Synthesis, structural characterization, and conductive properties of lanthanum-yttrium molybdate, a novel fluorite-like Nd5Mo3O16+δ-type material

A series of samples with the general composition La<inf>5-x</inf>Y<inf>x</inf>Mo<inf>3-y</inf>O<inf>16.5-3y</inf> (0 ≤ x ≤ 5, 0 ≤ y ≤ 0.5) was obtained through solid-state reactions of metal oxides in the La<inf>2</inf>O<inf>3</inf...

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Главные авторы:	Berezhnaya, T. S., Бережная, Т. С., Kabanov, R. V., Кабанов, Р. В., Chebyshev, K. A., Чебышев, К. А.
Формат:	Статья
Язык:	English
Опубликовано:	Elsevier Ltd 2025
Темы:	Ceramic Crystal atomic structure Rietveld refinement Aluminum oxide Ree molybdates Oxide-ion conductors Fluorite structure Impedance spectroscopy
Online-ссылка:	https://dspace.ncfu.ru/handle/123456789/31849
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spelling	ir-123456789-318492025-08-13T11:45:06Z Synthesis, structural characterization, and conductive properties of lanthanum-yttrium molybdate, a novel fluorite-like Nd5Mo3O16+δ-type material Berezhnaya, T. S. Бережная, Т. С. Kabanov, R. V. Кабанов, Р. В. Chebyshev, K. A. Чебышев, К. А. Ceramic Crystal atomic structure Rietveld refinement Aluminum oxide Ree molybdates Oxide-ion conductors Fluorite structure Impedance spectroscopy A series of samples with the general composition La<inf>5-x</inf>Y<inf>x</inf>Mo<inf>3-y</inf>O<inf>16.5-3y</inf> (0 ≤ x ≤ 5, 0 ≤ y ≤ 0.5) was obtained through solid-state reactions of metal oxides in the La<inf>2</inf>O<inf>3</inf> – Y<inf>2</inf>O<inf>3</inf> – MoO<inf>3</inf> system. Within the studied compositional range, the formation of a new lanthanum-yttrium molybdate, La<inf>5-x</inf>Y<inf>x</inf>Mo<inf>3-y</inf>O<inf>16.5-3y</inf>, was observed. This compound is isostructural to Nd<inf>5</inf>Mo<inf>3</inf>O<inf>16+δ</inf> (space group Pn3‾n) and exhibits a narrow homogeneity range. Rietveld refinement of X-ray diffraction data revealed that yttrium atoms predominantly occupy the 12e crystallographic site in the structure. Dense ceramic samples were prepared using the sol-gel method and were employed to investigate the electro-physical properties of the new phase. The exceptionally high dielectric permittivity observed at elevated temperatures is likely attributed to the mobility of oxygen ions within the crystal structure. The grain bulk conductivity follows a thermally activated behavior with a bend at ∼600 °C, reaching values of up to 10−2 S/cm at 900 °C. 2025-08-13T11:42:27Z 2025-08-13T11:42:27Z 2025 Статья Berezhnaya, T. S., Kabanov, R. V., Chebyshev, K. A. Synthesis, structural characterization, and conductive properties of lanthanum-yttrium molybdate, a novel fluorite-like Nd5Mo3O16+δ-type material // Ceramics International. - 2025. - 51 (20). - pp. 32281 - 32290. - DOI: 10.1016/j.ceramint.2025.04.415 https://dspace.ncfu.ru/handle/123456789/31849 en Ceramics International application/pdf application/pdf Elsevier Ltd
institution	СКФУ
collection	Репозиторий
language	English
topic	Ceramic Crystal atomic structure Rietveld refinement Aluminum oxide Ree molybdates Oxide-ion conductors Fluorite structure Impedance spectroscopy
spellingShingle	Ceramic Crystal atomic structure Rietveld refinement Aluminum oxide Ree molybdates Oxide-ion conductors Fluorite structure Impedance spectroscopy Berezhnaya, T. S. Бережная, Т. С. Kabanov, R. V. Кабанов, Р. В. Chebyshev, K. A. Чебышев, К. А. Synthesis, structural characterization, and conductive properties of lanthanum-yttrium molybdate, a novel fluorite-like Nd5Mo3O16+δ-type material
description	A series of samples with the general composition La<inf>5-x</inf>Y<inf>x</inf>Mo<inf>3-y</inf>O<inf>16.5-3y</inf> (0 ≤ x ≤ 5, 0 ≤ y ≤ 0.5) was obtained through solid-state reactions of metal oxides in the La<inf>2</inf>O<inf>3</inf> – Y<inf>2</inf>O<inf>3</inf> – MoO<inf>3</inf> system. Within the studied compositional range, the formation of a new lanthanum-yttrium molybdate, La<inf>5-x</inf>Y<inf>x</inf>Mo<inf>3-y</inf>O<inf>16.5-3y</inf>, was observed. This compound is isostructural to Nd<inf>5</inf>Mo<inf>3</inf>O<inf>16+δ</inf> (space group Pn3‾n) and exhibits a narrow homogeneity range. Rietveld refinement of X-ray diffraction data revealed that yttrium atoms predominantly occupy the 12e crystallographic site in the structure. Dense ceramic samples were prepared using the sol-gel method and were employed to investigate the electro-physical properties of the new phase. The exceptionally high dielectric permittivity observed at elevated temperatures is likely attributed to the mobility of oxygen ions within the crystal structure. The grain bulk conductivity follows a thermally activated behavior with a bend at ∼600 °C, reaching values of up to 10−2 S/cm at 900 °C.
format	Статья
author	Berezhnaya, T. S. Бережная, Т. С. Kabanov, R. V. Кабанов, Р. В. Chebyshev, K. A. Чебышев, К. А.
author_facet	Berezhnaya, T. S. Бережная, Т. С. Kabanov, R. V. Кабанов, Р. В. Chebyshev, K. A. Чебышев, К. А.
author_sort	Berezhnaya, T. S.
title	Synthesis, structural characterization, and conductive properties of lanthanum-yttrium molybdate, a novel fluorite-like Nd5Mo3O16+δ-type material
title_short	Synthesis, structural characterization, and conductive properties of lanthanum-yttrium molybdate, a novel fluorite-like Nd5Mo3O16+δ-type material
title_full	Synthesis, structural characterization, and conductive properties of lanthanum-yttrium molybdate, a novel fluorite-like Nd5Mo3O16+δ-type material
title_fullStr	Synthesis, structural characterization, and conductive properties of lanthanum-yttrium molybdate, a novel fluorite-like Nd5Mo3O16+δ-type material
title_full_unstemmed	Synthesis, structural characterization, and conductive properties of lanthanum-yttrium molybdate, a novel fluorite-like Nd5Mo3O16+δ-type material
title_sort	synthesis, structural characterization, and conductive properties of lanthanum-yttrium molybdate, a novel fluorite-like nd5mo3o16+δ-type material
publisher	Elsevier Ltd
publishDate	2025
url	https://dspace.ncfu.ru/handle/123456789/31849
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Synthesis, structural characterization, and conductive properties of lanthanum-yttrium molybdate, a novel fluorite-like Nd5Mo3O16+δ-type material

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