Fluorite-like phases in the La2MoO6 – Sm2MoO6 – MoO3 system: Homogeneity region, crystal structure, and conductive properties

Samples in the La2MoO6 – Sm2MoO6 – MoO3 system were obtained using the solid-state synthesis method. The phase formation in the given compositional section was firstly studied, and the homogeneity region of the fluorite-like lanthanum-samarium molybdate was determined, as confirmed by XRD analysis i...

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Главные авторы:	Berezhnaya, T. S., Бережная, Т. С., Chebyshev, K. A., Чебышев, К. А.
Формат:	Статья
Язык:	English
Опубликовано:	Elsevier Ltd 2024
Темы:	Fluorite-like structure Transition metal oxides Impedance Sintering
Online-ссылка:	https://dspace.ncfu.ru/handle/123456789/29255
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spelling	ir-123456789-292552024-11-27T13:30:03Z Fluorite-like phases in the La2MoO6 – Sm2MoO6 – MoO3 system: Homogeneity region, crystal structure, and conductive properties Berezhnaya, T. S. Бережная, Т. С. Chebyshev, K. A. Чебышев, К. А. Fluorite-like structure Transition metal oxides Impedance Sintering Samples in the La2MoO6 – Sm2MoO6 – MoO3 system were obtained using the solid-state synthesis method. The phase formation in the given compositional section was firstly studied, and the homogeneity region of the fluorite-like lanthanum-samarium molybdate was determined, as confirmed by XRD analysis including Rietveld refinement and SEM with energy-dispersive microanalysis. The fluorite-like phase contains less molybdenum than the isostructural neodymium molybdate Nd5Mo3O16+δ. The homogeneity region of fluorite-like solid solutions has been determined, which corresponds to the La5-xSmxMo2.75O15.75 section in the composition range 2.5 ≤ x ≤ 3.5. The crystal structure is characterized by the splitting of cation positions and the presence of excess oxygen in the octahedral voids of the structure. Oxygen atoms in the octahedral positions are displaced from the center of the voids and enter into the molybdenum coordination sphere. The density of single-phase ceramic samples increases with the increase in samarium content. The conductive properties of single-phase ceramics were investigated in an air atmosphere using impedance spectroscopy. The total conductivity was ∼10−2 S cm−1 for La2.5Sm2.5Mo2.75O15.75 at 800 °C. The grain bulk conductivity exhibits a break at a temperature of approximately 600 °C, which may be explained by the depletion of charge carriers in the structure. 2024-11-27T13:29:05Z 2024-11-27T13:29:05Z 2024 Статья Berezhnaya T.S., Chebyshev K.A. Fluorite-like phases in the La2MoO6 – Sm2MoO6 – MoO3 system: Homogeneity region, crystal structure, and conductive properties // Ceramics International. - 2024. - 50 (23). - pp. 49803 - 49813. - DOI: 10.1016/j.ceramint.2024.09.323 https://dspace.ncfu.ru/handle/123456789/29255 en Ceramics International application/pdf application/pdf Elsevier Ltd
institution	СКФУ
collection	Репозиторий
language	English
topic	Fluorite-like structure Transition metal oxides Impedance Sintering
spellingShingle	Fluorite-like structure Transition metal oxides Impedance Sintering Berezhnaya, T. S. Бережная, Т. С. Chebyshev, K. A. Чебышев, К. А. Fluorite-like phases in the La2MoO6 – Sm2MoO6 – MoO3 system: Homogeneity region, crystal structure, and conductive properties
description	Samples in the La2MoO6 – Sm2MoO6 – MoO3 system were obtained using the solid-state synthesis method. The phase formation in the given compositional section was firstly studied, and the homogeneity region of the fluorite-like lanthanum-samarium molybdate was determined, as confirmed by XRD analysis including Rietveld refinement and SEM with energy-dispersive microanalysis. The fluorite-like phase contains less molybdenum than the isostructural neodymium molybdate Nd5Mo3O16+δ. The homogeneity region of fluorite-like solid solutions has been determined, which corresponds to the La5-xSmxMo2.75O15.75 section in the composition range 2.5 ≤ x ≤ 3.5. The crystal structure is characterized by the splitting of cation positions and the presence of excess oxygen in the octahedral voids of the structure. Oxygen atoms in the octahedral positions are displaced from the center of the voids and enter into the molybdenum coordination sphere. The density of single-phase ceramic samples increases with the increase in samarium content. The conductive properties of single-phase ceramics were investigated in an air atmosphere using impedance spectroscopy. The total conductivity was ∼10−2 S cm−1 for La2.5Sm2.5Mo2.75O15.75 at 800 °C. The grain bulk conductivity exhibits a break at a temperature of approximately 600 °C, which may be explained by the depletion of charge carriers in the structure.
format	Статья
author	Berezhnaya, T. S. Бережная, Т. С. Chebyshev, K. A. Чебышев, К. А.
author_facet	Berezhnaya, T. S. Бережная, Т. С. Chebyshev, K. A. Чебышев, К. А.
author_sort	Berezhnaya, T. S.
title	Fluorite-like phases in the La2MoO6 – Sm2MoO6 – MoO3 system: Homogeneity region, crystal structure, and conductive properties
title_short	Fluorite-like phases in the La2MoO6 – Sm2MoO6 – MoO3 system: Homogeneity region, crystal structure, and conductive properties
title_full	Fluorite-like phases in the La2MoO6 – Sm2MoO6 – MoO3 system: Homogeneity region, crystal structure, and conductive properties
title_fullStr	Fluorite-like phases in the La2MoO6 – Sm2MoO6 – MoO3 system: Homogeneity region, crystal structure, and conductive properties
title_full_unstemmed	Fluorite-like phases in the La2MoO6 – Sm2MoO6 – MoO3 system: Homogeneity region, crystal structure, and conductive properties
title_sort	fluorite-like phases in the la2moo6 – sm2moo6 – moo3 system: homogeneity region, crystal structure, and conductive properties
publisher	Elsevier Ltd
publishDate	2024
url	https://dspace.ncfu.ru/handle/123456789/29255
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Fluorite-like phases in the La2MoO6 – Sm2MoO6 – MoO3 system: Homogeneity region, crystal structure, and conductive properties

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