Discovery of Ba7Nb4MoO20-Based Materials and the Mechanism of Ultrafast Ion Conduction Via Dimers

By: Yuichi Sakuda

Write A Review

eText | 26 March 2025

At a Glance

Format
ePUB

eText

$299.00

or 4 interest-free payments of $74.75 with

Instant online reading in your Booktopia eTextbook Library *

Read online on

Desktop

Tablet

Mobile

Not downloadable to your eReader or an app

Why choose an eTextbook?

Instant Access *

Purchase and read your book immediately

Read Aloud

Listen and follow along as Bookshelf reads to you

Study Tools

Built-in study tools like highlights and more

* eTextbooks are not downloadable to your eReader or an app and can be accessed via web browsers only. You must be connected to the internet and have no technical issues with your device or browser that could prevent the eTextbook from operating.

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.