In situ XAFS study of phase transitions and hydrogen intercalation in WO3-MoO3 system

J. Purans; A. Kuzmin; Ph Parent; H. Dexpert

doi:10.1016/0921-4526(94)00891-X

In situ XAFS study of phase transitions and hydrogen intercalation in WO₃-MoO₃ system

J. Purans
, A. Kuzmin^*
, Ph Parent
, H. Dexpert

^*Corresponding author for this work

Université Paris-Saclay

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

2 Citations (Scopus)

Abstract

The WO₃-MoO₃ system has several reconstructive and displacive phase transitions which can be induced by temperature and/or by change of stoichiometry or valence state of metal ions under hydrogen intercalation. We have studied in situ the local electronic and structural changes arising in WO₃-MoO₃ system with hydrogen intercalation and temperature. In situ XAFS measurements at the Mo K and W L₃ edges in H_yMo_xW_1-xO₃ compounds, performed at different hydrogen intercalation level and temperatures (from RT to 500°C), allowed us to determine the rearrangement in the first and second coordination shells of Mo and W cations during phase transitions. It was found that hydrogen insertion leads, depending on W/Mo ratio, to the appearance of localized (mixed valence) or delocalized electronic states with different Mo and W surrounding.

Original language	English
Pages (from-to)	707-708
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	208-209
Issue number	C
DOIs	https://doi.org/10.1016/0921-4526(94)00891-X
Publication status	Published - 1 Mar 1995

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title = "In situ XAFS study of phase transitions and hydrogen intercalation in WO3-MoO3 system",

abstract = "The WO3-MoO3 system has several reconstructive and displacive phase transitions which can be induced by temperature and/or by change of stoichiometry or valence state of metal ions under hydrogen intercalation. We have studied in situ the local electronic and structural changes arising in WO3-MoO3 system with hydrogen intercalation and temperature. In situ XAFS measurements at the Mo K and W L3 edges in HyMoxW1-xO3 compounds, performed at different hydrogen intercalation level and temperatures (from RT to 500°C), allowed us to determine the rearrangement in the first and second coordination shells of Mo and W cations during phase transitions. It was found that hydrogen insertion leads, depending on W/Mo ratio, to the appearance of localized (mixed valence) or delocalized electronic states with different Mo and W surrounding.",

author = "J. Purans and A. Kuzmin and Ph Parent and H. Dexpert",

year = "1995",

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doi = "10.1016/0921-4526(94)00891-X",

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T1 - In situ XAFS study of phase transitions and hydrogen intercalation in WO3-MoO3 system

AU - Purans, J.

AU - Kuzmin, A.

AU - Parent, Ph

AU - Dexpert, H.

PY - 1995/3/1

Y1 - 1995/3/1

N2 - The WO3-MoO3 system has several reconstructive and displacive phase transitions which can be induced by temperature and/or by change of stoichiometry or valence state of metal ions under hydrogen intercalation. We have studied in situ the local electronic and structural changes arising in WO3-MoO3 system with hydrogen intercalation and temperature. In situ XAFS measurements at the Mo K and W L3 edges in HyMoxW1-xO3 compounds, performed at different hydrogen intercalation level and temperatures (from RT to 500°C), allowed us to determine the rearrangement in the first and second coordination shells of Mo and W cations during phase transitions. It was found that hydrogen insertion leads, depending on W/Mo ratio, to the appearance of localized (mixed valence) or delocalized electronic states with different Mo and W surrounding.

AB - The WO3-MoO3 system has several reconstructive and displacive phase transitions which can be induced by temperature and/or by change of stoichiometry or valence state of metal ions under hydrogen intercalation. We have studied in situ the local electronic and structural changes arising in WO3-MoO3 system with hydrogen intercalation and temperature. In situ XAFS measurements at the Mo K and W L3 edges in HyMoxW1-xO3 compounds, performed at different hydrogen intercalation level and temperatures (from RT to 500°C), allowed us to determine the rearrangement in the first and second coordination shells of Mo and W cations during phase transitions. It was found that hydrogen insertion leads, depending on W/Mo ratio, to the appearance of localized (mixed valence) or delocalized electronic states with different Mo and W surrounding.

UR - https://www.scopus.com/pages/publications/25544466015

U2 - 10.1016/0921-4526(94)00891-X

DO - 10.1016/0921-4526(94)00891-X

M3 - Article

AN - SCOPUS:25544466015

SN - 0921-4526

VL - 208-209

SP - 707

EP - 708

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - C

ER -

In situ XAFS study of phase transitions and hydrogen intercalation in WO₃-MoO₃ system

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