Protonic conduction in LaPO4-based ceramics

Koji Amezawa

doi:10.2497/jjspm.46.207

Protonic conduction in LaPO₄-based ceramics

Koji Amezawa

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

1 Citation (Scopus)

Abstract

Significant protonic conduction has been found at high temperature in LaPO₄-based ceramics, in which protons are considered to dissolve as defects in the presence of hydrogen-containing gases. This report describes electrolyte properties of 5mol% Sr-substituted LaPO₄. In air, this material can be regarded as a pure protonic conductor at 600°C when P_H(2)O > 1kPa, and at 700°C when P_H(2)O > 3kPa. At high temperature, low P_H(2)O, and high P_O(2), the material shows mixed conduction by protons and electron holes. The contribution of electron hole conduction to the total conductivity becomes significant as temperature increases, P_O(2) increases, and P_H(2)O decreases, although protonic conduction is still dominant even at 900°C in wet air.

Original language	English
Pages (from-to)	207-211
Number of pages	5
Journal	Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume	46
Issue number	3
DOIs	https://doi.org/10.2497/jjspm.46.207
Publication status	Published - 1999 Mar
Externally published	Yes

ASJC Scopus subject areas

Mechanical Engineering
Industrial and Manufacturing Engineering
Metals and Alloys
Materials Chemistry

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abstract = "Significant protonic conduction has been found at high temperature in LaPO4-based ceramics, in which protons are considered to dissolve as defects in the presence of hydrogen-containing gases. This report describes electrolyte properties of 5mol% Sr-substituted LaPO4. In air, this material can be regarded as a pure protonic conductor at 600°C when PH(2)O > 1kPa, and at 700°C when PH(2)O > 3kPa. At high temperature, low PH(2)O, and high PO(2), the material shows mixed conduction by protons and electron holes. The contribution of electron hole conduction to the total conductivity becomes significant as temperature increases, PO(2) increases, and PH(2)O decreases, although protonic conduction is still dominant even at 900°C in wet air.",

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