On the relation between molybdenum trioxide and rhenium trioxide type crystal structures

Abstract

The structural relation between MoO3-type and ReO3-type is clarified by considering layers of anions parallel to (13T)MoO3 and (111)RcO3. MoO3 is then seen to be approximately cubic close-packed anions while ReO3 is cubic close-packed anions but with one-quarter of the anion sites unoccupied. The two structures may then be interconverted by a rotation operation resembling that which links ReO3-and PdFa-type structures. Photographs of ball models are used to illustrate the relations. No compounds are known which exhibit direct transition from ReO3-type to either MOO3-or PdF3-type. This is probably because of the large change in volume per anion. The interface between ReO3 and the close packed structures may be described as a dilation fault.

Al2O3–cBN composites sintered by SPS and HPHT methods

“…The CS oxide has a distorted lattice because of missing atomic planes of oxygen. The orthorhombic lattice of Mo4O11 is formed by the absence of oxygen in an ordered manner, in a ReO3 type structure [207,208]. It is composed of repeating layers normal to [1 0 0], that were built by corner sharing of MoO6 octahedra and MoO4 tetrahedra couples [131].…”

High-Rate Lithium Cycling and Structure Evolution in Mo4O11

“…A representation of the crystal structure of Mo 4 O 11 , a bronze-related phase, is shown in Figure . The structure was originally determined by Magnéli, with the correct space group assigned in later studies. , This structure can be described by the ordered removal of oxygen from an ReO 3 -type structure. ,, The high occurrence of MoO 4 tetrahedra is significantly different from other Mo oxides. In contrast with shear phases, this fully corner-connected structure accommodates the oxygen deficiency (referenced to MoO 3 ) by having a combination of octahedral MoO 6 and tetrahedral MoO 4 .…”

Electronic properties of reduced molybdenum oxides

“…47 In addition, the Mo 17 O 47 and Mo 5 O 14 phases are based on pentagonal bipyramids within the ReO 3 structure. 48,49 Mo 4 O 11 , most stable in the orthorhombic form, can also be described by the ordered emission of oxygen from the ReO 3 lattice. 49,50 In this work, the ReO 3 based structures are described as non-layered due to the loss of the van der Waals gap.…”

“…48,49 Mo 4 O 11 , most stable in the orthorhombic form, can also be described by the ordered emission of oxygen from the ReO 3 lattice. 49,50 In this work, the ReO 3 based structures are described as non-layered due to the loss of the van der Waals gap. A recent study has been done to develop a thermodynamic description of the Mo-O system using the CALPHAD (CALculation of PHAse Diagrams) method.…”