An investigation of the Nd{sub 2}O{sub 3}-MoO{sub 3} phase system: Thermal decomposition of Nd{sub 2}Mo{sub 4}O{sub 15} and formation of Nd{sub 6}Mo{sub 10}O{sub 39}
Journal Article
·
· Journal of Solid State Chemistry
- Department of Chemistry, University of Durham, Science Site, South Road, Durham DH1 3LE (United Kingdom)
A new neodymium molybdate, Nd{sub 6}Mo{sub 10}O{sub 39}, has been identified in the Nd{sub 2}O{sub 3}-MoO{sub 3} phase system. Nd{sub 6}Mo{sub 10}O{sub 39} appears to be a metastable phase, which does not form directly from a stoichiometric mixture of Nd{sub 2}O{sub 3} and MoO{sub 3} oxides. Instead, it can be obtained by thermal decomposition of Nd{sub 2}Mo{sub 4}O{sub 15}. Nd{sub 2}Mo{sub 4}O{sub 15} usually decomposes into Nd{sub 2}(MoO{sub 4}){sub 3}, and the formation of Nd{sub 6}Mo{sub 10}O{sub 39} critically depends on the heating regime used. The structure of Nd{sub 6}Mo{sub 10}O{sub 39} has been determined by single crystal X-ray diffraction. It crystallizes in the monoclinic space group C2/c, with unit cell parameters of a=12.425(1)A, b=19.860(2)A, c=13.882(1)A, {beta}=100.767(2){sup o}, V=3365.2(5)A{sup 3} at 120K. Nd atoms are seven and eight coordinate, and pairs of coordination polyhedra share edges and faces, respectively, to form Nd{sub 2}O{sub 12} and Nd{sub 2}O{sub 13} groups. All Mo atoms are in tetrahedral coordination environments, with some of the tetrahedra sharing corners to form pyromolybdate groups.
- OSTI ID:
- 20905331
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 6 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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