Structural, mechanical and luminescence characteristics of gadolinium orthoniobate-tantalates doped with Tb, Er and Eu

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-03-14 DOI:10.1016/j.optmat.2025.116950

M.N. Palatnikov, O.B. Shcherbina, M.V. Smirnov, S.M. Masloboeva

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引用次数: 0

Abstract

Powders of gadolinium orthoniobate-tantalate doped by terbium, erbium and europium with the general formula Gd_0.979Tb_0.01Er_0.01Eu_0.001Nb_xТа_1-xO₄ (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1) were synthesized by liquid-phase method. The influence of composition of Gd_0.979Tb_0.01Er_0.01Eu_0.001Nb_xТа_1-xO₄ ceramics on structural, mechanical and luminescence properties was studied. The structural parameters of the main phase of Gd_0.979Tb_0.01Er_0.01Eu_0.001Nb_xТа_1-xO₄ ceramics were calculated. The main phases of samples had the structure of monoclinic β-fergusonite. Increasing Ta content in obtained samples led to appearing a small amount (3–4 %) of orthorhombic phase Gd_0.333TaO₃. The morphological features of microstructure of ceramic samples were studied and their mechanical characteristics were evaluated. It was shown that Gd_0.979Tb_0.01Er_0.01Eu_0.001Nb_0.7Ta_0.3O₄ had the best mechanical characteristics. The study of photoluminescent properties of Gd_0.979Tb_0.01Er_0.01Eu_0.001Nb_xТа_1-xO₄ ceramics had shown that isomorphic substitution in the niobium-tantalum sublattice led to positional disorder of cations in the B-sublattice, which stimulated luminescence of rare-earth elements particularly Tb³⁺ cations. Thus, in Gd_0.979Tb_0.01Er_0.01Eu_0.001Nb_xТа_1-xO₄ ceramics there was a special concentration point (Nb:Ta = 1) at which the luminescence intensity was maximal. It was shown that as the Nb content decreased in the structure of Gd_0.979Tb_0.01Er_0.01Eu_0.001Nb_xТа_1-xO₄ ceramics the value of charge transfer energy between intrinsic luminescence centers and doped elements increased as well as splitting of multiplets into Stark levels increased due to the change of both distance between Me-Re (Me – Ta, Nb; Re – Tb, Er, Eu) and polarisation of ReO₈ polyhedron.

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.