Mm. Mosaad et al., ELECTRICAL AND THERMAL-PROPERTIES OF AMMONIUM AND POTASSIUM OXALATES, Journal of materials science. Materials in electronics, 6(4), 1995, pp. 235-239
The d.c. electrical conductivity (sigma) and the relative permittivity
(epsilon) were accurately measured as a function of temperature in th
e range 300 < T < 450 K for ammonium oxalate monohydrate (AOX), (NH4)(
2) C2O4H2O and potassium oxalate monohydrate (POX), K2C2O4H2O. Differe
ntial thermal analysis (DTA), differential scanning calorimetry (DSC)
and thermogravimetric analysis (TGA) from 300 K up to 520 K were also
performed for each compound. The data of the electrical parameters com
bined with the DTA and/or DSC thermograms suggest the existence of a p
ossible change in the electrical conduction at 350 K for AOX and at 35
5 K for POX. Like most hydrogen-bonded molecules, the charge carriers
may be protons and the electrical conduction is therefore protonic. At
somewhat higher temperatures, dehydration and/or decomposition takes
place in each compound and is reflected as a sudden loss in weight in
the TGA plot.