Electrical Resistance of Thoria

Contribution a l'étude des cathodes à la thorine

“…Cela semble indiquer la pr6sence d'une barriere de potentiel a la surface de la cathode (film superficiel), le coefficient de réf1exion 6tant plus grand pour les electrons lents [13]. 20 Zone de charge d'espace. -Une formule cln 2 type ie ==/t-(V2013 Vo) s'applique dans la zone de charge d'espace.…”

Study of the mass and charge transport in thoria

“…The electrical conductivity of thoria has also been investigated by a number of other authors (62)(63)(64)(65)(66)(67)(68)(69)(70), however these studies were conducted for purposes not closely related to the present investigation. In par ticular, these investigations (62)(63)(64)(65)(66)(67)(68)(69)(70) were conducted under conditions where the thermodynamic state of thoria was ill defined.…”

“…In all these investigations (62-70) the external pressure (which is nominally at 1 atm) and the temperature were reported; however, the importance of controlling P_ was completely ignored. Hence these studies (62)(63)(64)(65)(66)(67)(68)(69)(70) have "2 little pertinence to the present investigation and only the more well defined conductivity studies (43,57,60,61 ) From the limited observation of the n-type conduction at 1600°C, Bransky and Tallan (60) estimated the band gap energy of around 5 eV.…”

“…In par ticular, these investigations (62)(63)(64)(65)(66)(67)(68)(69)(70) were conducted under conditions where the thermodynamic state of thoria was ill defined. In order to…”

Study of the mass and charge transport in thoria

“…The electrical conductivity of thoria has also been investigated by a number of other authors (62)(63)(64)(65)(66)(67)(68)(69)(70), however these studies were conducted for purposes not closely related to the present investigation. In par ticular, these investigations (62)(63)(64)(65)(66)(67)(68)(69)(70) were conducted under conditions where the thermodynamic state of thoria was ill defined. In order to properly define the state of ThOg for conductivity studies, it is necessary to control the total external pressure, the temperature and the oxygen chemical potential with which the ThOg is equilibrated.…”