Formation of SrVO3 precursors from Sr(OH)2 and VmOn (2/5 ≦m/ n≦ 2/3) by mechanical stressing under ambient or reducing atmosphere

Wha Sup Lee; Tetsuhiko Isobe; Mamoru Senna

doi:10.1016/s0167-2738(99)00090-9

Formation of SrVO₃ precursors from Sr(OH)₂ and V_mO_n (2/5 ≦m/ n≦ 2/3) by mechanical stressing under ambient or reducing atmosphere

Wha Sup Lee, Tetsuhiko Isobe, Mamoru Senna

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Mechanochemical and subsequent heating processes to produce SrVO₃ are studied, starting from a mixture of Sr(OH)₂ and V_mO_n (2/5 ≦ m/n ≦2/3) by milling and heating in an ambient or reducing atmosphere. Single phase perovskite SrVO₃ was obtained by firing the milled mixtures at 1300°C under reducing atmosphere with four dehydration steps via two intermediates, Sr₂V₂O₇ and Sr₈V₈O₂₅. The fourth dehydration step, corresponding to transformation of Sr₈V₈O₂₅ to SrVO₃, appears at around 1100°C by heating mixtures containing trivalent vanadium and milled in a reducing atmosphere. Dehydration of the mixtures was promoted by milling under N₂-4% H₂, due to reduction of precursors by hydrogen. The precursor from the mixture with III-V mixed-valent vanadium milled under N₂-4% H₂ is closer to the final product SrVO₃ than any other precursors.

Original language	English
Pages (from-to)	293-300
Number of pages	8
Journal	Solid State Ionics
Volume	123
Issue number	1-4
DOIs	https://doi.org/10.1016/s0167-2738(99)00090-9
Publication status	Published - 1999

Keywords

Mechanochemical process
Mixed-valency of vanadium
Perovskite
Precursor of SrVO

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/s0167-2738(99)00090-9

Cite this

@article{17531d027458453d83d3f36166f631bb,

title = "Formation of SrVO3 precursors from Sr(OH)2 and VmOn (2/5 ≦m/ n≦ 2/3) by mechanical stressing under ambient or reducing atmosphere",

abstract = "Mechanochemical and subsequent heating processes to produce SrVO3 are studied, starting from a mixture of Sr(OH)2 and VmOn (2/5 ≦ m/n ≦2/3) by milling and heating in an ambient or reducing atmosphere. Single phase perovskite SrVO3 was obtained by firing the milled mixtures at 1300°C under reducing atmosphere with four dehydration steps via two intermediates, Sr2V2O7 and Sr8V8O25. The fourth dehydration step, corresponding to transformation of Sr8V8O25 to SrVO3, appears at around 1100°C by heating mixtures containing trivalent vanadium and milled in a reducing atmosphere. Dehydration of the mixtures was promoted by milling under N2-4% H2, due to reduction of precursors by hydrogen. The precursor from the mixture with III-V mixed-valent vanadium milled under N2-4% H2 is closer to the final product SrVO3 than any other precursors.",

keywords = "Mechanochemical process, Mixed-valency of vanadium, Perovskite, Precursor of SrVO",

author = "Lee, {Wha Sup} and Tetsuhiko Isobe and Mamoru Senna",

note = "Funding Information: This study was partly supported by Special Coordination Funds for Promoting Science and Technology from the Japanese Science and Technology Agency.",

year = "1999",

doi = "10.1016/s0167-2738(99)00090-9",

language = "English",

volume = "123",

pages = "293--300",

journal = "Solid State Ionics",

issn = "0167-2738",

publisher = "Elsevier",

number = "1-4",

}

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T1 - Formation of SrVO3 precursors from Sr(OH)2 and VmOn (2/5 ≦m/ n≦ 2/3) by mechanical stressing under ambient or reducing atmosphere

AU - Lee, Wha Sup

AU - Isobe, Tetsuhiko

AU - Senna, Mamoru

N1 - Funding Information: This study was partly supported by Special Coordination Funds for Promoting Science and Technology from the Japanese Science and Technology Agency.

PY - 1999

Y1 - 1999

N2 - Mechanochemical and subsequent heating processes to produce SrVO3 are studied, starting from a mixture of Sr(OH)2 and VmOn (2/5 ≦ m/n ≦2/3) by milling and heating in an ambient or reducing atmosphere. Single phase perovskite SrVO3 was obtained by firing the milled mixtures at 1300°C under reducing atmosphere with four dehydration steps via two intermediates, Sr2V2O7 and Sr8V8O25. The fourth dehydration step, corresponding to transformation of Sr8V8O25 to SrVO3, appears at around 1100°C by heating mixtures containing trivalent vanadium and milled in a reducing atmosphere. Dehydration of the mixtures was promoted by milling under N2-4% H2, due to reduction of precursors by hydrogen. The precursor from the mixture with III-V mixed-valent vanadium milled under N2-4% H2 is closer to the final product SrVO3 than any other precursors.

AB - Mechanochemical and subsequent heating processes to produce SrVO3 are studied, starting from a mixture of Sr(OH)2 and VmOn (2/5 ≦ m/n ≦2/3) by milling and heating in an ambient or reducing atmosphere. Single phase perovskite SrVO3 was obtained by firing the milled mixtures at 1300°C under reducing atmosphere with four dehydration steps via two intermediates, Sr2V2O7 and Sr8V8O25. The fourth dehydration step, corresponding to transformation of Sr8V8O25 to SrVO3, appears at around 1100°C by heating mixtures containing trivalent vanadium and milled in a reducing atmosphere. Dehydration of the mixtures was promoted by milling under N2-4% H2, due to reduction of precursors by hydrogen. The precursor from the mixture with III-V mixed-valent vanadium milled under N2-4% H2 is closer to the final product SrVO3 than any other precursors.

KW - Mechanochemical process

KW - Mixed-valency of vanadium

KW - Perovskite

KW - Precursor of SrVO

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