Synthesis, optical properties, and oxide ionic transport features in Mn-Li-, Mn-Ru-, Mn-Ru-Li-codoped bismuth niobate pyrochlores

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-03-01 DOI:10.1016/j.ceramint.2024.12.412

M.S. Koroleva , N.F. Eremeev , E.M. Sadovskaya , V.A. Sadykov , I.V. Piir

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引用次数: 0

Abstract

For the first time, manganese bismuth niobates doped with Li and Ru atoms have been synthesized and investigated. The compositions Bi_1.5-xLi_xMn_0.75Nb_1.5-yRu_yO_7‒δ (x = 0, 0.1, 0.2; y = 0–0.5) are characterized by the pyrochlore structure. The distribution of dopants in the structure was determined by structural analysis and measurement of pycnometric density values. From the theoretical calculation and experimental optical data, the band gap (E_g) gradually decrease with Ru concentration. The mixed electron and oxygen conductivity was determined for the ceramics. Oxygen transport was investigated by temperature-programmed isotope exchange of oxygen (TPIE) with C¹⁸O₂ in a flow reactor and by experiments using an ion-blocked electrode. Oxygen diffusion activation starts at 200–250 °C for Ru-free compositions and at 50 °C for Ru-reach compounds, with oxygen transport numbers corresponding to t_ion = 0.2 and 0.7–0.8 at 400 °C, respectively. Electronic conductivity, moderate oxygen mobility (D∗ ∼ 10⁻¹²–10⁻¹¹ cm²/s at 700 °C), chemical compatibility with La_0.7Sr_0.3MnO₃ perovskite (up to 800 °C) make the obtained pyrochlores a potential component of composite cathode material for intermediate temperature SOFCs.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.