Abstract
Electrical conduction in lanthanum orthoborates LaBO3 with the orthorhombic aragonite-type structure (S. G.: Pnam) was investigated by using conductivity measurements under 0.4-5 kPa of p(H2O) and 0.01-100 kPa of p(O2) at 500-930°C. From humidity dependence and H/D isotope effect of the conductivity, it was found that LaBO3 exhibited dominantly protonic conduction under wet conditions by substituting Sr for La. Results of conductivity measurements under various p (H2O) and p(O2) suggested that the contribution of electron hole conduction became significant as temperature increased, p(O2) increased and p(H2O) decreased, although protonic conduction was estimated as predominant under the conditions used. The conductivities of the 1 mol% Sr-doped LaBO3 were 1 × 10-5 -2 × 10 -4 S cm-1 under moisturized conditions at 500-930°C. The conductivity behaviors as well as the conductivity values of the Sr-doped LaBO3 with the aragonite-type structure were quite similar to those of the acceptor-doped rare earth orthophosphates, indicating a similar proton conduction mechanism in these oxoacid salts.
Original language | English |
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Pages (from-to) | 575-579 |
Number of pages | 5 |
Journal | Solid State Ionics |
Volume | 175 |
Issue number | 1-4 |
DOIs | |
Publication status | Published - 2004 Nov 30 |
Externally published | Yes |
Event | Fourteenth International Conference on Solid State Ionics - Monterey, CA., United States Duration: 2003 Jun 22 → 2003 Jun 27 |
Keywords
- Aragonite
- LaBO
- Orthoborate
- Protonic conduction
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics