Discovery of Ba7Nb4MoO20-Based Materials and the Mechanism of Ultrafast Ion Conduction Via Dimers
Series: Springer Theses;
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Product details:
- Publisher Springer Nature Singapore
- Date of Publication 27 March 2025
- Number of Volumes 1 pieces, Book
- ISBN 9789819625512
- Binding Hardback
- No. of pages99 pages
- Size 235x155 mm
- Language English
- Illustrations X, 99 p. 67 illus., 62 illus. in color. Illustrations, black & white 599
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Long description:
This book provides detailed descriptions of strategies for improving ion conductivity and the factors that result in high ion conductivity.
In this book, discovery of novel materials that exhibit higher ion conductivity than practical materials is introduced to clarify the migration mechanism of oxide ions and protons.
The book shows that the bulk conductivity of hexagonal perovskite-related oxide Ba7Nb3.8Mo1.2O20.1 in dry air is 1.1 mS/cm at 306 °C, which is 175 times higher than that of practical materials (ZrO2)0.92(Y2O3)0.08 (8YSZ). Also, as a new approach to the subject, by ab initio molecular dynamics (AIMD) simulations and neutron-diffraction experiments, the mechanism is shown that the oxide ions migrate by the breaking and reforming of M2O9 (M = Nb, Mo) dimers, MO5 monomers and MO4 tetrahedra. The oxide-ion migration is reminiscent of a concerted push-pull interstitialcy ‘bucket-relay’-type motions. Readers can understand the oxide-ion and proton migration mechanism in terms of crystal structure.
Recently, materials that exhibit high ionic conductivity have been discovered one after another.
MoreTable of Contents:
Introduction.- Improvement of oxide-ion conductivity and suppression of proton conduction by Cr6+ doping in Ba7Nb4MoO20-based materials.- Dimer mediated cooperative mechanism of ultrafast-ion conduction in hexagonal perovskite-related oxides.- Summary.
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