Electrical and calorimetric properties of sodium hydrogen tartrate monohydrate

This report considers some electrical parameters (dielectric constant and resistivity) and some calorimetric properties (thermal heat capacity, thermal conductivity and thermal diffusivity) as well as the DTA thermogram in the temperature range 30 < T < 140°C of sodium hydrogen tartrate monohydrate, NaHC4H4O6·H2O (SHTMHD). The accurate measurements of these parameters have revealed the presence of a structural phase transition at about 83°C, in addition to the phase transformation that results from the loss of water (dehydration). The data are correlated to the restricted rotation of the tartrate ions as well as to the hydrogen bonding scheme.