High temperature protonic conduction in Sr-doped NdPO4

Naoto Kitamura; Koji Amezawa; Yoichi Tomii; Naoichi Yamamoto

doi:10.2497/jjspm.49.856

High temperature protonic conduction in Sr-doped NdPO₄

Naoto Kitamura, Koji Amezawa, Yoichi Tomii, Naoichi Yamamoto

IMRAM - Division of Process and System Engineering

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Conductivities of undoped and 5mol% Sr-doped NdPO₄ were investigated with the dc four-probe method at temperatures from 500 to 925°C under various p(H₂O) and p(O₂). The conductivity of 5 mol% Sr-doped NdPO₄ was higher under wet than dry atmosphere though that of undoped NdPO₄ was almost independent of p(H₂O). The conductivity of 5 mol% Sr-doped NdPO₄ was lower under D₂O than H₂O containing atmosphere. These results indicated that NdPO₄ conducted protons under wet atmosphere by substituting Sr for Nd. Conductivity behavior of this material versus p(H₂O) or p(O₂) was discussed in terms of defect equilibrium. It was concluded that protons were dominant charge carriers at investigated temperatures though electron holes became to contribute slightly to the total conductivity with increasing temperature.

Original language	English
Pages (from-to)	856-860
Number of pages	5
Journal	Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume	49
Issue number	10
DOIs	https://doi.org/10.2497/jjspm.49.856
Publication status	Published - 2002 Oct

Keywords

Defect equilibrium
High temperature protonic conductor
Phosphate

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abstract = "Conductivities of undoped and 5mol% Sr-doped NdPO4 were investigated with the dc four-probe method at temperatures from 500 to 925°C under various p(H2O) and p(O2). The conductivity of 5 mol% Sr-doped NdPO4 was higher under wet than dry atmosphere though that of undoped NdPO4 was almost independent of p(H2O). The conductivity of 5 mol% Sr-doped NdPO4 was lower under D2O than H2O containing atmosphere. These results indicated that NdPO4 conducted protons under wet atmosphere by substituting Sr for Nd. Conductivity behavior of this material versus p(H2O) or p(O2) was discussed in terms of defect equilibrium. It was concluded that protons were dominant charge carriers at investigated temperatures though electron holes became to contribute slightly to the total conductivity with increasing temperature.",

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T1 - High temperature protonic conduction in Sr-doped NdPO4

AU - Kitamura, Naoto

AU - Amezawa, Koji

AU - Tomii, Yoichi

AU - Yamamoto, Naoichi

PY - 2002/10

Y1 - 2002/10

N2 - Conductivities of undoped and 5mol% Sr-doped NdPO4 were investigated with the dc four-probe method at temperatures from 500 to 925°C under various p(H2O) and p(O2). The conductivity of 5 mol% Sr-doped NdPO4 was higher under wet than dry atmosphere though that of undoped NdPO4 was almost independent of p(H2O). The conductivity of 5 mol% Sr-doped NdPO4 was lower under D2O than H2O containing atmosphere. These results indicated that NdPO4 conducted protons under wet atmosphere by substituting Sr for Nd. Conductivity behavior of this material versus p(H2O) or p(O2) was discussed in terms of defect equilibrium. It was concluded that protons were dominant charge carriers at investigated temperatures though electron holes became to contribute slightly to the total conductivity with increasing temperature.

AB - Conductivities of undoped and 5mol% Sr-doped NdPO4 were investigated with the dc four-probe method at temperatures from 500 to 925°C under various p(H2O) and p(O2). The conductivity of 5 mol% Sr-doped NdPO4 was higher under wet than dry atmosphere though that of undoped NdPO4 was almost independent of p(H2O). The conductivity of 5 mol% Sr-doped NdPO4 was lower under D2O than H2O containing atmosphere. These results indicated that NdPO4 conducted protons under wet atmosphere by substituting Sr for Nd. Conductivity behavior of this material versus p(H2O) or p(O2) was discussed in terms of defect equilibrium. It was concluded that protons were dominant charge carriers at investigated temperatures though electron holes became to contribute slightly to the total conductivity with increasing temperature.

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High temperature protonic conduction in Sr-doped NdPO₄

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Keywords

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