The transported entropies of ions in solid state fluorides and beta-alumina
Book
·
OSTI ID:371952
- Univ. of Trondheim (Norway)
The technical relevance of reversible heat effects is discussed with reference to high temperature batteries and electrolysis systems. The transported entropies of Na{sup +} in solid state mixtures of NaF and Na{sub 3}AlF{sub 6} are presented. The transported entropies are S{sup *cry}{sub Na{sup +}} = 140 {+-} 7 J K{sup {minus}1} mol{sup {minus}1} for cryolite, S{sup *NaF}{sub Na{sup +}} = 81 {+-} 8 J K{sup {minus}1} mol{sup {minus}1} for sodium fluoride and S{sup *{beta}}{sub Na{sup +}} = 60 {+-} 5 J K{sup {minus}1} mol{sup {minus}1} for sodium {beta}{double_prime}-alumina at the temperature range 380--500 C. The value obtained for sodium in the solid cryolite is higher than transported entropy of Na{sup +} in other solid sodium conductors and makes the authors predict that the transported entropy for Na{sup +} in the molten electrolyte mixture for aluminum production is substantial, and that so are the reversible heat effects in the aluminum electrolysis cell.
- OSTI ID:
- 371952
- Report Number(s):
- CONF-960202--; ISBN 0-87339-312-0
- Country of Publication:
- United States
- Language:
- English
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