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Lattice parameter change in water vapor exposed Ba3Ca1.18Nb1.82O9−δ

✍ Scribed by T. Mono; T. Schober

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
325 KB
Volume
91
Category
Article
ISSN
0167-2738

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✦ Synopsis

The compound Ba,Ca,,,,Nb, ,,O,_, belongs to the class of high-temperature proton conductors (HTPCs) which absorb water vapor and become good proton conductors. Oxygen from the water molecule fills vacancies present in the dry state of the above HTPC and the two protons are incorporated in the electron cloud of two O-atoms. A positive linear lattice parameter change was demonstrated in this work when the dry compound was exposed to water vapor. The slope of (Aala)ln,+, was determined to be (3.76kO.10) X IO-*. Defect structure considerations also favor an increase in the lattice parameter when O-vacancies are filled. The experimentally observed increase is compared with that observed in metals when they are charged with hydrogen.

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