Hydration and conduction behavior of Sc and Zr-substituted Ba7Nb4MoO20

IF 3.3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2025-09-16 DOI:10.1016/j.ssi.2025.117027

Sara Adeeba Ismail , Lulu Jiang , Hui Guo , Wenhao Li , Donglin Han

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引用次数: 0

Abstract

Ba₇Nb₄MoO₂₀ has acceptably high ionic conductivity at 600–800 °C and is attractive for potential application in high temperature solid state electrochemical devices. Up to now, most of the research focuses on isovalent and donor-doping to improve the electrical properties of Ba₇Nb₄MoO₂₀. In this work, an acceptor-doping strategy was taken by doping Sc and Zr to partially substitute Nb. More vacant oxygen sites thereby form for charge compensation, leading to the increasing proton concentration following the compositional sequence of hydrated Ba₇Nb₄MoO₂₀ < Ba₇Nb_3.97Zr_0.03MoO_19.985 < Ba₇Nb_3.97Sc_0.03MoO_19.97. Notably, both the H₂O/D₂O isotope effect and EMF measurements indicate that the proton conduction – if there is any – is negligibly small, and the Sc and Zr-doped Ba₇Nb₄MoO₂₀ is essentially an oxide ion conductor in the temperature range studied in this work.

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Sc和zr取代Ba7Nb4MoO20的水化和导电行为

Ba7Nb4MoO20在600-800°C具有可接受的高离子电导率，在高温固态电化学器件中具有潜在的应用前景。目前，为了改善Ba7Nb4MoO20的电学性能，大部分的研究都集中在同价掺杂和给体掺杂上。在这项工作中，采用了一种受体掺杂策略，通过掺杂Sc和Zr来部分取代Nb。从而形成更多的空氧位进行电荷补偿，导致质子浓度按照水合Ba7Nb4MoO20 <； Ba7Nb3.97Zr0.03MoO19.985 < Ba7Nb3.97Sc0.03MoO19.97的组成顺序递增。值得注意的是，H2O/D2O同位素效应和EMF测量都表明，质子传导-如果有的话-是可以忽略不计的小，并且Sc和zr掺杂的Ba7Nb4MoO20在本工作研究的温度范围内基本上是氧化物离子导体。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.