Thermochemical charge generation in polymer-salt films as a function of temperature

Oxide material synthesis by combustion of organic-inorganic compositions

“…In particular, positive charges are formed in the PVA ammonium heptamolybdate-containing compositions, the negative are formed in the copper nitrate compositions [210]. The negative charge was observed in nitrate-polymer precursors intended for synthesis of superconducting YBa 2 Cu 3 O 7−δ .…”

“…Studies of polymer-salt compositions (PSC) revealed a phenomenon that can significantly affect the results of the oxide material synthesis, the effect of thermochemical precursor charge generation [209]. Initially, this phenomenon was explored in polymer-saline, primarily PVA-based films by heating them below the initial combustion temperature [209,210].…”

“…Initially, this phenomenon was explored in polymer-saline, primarily PVA-based films by heating them below the initial combustion temperature [209,210]. A clear demonstration of charges in the films which were homoelectrets in that case, i.e.…”

“…Such particles may be considered to be the ammonium molecules if the films include any salts of ammonium, water, H 2 O(−), nitrogen oxide (NO+), carbon dioxide, etc. Inter alia, the possibility of formation of particles with the "sticking" CO 3 (−) electron cannot be ruled out [210,211]. Therefore, the film charge depends on the nature of the outbound charged particles in each case, as the charge polarity may change during heating.…”

“…Consequently, the charge polarity can be determined by the predominantly occurring redox processes and Red/Ox potentials. Moreover, there is a possibility of such a phenomenon as mechanic electron emission out of polymeric materials [210,211] with decreased electron liberation, the tunneling phenomena are known to occur in these materials. When heated, the polymer saline films, as shown in [150,196], undergo significant changes, sometimes alternating, in their geometry, which can lead in particular to mechanical stresses.…”