TY - JOUR
T1 - Protonic conduction in rare earth orthophosphates with the monazite structure
AU - Kitamura, N.
AU - Amezawa, K.
AU - Tomii, Y.
AU - Yamamoto, N.
N1 - Funding Information:
A part of this work was carried out under the financial supports by the Nippon Sheet Glass Foundation and by a Grant in Aid from the Japanese Ministry of Education, Culture, Sports, Science and Technology. Dr. H. Miyamoto and Mr. Y. Nishikawa at the Technology Research Institute of Osaka Prefecture, Japan, are acknowledged for their help on material preparation. The authors acknowledge Prof. Truls Norby at the Centre for Material Research, University of Oslo, Norway, for valuable discussion.
PY - 2003/9
Y1 - 2003/9
N2 - Electrical conduction in rare earth orthophosphates, LnPO4 (Ln=La, Pr, Nd and Sm), with the monazite structure (P21/n) was investigated by using conductivity measurements at 500-925 °C. From the conductivities of undoped and 1 mol% Sr-doped LnPO4 under wet (H 2O and D2O) and dry atmospheres, it was found that LnPO4 began to conduct protons under wet atmosphere by substituting Sr for Ln. The conductivity behavior of 1 mol% Sr-doped LnPO4 versus p(H2O) and p(O2) was discussed in terms of the defect equilibria. It was concluded that protonic conduction was dominant in the materials though electron holes contributed slightly to the total conductivity as temperature increased. All the 1 mol% Sr-doped LnPO4 investigated in this study exhibited similar electrical conduction regardless of rare earth element used.
AB - Electrical conduction in rare earth orthophosphates, LnPO4 (Ln=La, Pr, Nd and Sm), with the monazite structure (P21/n) was investigated by using conductivity measurements at 500-925 °C. From the conductivities of undoped and 1 mol% Sr-doped LnPO4 under wet (H 2O and D2O) and dry atmospheres, it was found that LnPO4 began to conduct protons under wet atmosphere by substituting Sr for Ln. The conductivity behavior of 1 mol% Sr-doped LnPO4 versus p(H2O) and p(O2) was discussed in terms of the defect equilibria. It was concluded that protonic conduction was dominant in the materials though electron holes contributed slightly to the total conductivity as temperature increased. All the 1 mol% Sr-doped LnPO4 investigated in this study exhibited similar electrical conduction regardless of rare earth element used.
KW - Defect equilibrium
KW - LaPO
KW - Monazite
KW - NdPOSmPO
KW - PrPO
KW - Protonic conduction
KW - Rare earth orthophosphate
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U2 - 10.1016/S0167-2738(03)00219-4
DO - 10.1016/S0167-2738(03)00219-4
M3 - Conference article
AN - SCOPUS:0141732220
SN - 0167-2738
VL - 162-163
SP - 161
EP - 165
JO - Solid State Ionics
JF - Solid State Ionics
T2 - 11th Cpnference on Solid (SSPC11)
Y2 - 27 August 2002 through 30 August 2002
ER -