Synthesis and magnetic properties of β-KVOF3

Martin D. Donakowski; Hongcheng Lu; Romain Gautier; Rana Saha; A. Sundaresan; Kenneth R. Poeppelmeier

doi:10.1002/zaac.201300576

Synthesis and magnetic properties of β-KVOF₃

Martin D. Donakowski, Hongcheng Lu, Romain Gautier, Rana Saha, A. Sundaresan, Kenneth R. Poeppelmeier

Northwestern University

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

11 Citations (Scopus)

Abstract

The potassium vanadium oxide-fluoride phase β-KVOF₃ was prepared by in-situ reduction with hydrothermal methods and characterized by single-crystal X-ray diffraction and magnetic susceptibility measurements. The compound is orthorhombic [space group Pnma, a = 7.1596(2) Å, b = 7.5392(2) Å, c = 13.0506(4) Å, Z = 8]. The material is structurally similar and isoformulaic to d¹ materials of formulae AVOF₃ (A ⁺ = alkali metal, ammonium, or organic cation). Magnetic susceptibility data were successfully fit with a Heisenberg chain model. In-situ reduction of V⁵⁺ to V⁴⁺ during the hydrothermal reaction conditions was observed in the presence of Br^- anions. The role of bromide ions in this reduction is explained and employed to reduce a d ⁰ vanadium species to obtain a material with magnetic behavior.

Original language	English
Pages (from-to)	1109-1114
Number of pages	6
Journal	Zeitschrift fur Anorganische und Allgemeine Chemie
Volume	640
Issue number	6
DOIs	https://doi.org/10.1002/zaac.201300576
Publication status	Published - May 2014

Keywords

Heisenberg chain
Hydrothermal synthesis
Oxide-fluoride
Vanadium

ASJC Scopus subject areas

Inorganic Chemistry

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title = "Synthesis and magnetic properties of β-KVOF3",

abstract = "The potassium vanadium oxide-fluoride phase β-KVOF3 was prepared by in-situ reduction with hydrothermal methods and characterized by single-crystal X-ray diffraction and magnetic susceptibility measurements. The compound is orthorhombic [space group Pnma, a = 7.1596(2) {\AA}, b = 7.5392(2) {\AA}, c = 13.0506(4) {\AA}, Z = 8]. The material is structurally similar and isoformulaic to d1 materials of formulae AVOF3 (A + = alkali metal, ammonium, or organic cation). Magnetic susceptibility data were successfully fit with a Heisenberg chain model. In-situ reduction of V5+ to V4+ during the hydrothermal reaction conditions was observed in the presence of Br- anions. The role of bromide ions in this reduction is explained and employed to reduce a d 0 vanadium species to obtain a material with magnetic behavior.",

keywords = "Heisenberg chain, Hydrothermal synthesis, Oxide-fluoride, Vanadium",

author = "Donakowski, {Martin D.} and Hongcheng Lu and Romain Gautier and Rana Saha and A. Sundaresan and Poeppelmeier, {Kenneth R.}",

year = "2014",

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T1 - Synthesis and magnetic properties of β-KVOF3

AU - Donakowski, Martin D.

AU - Lu, Hongcheng

AU - Gautier, Romain

AU - Saha, Rana

AU - Sundaresan, A.

AU - Poeppelmeier, Kenneth R.

PY - 2014/5

Y1 - 2014/5

N2 - The potassium vanadium oxide-fluoride phase β-KVOF3 was prepared by in-situ reduction with hydrothermal methods and characterized by single-crystal X-ray diffraction and magnetic susceptibility measurements. The compound is orthorhombic [space group Pnma, a = 7.1596(2) Å, b = 7.5392(2) Å, c = 13.0506(4) Å, Z = 8]. The material is structurally similar and isoformulaic to d1 materials of formulae AVOF3 (A + = alkali metal, ammonium, or organic cation). Magnetic susceptibility data were successfully fit with a Heisenberg chain model. In-situ reduction of V5+ to V4+ during the hydrothermal reaction conditions was observed in the presence of Br- anions. The role of bromide ions in this reduction is explained and employed to reduce a d 0 vanadium species to obtain a material with magnetic behavior.

AB - The potassium vanadium oxide-fluoride phase β-KVOF3 was prepared by in-situ reduction with hydrothermal methods and characterized by single-crystal X-ray diffraction and magnetic susceptibility measurements. The compound is orthorhombic [space group Pnma, a = 7.1596(2) Å, b = 7.5392(2) Å, c = 13.0506(4) Å, Z = 8]. The material is structurally similar and isoformulaic to d1 materials of formulae AVOF3 (A + = alkali metal, ammonium, or organic cation). Magnetic susceptibility data were successfully fit with a Heisenberg chain model. In-situ reduction of V5+ to V4+ during the hydrothermal reaction conditions was observed in the presence of Br- anions. The role of bromide ions in this reduction is explained and employed to reduce a d 0 vanadium species to obtain a material with magnetic behavior.

KW - Heisenberg chain

KW - Hydrothermal synthesis

KW - Oxide-fluoride

KW - Vanadium

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