High temperature protonic conduction in Ca-doped YPO4

Koji Amezawa; Yoichi Tomii; Naoichi Yamamoto

doi:10.1016/S0167-2738(03)00223-6

High temperature protonic conduction in Ca-doped YPO₄

Koji Amezawa, Yoichi Tomii, Naoichi Yamamoto

IMRAM - Division of Process and System Engineering

Kyoto University

Research output: Contribution to journal › Conference article › peer-review

41 Citations (Scopus)

Abstract

Electrical conduction in Ca-doped YPO₄ with the tetragonal xenotime-type structure was investigated by using conductivity and thermoelectric power measurements under 0.4-8 kPa of p(H₂O) and 0.01-100 kPa of p(O₂) at 500-930 °C. The conductivity of the 3 mol% Ca-doped YPO₄ was 4×10^-6 to 2×10 ^-4 S cm^-1 in moisturized conditions at 500-930 °C. From humidity dependence and H/D isotope effect of the conductivity, it was found that YPO₄ exhibited protonic conduction in moisturized conditions by substituting Ca for Y. Results of conductivity and thermoelectric power measurements versus p(H₂O) and p(O₂) showed that protonic conduction in Ca-doped YPO₄ was rather dominant, and that contribution of other ions or electronic conduction to the total conductivity was regarded as negligible. The magnitude of H/D isotope effect was from 1.3 to 1.6 and the activation energy for the D₂O-treated sample was 0.03 eV higher than that for the H₂O-treated sample, indicating semiclassical behavior in the free proton-hopping process in the material.

Original language	English
Pages (from-to)	175-180
Number of pages	6
Journal	Solid State Ionics
Volume	162-163
DOIs	https://doi.org/10.1016/S0167-2738(03)00223-6
Publication status	Published - 2003 Sept
Event	11th Cpnference on Solid (SSPC11) - Guildford, United Kingdom Duration: 2002 Aug 27 → 2002 Aug 30

Keywords

Phosphate
Protonic conduction
Xenotime
YPO

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10.1016/S0167-2738(03)00223-6

Cite this

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title = "High temperature protonic conduction in Ca-doped YPO4",

abstract = "Electrical conduction in Ca-doped YPO4 with the tetragonal xenotime-type structure was investigated by using conductivity and thermoelectric power measurements under 0.4-8 kPa of p(H2O) and 0.01-100 kPa of p(O2) at 500-930 °C. The conductivity of the 3 mol% Ca-doped YPO4 was 4×10-6 to 2×10 -4 S cm-1 in moisturized conditions at 500-930 °C. From humidity dependence and H/D isotope effect of the conductivity, it was found that YPO4 exhibited protonic conduction in moisturized conditions by substituting Ca for Y. Results of conductivity and thermoelectric power measurements versus p(H2O) and p(O2) showed that protonic conduction in Ca-doped YPO4 was rather dominant, and that contribution of other ions or electronic conduction to the total conductivity was regarded as negligible. The magnitude of H/D isotope effect was from 1.3 to 1.6 and the activation energy for the D2O-treated sample was 0.03 eV higher than that for the H2O-treated sample, indicating semiclassical behavior in the free proton-hopping process in the material.",

keywords = "Phosphate, Protonic conduction, Xenotime, YPO",

author = "Koji Amezawa and Yoichi Tomii and Naoichi Yamamoto",

note = "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. The authors thank Prof. T. Norby at Centre for Material Research, University of Oslo, Norway, for discussion. Dr. H. Miyamoto and Mr. Y. Nishikawa at the Technology Research Institute of Osaka Prefecture, Japan, are acknowledged for their help on material preparation.; 11th Cpnference on Solid (SSPC11) ; Conference date: 27-08-2002 Through 30-08-2002",

year = "2003",

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doi = "10.1016/S0167-2738(03)00223-6",

language = "English",

volume = "162-163",

pages = "175--180",

journal = "Solid State Ionics",

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TY - JOUR

T1 - High temperature protonic conduction in Ca-doped YPO4

AU - Amezawa, Koji

AU - Tomii, Yoichi

AU - Yamamoto, Naoichi

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. The authors thank Prof. T. Norby at Centre for Material Research, University of Oslo, Norway, for discussion. Dr. H. Miyamoto and Mr. Y. Nishikawa at the Technology Research Institute of Osaka Prefecture, Japan, are acknowledged for their help on material preparation.

PY - 2003/9

Y1 - 2003/9

N2 - Electrical conduction in Ca-doped YPO4 with the tetragonal xenotime-type structure was investigated by using conductivity and thermoelectric power measurements under 0.4-8 kPa of p(H2O) and 0.01-100 kPa of p(O2) at 500-930 °C. The conductivity of the 3 mol% Ca-doped YPO4 was 4×10-6 to 2×10 -4 S cm-1 in moisturized conditions at 500-930 °C. From humidity dependence and H/D isotope effect of the conductivity, it was found that YPO4 exhibited protonic conduction in moisturized conditions by substituting Ca for Y. Results of conductivity and thermoelectric power measurements versus p(H2O) and p(O2) showed that protonic conduction in Ca-doped YPO4 was rather dominant, and that contribution of other ions or electronic conduction to the total conductivity was regarded as negligible. The magnitude of H/D isotope effect was from 1.3 to 1.6 and the activation energy for the D2O-treated sample was 0.03 eV higher than that for the H2O-treated sample, indicating semiclassical behavior in the free proton-hopping process in the material.

AB - Electrical conduction in Ca-doped YPO4 with the tetragonal xenotime-type structure was investigated by using conductivity and thermoelectric power measurements under 0.4-8 kPa of p(H2O) and 0.01-100 kPa of p(O2) at 500-930 °C. The conductivity of the 3 mol% Ca-doped YPO4 was 4×10-6 to 2×10 -4 S cm-1 in moisturized conditions at 500-930 °C. From humidity dependence and H/D isotope effect of the conductivity, it was found that YPO4 exhibited protonic conduction in moisturized conditions by substituting Ca for Y. Results of conductivity and thermoelectric power measurements versus p(H2O) and p(O2) showed that protonic conduction in Ca-doped YPO4 was rather dominant, and that contribution of other ions or electronic conduction to the total conductivity was regarded as negligible. The magnitude of H/D isotope effect was from 1.3 to 1.6 and the activation energy for the D2O-treated sample was 0.03 eV higher than that for the H2O-treated sample, indicating semiclassical behavior in the free proton-hopping process in the material.

KW - Phosphate

KW - Protonic conduction

KW - Xenotime

KW - YPO

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DO - 10.1016/S0167-2738(03)00223-6

M3 - Conference article

AN - SCOPUS:0141483704

SN - 0167-2738

VL - 162-163

SP - 175

EP - 180

JO - Solid State Ionics

JF - Solid State Ionics

T2 - 11th Cpnference on Solid (SSPC11)

Y2 - 27 August 2002 through 30 August 2002

ER -

High temperature protonic conduction in Ca-doped YPO₄

Abstract

Keywords

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