et~t~l resistanc~ me~a~enm as a m~el~an bf wa= va~er ~s~re an0 lem~troturr ~,~ ~rnea ~. ~ ~#t ~i=~r I. ln~rMaOi0n 2. F, xp ~fimenm ~ r~u|t~ In eke f~me ~s a research devoted ~o line ~mdv o~ 2.LCempound~rel/arati~n new proton ~nducto~ that should oi~eraIe ia ~hc 200-4~)0"C range ~ ~lid ete~rol~es i~ fuel rolls, Th~ HTaWO~.HtO pha~ ~as prepared ~Mmg the elcctri~t ~nduetlx'ily of rue pytoehlore to[I]byionexr HTaWO~.xH~O (0~x~glJ ~vas invcstlgated [1].
N HCI from KTaWOe-H~O. P~liminary resales suggest eO two different coaduc-ti~ mechanisms for h?dregen ions: the fi~t at high 2.2. Apparatus temperature (1~-130'C) in which both a dasslcal ion-hopping model and a ph~on~isted t unnelling
The experimental set-up r to ~rc~ out the model can be ~ame.d, and the second at low tern-el~trt~l meas~ent~ at ~ wyn-ddlacd water-va-peralu~ ( T~ 130r ), not ~r welt defined, in ~hich por pressu~ is described in gvf. [ 2 ]. Changing the the pre~nce of wat~ molecules in the crystal st~ ratio bct~ecu the dry and the water va~or saturated tureofthematcriataplmarsto~h~the~leetiScal gas (air) t~e ~ount of ga~ous water in tile gas ~nduetivity substantiallg steam was ~nt~lled and its c~c~t~tion menin order *o characterize lhoroughly Ih~ r sured by an hygromelcr ~rking in -n01+90~C bebaviour of such py~chlore and to invesllgate tile temperature rage ~d in 0-100% F,H ~nge; the a~ ~le of ~ter mol~l~ in the conduction mecha-cur~y is • 20,6 and • 3% in 1~1e ~'-~0% RH and 80nism, detailed eleetfi~t r~islance measurements 10~AI RH ~ugcs, respectivel 7 The cell was placed we~ ~rried auk by complex impedan~ method, on in an air the~ostat reglllated at _+ 1 oC. volyet~staliine samples of the anhydrous and hydrated phase~ 2,3. Electrical conductivit~ measurements Elet rlcal conductivity meas~ents were carried o~t ou fl 13 mm 0alters, formed by ~mpaetin~ at