Synthesis, crystal structure and transport properties of a new non-stoichiometric CaVO3+δ phase

Javier García-Jaca; J. Ignacio R. Larramendi; Maite Insausti; M. Isabel Arriortua; Téofilo Rojo

doi:10.1039/JM9950501995

Synthesis, crystal structure and transport properties of a new non-stoichiometric CaVO_3+δ phase

Javier García-Jaca
, J. Ignacio R. Larramendi
, Maite Insausti
, M. Isabel Arriortua
, Téofilo Rojo^*

^*Corresponding author for this work

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

30 Citations (Scopus)

Abstract

A non-stoichiometric calcium vanadium(iv) oxide with formula CaVO _3+δ has been synthesized via the thermal decomposition of the [Ca(VO)(±-C₄H₂O₆)(H₂O) ₄]₂ metallo-organic precursor at 1073 K. The morphology of the samples obtained by using this method shows the influence of the transport vapour phase formed during the ligand pyrolysis. The oxide contains an excess of oxygen, δ= +0.23, which implies that the vanadium atom exhibits an oxidation state between V^IV and V^V. The crystal structure of CaVO_3+δ is perovskite-type with orthorhombic distortion. This distortion modifies the symmetry of the [VO₆] groups as was observed from the crystal refinement. The oxide presents a transition from semiconductor to metallic character at 78 K.

Original language	English
Pages (from-to)	1995-1999
Number of pages	5
Journal	Journal of Materials Chemistry
Volume	5
Issue number	11
DOIs	https://doi.org/10.1039/JM9950501995
Publication status	Published - 1995
Externally published	Yes

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title = "Synthesis, crystal structure and transport properties of a new non-stoichiometric CaVO3+δ phase",

abstract = "A non-stoichiometric calcium vanadium(iv) oxide with formula CaVO 3+δ has been synthesized via the thermal decomposition of the [Ca(VO)(±-C4H2O6)(H2O) 4]2 metallo-organic precursor at 1073 K. The morphology of the samples obtained by using this method shows the influence of the transport vapour phase formed during the ligand pyrolysis. The oxide contains an excess of oxygen, δ= +0.23, which implies that the vanadium atom exhibits an oxidation state between VIV and VV. The crystal structure of CaVO3+δ is perovskite-type with orthorhombic distortion. This distortion modifies the symmetry of the [VO6] groups as was observed from the crystal refinement. The oxide presents a transition from semiconductor to metallic character at 78 K.",

author = "Javier Garc{\'i}a-Jaca and Larramendi, \{J. Ignacio R.\} and Maite Insausti and Arriortua, \{M. Isabel\} and T{\'e}ofilo Rojo",

year = "1995",

doi = "10.1039/JM9950501995",

language = "English",

volume = "5",

pages = "1995--1999",

journal = "Journal of Materials Chemistry",

issn = "0959-9428",

publisher = "Royal Society of Chemistry",

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TY - JOUR

T1 - Synthesis, crystal structure and transport properties of a new non-stoichiometric CaVO3+δ phase

AU - García-Jaca, Javier

AU - Larramendi, J. Ignacio R.

AU - Insausti, Maite

AU - Arriortua, M. Isabel

AU - Rojo, Téofilo

PY - 1995

Y1 - 1995

N2 - A non-stoichiometric calcium vanadium(iv) oxide with formula CaVO 3+δ has been synthesized via the thermal decomposition of the [Ca(VO)(±-C4H2O6)(H2O) 4]2 metallo-organic precursor at 1073 K. The morphology of the samples obtained by using this method shows the influence of the transport vapour phase formed during the ligand pyrolysis. The oxide contains an excess of oxygen, δ= +0.23, which implies that the vanadium atom exhibits an oxidation state between VIV and VV. The crystal structure of CaVO3+δ is perovskite-type with orthorhombic distortion. This distortion modifies the symmetry of the [VO6] groups as was observed from the crystal refinement. The oxide presents a transition from semiconductor to metallic character at 78 K.

AB - A non-stoichiometric calcium vanadium(iv) oxide with formula CaVO 3+δ has been synthesized via the thermal decomposition of the [Ca(VO)(±-C4H2O6)(H2O) 4]2 metallo-organic precursor at 1073 K. The morphology of the samples obtained by using this method shows the influence of the transport vapour phase formed during the ligand pyrolysis. The oxide contains an excess of oxygen, δ= +0.23, which implies that the vanadium atom exhibits an oxidation state between VIV and VV. The crystal structure of CaVO3+δ is perovskite-type with orthorhombic distortion. This distortion modifies the symmetry of the [VO6] groups as was observed from the crystal refinement. The oxide presents a transition from semiconductor to metallic character at 78 K.

UR - https://www.scopus.com/pages/publications/0000787568

U2 - 10.1039/JM9950501995

DO - 10.1039/JM9950501995

M3 - Article

AN - SCOPUS:0000787568

SN - 0959-9428

VL - 5

SP - 1995

EP - 1999

JO - Journal of Materials Chemistry

JF - Journal of Materials Chemistry

IS - 11

ER -

Synthesis, crystal structure and transport properties of a new non-stoichiometric CaVO_3+δ phase

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