New extended clusters in ternary molybdenum oxides

McCarley, Robert E.; Lii, Kwang Hwa; Edwards, Paul A.; Brough, Lawrence F.

doi:10.1016/s0022-4596(85)80056-6

Cited by 78 publications

(61 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Five X-ray diffraction patterns recorded during the operando experiment (x= 0.5, ~0.9) and the in situ experiment (x = 0.59, 0.75, 0.77) are presented in Figure 9 to highlight this slab gliding occurring during the sodium electrochemical intercalation. Firstly sodium ions occupy octahedral sites in Na0.5MoO2 as it is clear that the 111m and -202m reflections are stronger than the 201m and -112m ones, in agreement with the model previously reported in the literature 14,24 . The stacking of the next phase, Na0.55MoO2, is still unclear as the subcell indexing its X-ray pattern has not been determined yet.…”

Section: Evolution Of the Cell Parameters And Stackingsupporting

confidence: 90%

See 1 more Smart Citation

The Na_xMoO₂ Phase Diagram (¹/₂ ≤ x < 1): An Electrochemical Devil’s Staircase

Vitoux¹,

Guignard²,

Suchomel³

et al. 2017

Chem. Mater.

View full text Add to dashboard Cite

Layered sodium transition metal oxides represent a complex class of materials that exhibit a variety of properties, e.g. superconductivity, and can feature in a range of applications, e.g. batteries. Understanding the structure-function relationship is key to developing better materials. In this context, the phase diagram of the NaxMoO2 system has been studied using electrochemistry combined with in situ synchrotron X-ray diffraction experiments. The many steps observed in the electrochemical curve of Na2/3MoO2 during cycling in a sodium battery suggests numerous reversible structural transitions during sodium (de)intercalation between Na0.5MoO2 and Na~1MoO2. In situ X-ray diffraction confirmed the complexity of the phase diagram within this domain, thirteen single phase domains with minute changes in sodium contents. Almost all display superstructure or modulation peaks in their X-ray diffraction patterns suggesting the existence of many NaxMoO2 specific phases that are believed to be characterized by sodium/vacancy ordering as well as Mo-Mo bonds and subsequent Mo-O distances patterning in the structures. Moreover, a room temperature triclinic distortion was evidenced in the composition range 0.58 ≤ x < 0.75, for the first time in a sodium layered oxide system. Monoclinic and triclinic subcell parameters were refined for every NaxMoO2 phase identified. Reversible [MoO2] slab glidings occur during the sodium (de)intercalation. This level of structural detail provides unprecedented insight on the phases present and their evolution which may allow each phase to be isolated and examined in more detail.

show abstract

Section: Evolution Of the Cell Parameters And Stackingsupporting

confidence: 90%

“…This behavior was observed in several molybdenum oxides in which the molybdenum oxidation state is smaller than 4 [14][15][16][17][18][19][20] . Mo-Mo bonds are therefore expected to form in the [MoO2] slabs of the NaxMoO2 phases alongside sodium/vacancy ordering and can have a dramatic effect on the properties of the materials.…”

Section: Introductionmentioning

confidence: 60%

The Na_xMoO₂ Phase Diagram (¹/₂ ≤ x < 1): An Electrochemical Devil’s Staircase

Vitoux¹,

Guignard²,

Suchomel³

et al. 2017

Chem. Mater.

View full text Add to dashboard Cite

show abstract

“…Close compositions reported in literature are M x Mo 2 O 4 and M x Mo 4 O 6 with M = K, Ba, Li, Na, In, and Sn. [38][39][40][41] However, neither of these compounds Table I. have similar diffraction patterns nor physical properties as follow.…”

Section: Resultsmentioning

confidence: 91%

Unconventional metallic behavior and superconductivity in the K-Mo-O system

et al. 2010

View full text Add to dashboard Cite

Transport properties and magnetization measurements of the K x MoO 2−␦ ͑0 Յ x Յ 0.25͒ compound are reported. The compound crystallizes in the oxygen deficient MoO 2 monoclinic structure with potassium atoms occupying interstitial positions. An unconventional metallic behavior with power-law temperature dependence is related to a magnetic ordering. Superconducting transition with small volume fraction is also observed near 7 K for a sample with low potassium composition.

show abstract

“…Only a brief description of the crystal structure is presented here as the details can be found elsewhere (5,14,16 Fig. 1a).…”

Section: Resultsmentioning

confidence: 99%