Translated Title
Raman spectroscopic study on the structure and phase transition of A2 (MoO4)3 (A=Al, Cr, Fe)
Translated Abstract
The structures and phase transition of Al2 (MoO4)3,Cr2 (MoO4)3 and Fe2 (MoO4)3 materials have been studied by XRD,Raman spectroscopy and DSC.It is shown that Al2 (MoO4)3,Cr2 (MoO4)3 and Fe2 (MoO4)3 crystallize in monoclinic structure at room temperature and transform to orthorhombic phase at about 483 K,673 K and 783 K,respectively.It is found that frequencies and relative intensities of the symmetric and asymmetric stretching vibrations of the MO4 tetraheda are obviously affected by A3+ cations.They exhibit obvious softening in the order of Fe3+＞ Cr3+＞ Al3+.This is attributed to the size and electronegativity effects of the A3+ cation on the bond strength and flexibility of the MO4 tetrahedra.
Translated Keyword
aluminum molybdate
iron molybdate
negative thermal expansion
chromium molybdate
phase transition
Raman spectroscopy
Access Number
WF:perioarticalgssxb201103012
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