Structural and Mechanistic Studies of the Dehydration of MoO 2 PO 3 OH·H 2 O and the In situ Identification of Two New Molybdenum Phosphates
Structural and Mechanistic Studies of the Dehydration of MoO 2 PO 3 OH·H 2 O and the In situ Identification of Two New Molybdenum Phosphates
复制标题
MoO 2 PO 3 OH·H 2 O脱水结构与机理研究及两种新型磷酸钼盐的原位鉴定
DOI：
10.1021/cm101429u
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发表时间：
2010
影响因子：
8.6
通讯作者：
Lister S
中科院分区：
文献类型：
--
作者：
Lister S
We report investigations into the dehydration pathway of the precursor material MoO2PO3OH·H2O to γ-(MoO2)2P2O7. The reaction occurs in three distinct stages via the formation of two new previously unidentified molybdenum phosphate phases, β-MoOPO4and δ-(MoO2)2P2O7. Conditions for the isolation of these phases were identified by a whole powder pattern fitting technique to follow phase evolution versus time and temperature and later verified by full Rietveld refinement. Structural refinement of β-MoOPO4was performed against X-ray and neutron data. The new phase has lattice parametersa= 7.4043(3) Å,b= 7.2128(3) Å,c= 7.2876(3) Å, β = 118.346(2)°, and volume 342.53(3) Å3at room temperature, containing 7 unique atoms in space groupCc. δ-(MoO2)2P2O7forms on slowly heating the precursor material to 793 K. Lattice parameters at room temperature area= 16.2213(11) Å,b= 3.8936(3) Å, andc= 6.2772(4) Å and volume 396.46(5) Å3, in space groupC2221. A transformation mechanism is proposed for the dehydration. Lithium intercalation into layered δ-(MoO2)2P2O7has been shown.
