ELECTRICAL-CONDUCTIVITY AND RELATIVE PERMITTIVITY OF KHCO3

The electrical conductivity sigma and the relative permittivity (k) as function of temperature 300 K < T < 400 K are measured and presented for potassium hydrogen carbonate KHCO3. It seems likely that the compo und undergoes two structural phase transitions at almost-equal-to 318 and 365 K. The differential thermal analysis DTA and the thermogravime tric analysis TGA are performed in the same temperature range. The the rmogram confirms the existence of structural phase transitions, wherea s TGA indicates the absence of any loss in weight. The data are correl ated to the crystal structure and the arrangement of the molecules in the crystal including the hydrogen bonding dimers (HCO3)2(-2).