Substitution of praseodymium for cadmium and lead in the Pr5Mo3O16+δ structure

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Abstract

Solid solutions based on fluorite-like phase in systems Pr5–xMexMo3O16+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.

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About the authors

А. О. Sidorenko

Donetsk State University

Email: chebyshev.konst@mail.ru
Russian Federation, Donetsk, 283001

Т. S. Berezhnaya

North-Caucasus Federal University

Email: chebyshev.konst@mail.ru
Russian Federation, Stavropol, 355017

L. V. Pasechnik

Donetsk State University

Email: chebyshev.konst@mail.ru
Russian Federation, Donetsk, 283001

I. Y. Ukleina

North-Caucasus Federal University

Email: chebyshev.konst@mail.ru
Russian Federation, Stavropol, 355017

A. V. Guseva

North-Caucasus Federal University

Email: chebyshev.konst@mail.ru
Russian Federation, Stavropol, 355017

K. А. Chebyshev

North-Caucasus Federal University

Author for correspondence.
Email: chebyshev.konst@mail.ru
Russian Federation, Stavropol, 355017

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Supplementary files

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2. Fig. 1. Diffraction patterns of samples of the Pr5–xMxMo3O16+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 Pr5Mo3O16+δ (a) and CdMoO4 (b).

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3. Fig. 2. Dependences of the unit cell parameter of the phase with the Pr5Mo3O16+δ structure on the composition of the Pr5–xMxMo3O16+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 Pr5–xPbxMo3O16+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 Pr5–xCdxMo3O16+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 Pr5–xPbxMo3O16+δ system (1) and the reflection (112) of the CdMoO4 phase (2) in the Pr5–xCdxMo3O16+δ system on the content of the divalent element.

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7. Рис. S2. Дифрактограммы образцов системы Pr4.3Cd0.7Mo3O16+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).

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8. Supplementary materials
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