TY - JOUR
T1 - High temperature protonic conduction in LaBO3 with the aragonite-type structure
AU - Amezawa, Koji
AU - Takahashi, Nobuyuki
AU - Kitamura, Naoto
AU - Tomii, Yoichi
AU - Yamamoto, Naoichi
N1 - Funding Information:
A part of this work was carried out under the financial supports by a Grant in Aid from the Japanese Ministry of Education, Culture, Sports, Science and Technology. The authors thank Dr. H. Miyamoto and Mr. Y. Nishikawa at the Technology Research Institute of Osaka Prefecture, Japan for their help on material preparation.
PY - 2004/11/30
Y1 - 2004/11/30
N2 - 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.
AB - 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.
KW - Aragonite
KW - LaBO
KW - Orthoborate
KW - Protonic conduction
UR - http://www.scopus.com/inward/record.url?scp=10044281793&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=10044281793&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2004.02.079
DO - 10.1016/j.ssi.2004.02.079
M3 - Conference article
AN - SCOPUS:10044281793
VL - 175
SP - 575
EP - 579
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
IS - 1-4
T2 - Fourteenth International Conference on Solid State Ionics
Y2 - 22 June 2003 through 27 June 2003
ER -