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Chemical Expansion and Change in Lattice Constant of Y‐Doped BaZrO 3 by Hydration/Dehydration Reaction and Final Heat‐Treating Temperature
Author(s) -
Hiraiwa Chihiro,
Han Donglin,
Kuramitsu Akiko,
Kuwabara Akihide,
Takeuchi Hisao,
Majima Masatoshi,
Uda Tetsuya
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12172
Subject(s) - lattice constant , sintering , materials science , electrolyte , thermal expansion , dehydration , doping , chemical engineering , x ray crystallography , analytical chemistry (journal) , diffraction , chemistry , composite material , organic chemistry , biochemistry , physics , optoelectronics , electrode , optics , engineering
Knowledge of thermal behavior of electrolyte is important for fuel cell fabrication. In this study, using high‐temperature X ‐ray diffraction analysis ( HT ‐ XRD ) and thermo‐mechanical analysis ( TMA ), a systematic investigation of lattice constants was performed on Y‐doped BaZrO 3 , which is a promising candidate for electrolyte in protonic ceramic fuel cells. The results revealed that a chemical expansion was observed between 300°C and 450°C during the heating process in HT ‐ XRD , and was attributed to the dehydration of BZY . Furthermore, it was found that the lattice constants of the samples doped with Y, Sm, Eu, and Dy were larger for the ones finally heat‐treated at 1600°C for sintering than those heat‐treated at 1300°C for synthesizing. The similar behavior was not observed in Sc‐doped samples.