Phosphate tungsten bronzes

Skopenko, V. V.; Lisnyak, Vladyslav V.; Stus, N. V.; Slobodyanik, Nikolay S.

doi:10.1070/rc2004v073n08abeh000898

Cited by 6 publications

(8 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The structures and electrical properties of tungsten monophosphate crystals have been described in several papers. 14,[18][19][20][21][22][23][24] Figure 11 illustrates the important structural features. Figure 11A shows the idealized (ReO 3 ) unit cell of WO 3 with a phosphorus ion substituted for one of the tungsten ions.…”

Section: Discussionmentioning

confidence: 99%

“…14 As one might expect from their structures, they act as "quasi two-dimensional" conductors. 17,20 Conduction occurs within the tungsten oxide layers as the result of the mixed oxidation state of the tungsten cations, W 5+ /W 6+ . At room-temperature, electrical conductivity decreases with increasing m, ranging from about 5x10 5 to 1.1x10 4 S/m between the m2 and m12 phases.…”

Section: Discussionmentioning

confidence: 99%

“…At these temperatures, charge density waves have been detected. 14,[18][19][20][21][22][23][24] Unfortunately, no data are available for the temperature range explored in this study.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Thermoelectric properties of tungsten‐titanium‐phosphate glass‐ceramics

et al. 2021

View full text Add to dashboard Cite

Transition-metal oxide (TMO) glasses have long been studied for their electrical conductivity. 1,2 Both fundamental understanding of the conduction mechanism and electrical property measurements have been the subjects of numerous investigations. 3 The highest conductivities have been measured on phosphate glasses containing transition-metal ions such as vanadium, molybdenum, tungsten, and iron with mixed oxidation states. The glasses are typically semiconducting and exhibit DC conductivities ranging from 10 −9 to 1 S/m.Glass-ceramics in the WO 3 -TiO 2 -P 2 O 5 (WTP) system with unusually high electrical conductivity, up to ~6000 S/m, were first reported by Aitken. 4 In a recent article, one of the primary phases in these glass-ceramics was identified as a tungsten monophosphate from the series (PO 4 ) 2 (WO 3 ) 2m . 5 As the ceramming temperature increased, the phase assemblage changed from a mixture of WO 3 , TiP 2 O 7 , and tungsten phosphate to tungsten phosphate and titanium phosphate only. The microstructure was described as an interconnecting network of prismatic tungsten phosphate crystals in a TiP 2 O 7 matrix.The thermoelectric behavior of a material is defined by its electrical conductivity (σ), Seebeck coefficient (α), and thermal conductivity (κ). From these data, the dimensionless figure-of-merit (ZT) is calculated as: 6The conversion efficiency of a thermoelectric power generator is related to the ZTs of the p-type and n-type elements, with ZT >1 generally considered a requirement. [6][7][8] Efficiency is also directly related to the temperature gradient across the elements, and, therefore, materials that can operate at high temperatures are desired.Electrically conductive, oxide ceramics have been widely investigated for their potential use as high-temperature thermoelectrics. 7,9 At least two challenges face these materials. The first is identifying oxides that meet the ZT >1

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Thermoelectric properties of tungsten‐titanium‐phosphate glass‐ceramics

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The tungsten phosphate phases formed in these glass‐ceramics belong to a series of monophosphate tungsten bronzes of the general formula (PO 2 ) 4 (WO 3 ) 2m . Reviews of tungsten phosphate bronze crystal structures and their electrical properties have been reported in the literature …”

Section: Discussionmentioning

confidence: 99%

A new identification of the conducting phase in tungsten‐titanium‐phosphate glass‐ceramics

et al. 2020

View full text Add to dashboard Cite

Glass‐ceramics in the tungsten‐titanium‐phosphate system were first reported in 1992. The glass‐ceramics exhibited electrical resistivity as low as log(ρ) = −1.8 Ω·cm, which was attributed to an interconnecting network of tungsten suboxide crystals, WO3−x. A new identification of the conducting phase as a phosphate tungsten bronze, (PO4)2(WO3)2m, is reported. High‐temperature x‐ray diffraction and electron microscopy have been used to provide a detailed description of the crystalline phases and their development. As the ceramming temperature was raised, the phase assemblage progressed from cubic tungsten oxide and titanium pyrophosphate to phosphate tungsten bronzes. The m‐values of the bronzes ranged from 2 to 7 depending on composition.

show abstract

“…ß-Diketones and their analogues, diketonate complexes [4], azomethinic and heterocyclic ligands remain "eternal". Creation of new hard-soft ligand systems is attractive [5][6][7][8].…”

mentioning

confidence: 99%

Schiff’s Bases Metal complexes in Biological Applications

Kulkarni¹

2017

JAPLR

View full text Add to dashboard Cite

The article gives an insight into the use of Schiff 's bases as the ligand for the synthesis of various metal complexes. The coordination chemistry is dominated by the utilization of Schiff 's bases as ligands in the study of metal complexes. Further these metal complexes are used extensively in biological field along with many other applications. Several metal complexes of schiff 's bases have been used as antimicrobial agents, DNA cleaving agents, as sensors etc. Thus a glimpse of such several applications has been provided in this article.

show abstract

Phosphate tungsten bronzes

Cited by 6 publications

References 72 publications

Thermoelectric properties of tungsten‐titanium‐phosphate glass‐ceramics

Thermoelectric properties of tungsten‐titanium‐phosphate glass‐ceramics

A new identification of the conducting phase in tungsten‐titanium‐phosphate glass‐ceramics

Schiff’s Bases Metal complexes in Biological Applications

Contact Info

Product

Resources

About