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Title: Cation interdiffusion and phase stability in polycrystalline tetragonal ceria-zirconia-hafnia solid solution

Abstract

This paper reports on Zr-Hf interdiffusions that were carried out at 1350{degrees} to 1520{degrees} C for polycrystalline tetragonal solid solutions of 14CeO{sub c} {center dot} 86(Zr{sub 1{minus}x}Hf{sub x})O{sub 2} with X = 0.02 and 0.10. Lattice and grain-boundary interdiffusion parameters were calculated from the concentration distributions by using Oishi and Ichimura's equation. Lattice interdiffusion coefficients were described by D = 3.0 {times} 10{sup 3} exp({minus}623 (kJ/mol)/RT) cm{sup 2}/s and grain-boundary interdiffusion parameters by {delta}D{prime} = 0.29 exp({minus}506 (kJ/mol)/RT) cm{sup 3}/s. The cation diffusivity was lower than the anion diffusivity. The results were compared with diffusivities in the fluorite-cubic solid solution. The critical grain radii for stabilization of the tetragonal phase in CeO{sub 2}-doped ZrO{sub 2} were 11 and 6 {mu}m for the solutions with 2 and 10 mol% HfO{sub 2} substitution, respectively, both of which are much greater than in the Y{sub 2}O{sub 3}-doped ZrO{sub 2} solid solution.

Authors:
; ; ;  [1]
  1. Kyushu Univ., Fukuoka (Japan). Faculty of Engineering
Publication Date:
OSTI Identifier:
5877420
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society; (United States)
Additional Journal Information:
Journal Volume: 74:10; Journal ID: ISSN 0002-7820
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERIUM OXIDES; PHASE STUDIES; HAFNIUM IONS; DIFFUSION; HAFNIUM OXIDES; ZIRCONIUM IONS; ZIRCONIUM OXIDES; CATIONS; GRAIN BOUNDARIES; GRAIN SIZE; POLYCRYSTALS; SOLID SOLUTIONS; STABILITY; TEMPERATURE RANGE 1000-4000 K; TETRAGONAL LATTICES; CERIUM COMPOUNDS; CHALCOGENIDES; CHARGED PARTICLES; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CRYSTALS; DISPERSIONS; HAFNIUM COMPOUNDS; IONS; MICROSTRUCTURE; MIXTURES; OXIDES; OXYGEN COMPOUNDS; RARE EARTH COMPOUNDS; REFRACTORY METAL COMPOUNDS; SIZE; SOLUTIONS; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS; 360202* - Ceramics, Cermets, & Refractories- Structure & Phase Studies; 360204 - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Sakka, Y, Oishi, Y, Ando, K, and Morita, S. Cation interdiffusion and phase stability in polycrystalline tetragonal ceria-zirconia-hafnia solid solution. United States: N. p., 1991. Web. doi:10.1111/j.1151-2916.1991.tb06808.x.
Sakka, Y, Oishi, Y, Ando, K, & Morita, S. Cation interdiffusion and phase stability in polycrystalline tetragonal ceria-zirconia-hafnia solid solution. United States. doi:10.1111/j.1151-2916.1991.tb06808.x.
Sakka, Y, Oishi, Y, Ando, K, and Morita, S. Tue . "Cation interdiffusion and phase stability in polycrystalline tetragonal ceria-zirconia-hafnia solid solution". United States. doi:10.1111/j.1151-2916.1991.tb06808.x.
@article{osti_5877420,
title = {Cation interdiffusion and phase stability in polycrystalline tetragonal ceria-zirconia-hafnia solid solution},
author = {Sakka, Y and Oishi, Y and Ando, K and Morita, S},
abstractNote = {This paper reports on Zr-Hf interdiffusions that were carried out at 1350{degrees} to 1520{degrees} C for polycrystalline tetragonal solid solutions of 14CeO{sub c} {center dot} 86(Zr{sub 1{minus}x}Hf{sub x})O{sub 2} with X = 0.02 and 0.10. Lattice and grain-boundary interdiffusion parameters were calculated from the concentration distributions by using Oishi and Ichimura's equation. Lattice interdiffusion coefficients were described by D = 3.0 {times} 10{sup 3} exp({minus}623 (kJ/mol)/RT) cm{sup 2}/s and grain-boundary interdiffusion parameters by {delta}D{prime} = 0.29 exp({minus}506 (kJ/mol)/RT) cm{sup 3}/s. The cation diffusivity was lower than the anion diffusivity. The results were compared with diffusivities in the fluorite-cubic solid solution. The critical grain radii for stabilization of the tetragonal phase in CeO{sub 2}-doped ZrO{sub 2} were 11 and 6 {mu}m for the solutions with 2 and 10 mol% HfO{sub 2} substitution, respectively, both of which are much greater than in the Y{sub 2}O{sub 3}-doped ZrO{sub 2} solid solution.},
doi = {10.1111/j.1151-2916.1991.tb06808.x},
journal = {Journal of the American Ceramic Society; (United States)},
issn = {0002-7820},
number = ,
volume = 74:10,
place = {United States},
year = {1991},
month = {10}
}