Phase formation features in the systems M{sub 2}MoO{sub 4}-Fe{sub 2}(MoO{sub 4}){sub 3} (M=Rb, Cs) and crystal structures of new double polymolybdates M{sub 3}FeMo{sub 4}O{sub 15}

• Published in: Journal of solid state chemistry 2010-03, Vol.183 (3)
• Main Authors: Khal'baeva, Klara M., Solodovnikov, Sergey F., Novosibirsk State University, Pirogov St. 2, Novosibirsk 630090, Khaikina, Elena G., Kadyrova, Yuliya M., Buryat State University, Smolin St. 24a, Ulan-Ude, 670000 Buryat Republic, Solodovnikova, Zoya A., Basovich, Olga M.
• Format: Article
• Language: English
• Subjects: ALKALI METAL COMPOUNDS; CESIUM COMPOUNDS; CHALCOGENIDES; CHARGED PARTICLES; CRYSTAL LATTICES; CRYSTAL STRUCTURE; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; IONS; IRON COMPOUNDS; IRON IONS; IRON OXIDES; MOLYBDATES; MOLYBDENUM COMPOUNDS; MONOCLINIC LATTICES; OXIDES; OXYGEN COMPOUNDS; REFRACTORY METAL COMPOUNDS; RUBIDIUM COMPOUNDS; SPACE GROUPS; SYMMETRY GROUPS; TRANSITION ELEMENT COMPOUNDS
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2010.01.008

The systems M{sub 2}MoO{sub 4}-Fe{sub 2}(MoO{sub 4}){sub 3} (M=Rb, Cs) were shown to be non-quasibinary joins of the systems M{sub 2}O-Fe{sub 2}O{sub 3}-MoO{sub 3}. New compounds M{sub 3}FeMo{sub 4}O{sub 15} were revealed along with the known MFe(MoO{sub 4}){sub 2} and M{sub 5}Fe(MoO{sub 4}){sub 4}. The unit cell parameters of the new compounds are a=11.6192(2), b=13.6801(3), c=9.7773(2) A, beta=92.964(1){sup o}, space group P2{sub 1}/c, Z=4 (M=Rb) and a=11.5500(9), b=9.9929(7), c=14.513(1) A, beta=90.676(2){sup o}, space group P2{sub 1}/n, Z=4 (M=Cs). In the structures of M{sub 3}FeMo{sub 4}O{sub 15} (M=Rb, Cs), a half of the FeO{sub 6} octahedra share two opposite edges with two MoO{sub 6} octahedra linked to other FeO{sub 6} octahedra through the bridged MoO{sub 4} tetrahedra by means of the common oxygen vertices to form the chains along the a axis. The difference between the structures is caused by diverse mutual arrangements of the adjacent polyhedral chains. - Graphical abstract: Systems M{sub 2}MoO{sub 4}-Fe{sub 2}(MoO{sub 4}){sub 3} (M=Rb, Cs) are non-quasibinary joins of the systems M{sub 2}O-Fe{sub 2}O{sub 3}-MoO{sub 3} where new compounds M{sub 3}FeMo{sub 4}O{sub 15} were revealed. Their structures have diverse mutual arrangements of the adjacent chains of Fe{sup 3+}O{sub 6}, MoO{sub 6} and MoO{sub 4} polyhedra.