperature interval from 370 to 600 K. Features associated with the ferroelectric and melting - freezing phase transitions in sodium nitrite particles were observed. A low-temperature shift 
of the Curie point of 
compared to that of the bulk 
was found on cooling, and significant broadening (up to 
K) of the melting - freezing phase transition was observed. A giant enhancement of the dielectric constant (up to 
at 100 Hz) of was found at high temperatures, when the sodium nitrite particles melt, transforming to electrolytic drops.
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