Substitution of praseodymium for cadmium and lead in the Pr 5 Mo 3 O 16+δ  structure

А. О. Sidorenko; Сидоренко А. О.; Т. S. Berezhnaya; Бережная Т. С.; L. V. Pasechnik; Пасечник Л. В.; I. Y. Ukleina; Уклеина И. Ю.; A. V. Guseva; Гусева А. В.; K. А. Chebyshev; Чебышев К. А.

doi:10.31857/S0044457X25050047

Substitution of praseodymium for cadmium and lead in the Pr₅Mo₃O_16+δ structure

作者: Sidorenko А.О.¹, Berezhnaya Т.S.², Pasechnik L.V.¹, Ukleina I.Y.², Guseva A.V.², Chebyshev K.А.²
隶属关系:
1. Donetsk State University
2. North-Caucasus Federal University
期: 卷 70, 编号 5 (2025)
页面: 652-659
栏目: СИНТЕЗ И СВОЙСТВА НЕОРГАНИЧЕСКИХ СОЕДИНЕНИЙ
URL: https://vietnamjournal.ru/0044-457X/article/view/685466
DOI: https://doi.org/10.31857/S0044457X25050047
EDN: https://elibrary.ru/HYBWTJ
ID: 685466

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Solid solutions based on fluorite-like phase in systems Pr_5–xMe_xMo₃O_16+δ, where Me = Cd, Pb, were obtained by solid-phase synthesis from metal oxides. The phase content after calcination at 1000°C was studied by X-ray diffraction, the substitution limits and the dependences of the unit cell parameter on the composition of the systems were determined. The parameters of the crystal structure of solid solutions were specified by the Rietveld method. The influence of magnesium oxide additives on the sinterability of cadmium-containing solid solutions has been established. Isomorphous substitution of praseodymium by lead and cadmium leads to a decrease in the conductivity value of the samples in the studied systems.

关键词

isomorphic substitutions, praseodymium molybdate, Nd₅Mo₃O_16+δ structure, heterovalent substitutions, electrical conductivity

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作者简介

А. Sidorenko

Donetsk State University

Email: chebyshev.konst@mail.ru
俄罗斯联邦, Donetsk, 283001

Т. Berezhnaya

North-Caucasus Federal University

Email: chebyshev.konst@mail.ru
俄罗斯联邦, Stavropol, 355017

L. Pasechnik

Donetsk State University

Email: chebyshev.konst@mail.ru
俄罗斯联邦, Donetsk, 283001

I. Ukleina

North-Caucasus Federal University

Email: chebyshev.konst@mail.ru
俄罗斯联邦, Stavropol, 355017

A. Guseva

North-Caucasus Federal University

Email: chebyshev.konst@mail.ru
俄罗斯联邦, Stavropol, 355017

K. Chebyshev

North-Caucasus Federal University

编辑信件的主要联系方式.
Email: chebyshev.konst@mail.ru
俄罗斯联邦, Stavropol, 355017

参考

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2. Fig. 1. Diffraction patterns of samples of the Pr_5–xM_xMo₃O_16+δ systems, where M = Pb (a), Cd (b), at 1000°C: x = 0 (1), 0.1 (2), 0.3 (3), 0.5 (4), 0.7 (5), 1.0 (6), 1.2 (7), 1.5 (8). Miller indices apply to solid solutions based on Pr₅Mo₃O_16+δ (a) and CdMoO₄ (b).

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3. Fig. 2. Dependences of the unit cell parameter of the phase with the Pr₅Mo₃O_16+δ structure on the composition of the Pr_5–xM_xMo₃O_16+δ systems: 1 – M = Pb, 2 – M = Cd, 3 – Pr₄PbMo₃O₁₆ [20], 4 – Pr₄CdMo₃O₁₆ [20].

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4. Fig. 3. Electrical conductivity of samples of the Pr_5–xPb_xMo₃O_16+δ system (a): x = 0 (1), 0.1 (2), 0.3 (3), 0.5 (4), 0.7 (5), 1.0 (6). Dependences of the logarithm of electrical conductivity at 700°C (1) and activation energy (2) on the composition of the system (b).

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5. Fig. 4. Electrical conductivity of samples of the Pr_5–xCd_xMo₃O_16+δ system (a): x = 0 (1), 0.1 (2), 0.3 (3), 0.5 (4), 0.7 (5), 1.0 (6). Dependences of the logarithm of electrical conductivity at 700°C (1) and activation energy (2) on the composition of the system (b).

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6. Fig. S1. Dependences of the intensity of the reflection of the impurity phase at 31.3°2Θ in the Pr_5–xPb_xMo₃O_16+δ system (1) and the reflection (112) of the CdMoO₄ phase (2) in the Pr_5–xCd_xMo₃O_16+δ system on the content of the divalent element.

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7. Рис. S2. Дифрактограммы образцов системы Pr_4.3Cd_0.7Mo₃O_16+δ·yMgO (а): y = 0 (1), y = 0.025 (2), y = 0.05 (3), y = 0.075 (4), y = 0.1 (5). Зависимость относительной плотности образцов после спекания при 1000°С (б).