New fluorite-like lanthanum-europium molybdates with Nd5Mo3O16+δ-type structure

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-03-31 DOI:10.1016/j.jallcom.2025.180138

Tatiana S. Berezhnaya, Konstantin A. Chebyshev, Roman V. Kabanov

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Abstract

Phase relations in the La₂O₃ – Eu₂O₃ – MoO₃ ternary system were studied using polycrystalline samples obtained in air at 1250°C via solid-state reaction of metal oxides. The system contains a broad region of a cubic fluorite-like phase of lanthanum-europium molybdates, named LEMO, which is isostructural with Nd₅Mo₃O_16+δ. However, the homogeneity range of this phase is quite limited and occurs at a lower MoO₃ content compared to neodymium molybdate. The citrate method was applied for the synthesis of LEMO ceramic samples with a relative density of 98 %. The crystal structure of La_2.5Eu_2.5Mo_2.625O_15.75 was analyzed by the Rietveld refinement using powder XRD data. The analysis revealed structural features of this europium-containing fluorite-like molybdate, specifically the splitting of oxygen atomic positions in the octahedral voids within the fluorite structure. The fluorite-like molybdate samples exhibited high electrical conductivity, with the grain bulk contribution at about 10⁻² S/cm at 900°C, and intense red luminescence under near-UV and blue radiation.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.