Characterization of New Lead-Based Monophosphate Tungsten Bronzes, Pbx(PO2)4(WO3)2m(6≤m≤10)

Roussel, Pascal; Masset, A. C.; Domengès, B.; Maignan, A.; Groult, D.; Labbé, Ph.

doi:10.1006/jssc.1998.7858

Cited by 6 publications

(8 citation statements)

References 28 publications

(17 reference statements)

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“…Thus, one notes a gradual deformation of the octahedra from the centre of the section towards the periphery. This fact is consistent for all seven structures (Lamire et al, 1987a;Roussel, Masset et al, 1998;Roussel, Drouard et al, 1999).…”

Section: Tablesupporting

confidence: 82%

“…More complex arrangements are discovered by electron diffraction, for example ( Figs. 31 and 32) with a sample of Pb x P 4 W 12 O 44 (m = 6) (Roussel, Masset et al, 1998). Type of tilting observed in Na x P 4 W 8 O 32 .…”

Section: Tablementioning

confidence: 97%

“…26), leading to the notation (a 0 b 0 c 0 ). It has been found that the size and shape of the inserted cation in the hexagonal tunnels in¯uence the tilt amplitude with respect to the untilted structure (Roussel, Masset et al, 1998). In the Na compound the tilt angle is $8.5 as in all members of the MPTBp family.…”

Section: Monophosphates With Inserted Cation a X (Po 2 ) 4 (Wo 3 ) 2mmentioning

confidence: 99%

“…For the K compound (Domenge Á s, , the space group A2/m is according to the untilted polyhedral arrangement ( Fig. 28), which preserves only the symmetry centres to become A1 in Na compounds (Benmoussa, Groult & Raveau, 1984) and Pb compounds (Roussel, Masset et al, 1998), where the octahedra are tilted (Fig. 29).…”

Section: Tablementioning

confidence: 99%

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Phosphate tungsten bronze series: crystallographic and structural properties of low-dimensional conductors

Roussel

Pérez

Labbé

2001

Acta Crystallogr B Struct Sci

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Phosphate tungsten bronzes have been shown to be conductors of low dimensionality. A review of the crystallographic and structural properties of this huge series of compounds is given here, corresponding to the present knowledge of the different X-ray studies and electron microscopy investigations. Three main families are described, monophosphate tungsten bronzes, A x (PO 2 ) 4 (WO 3 ) 2m , either with pentagonal tunnels (MPTBp) or with hexagonal tunnels (MPTBh), and diphosphate tungsten bronzes, A x (P 2 O 4 ) 2 (WO 3 ) 2m , mainly with hexagonal tunnels (DPTBh). The general aspect of these crystal structures may be described as a building of polyhedra sharing oxygen corners made of regular stacking of WO 3 -type slabs with a thickness function of m, joined by slices of tetrahedral PO 4 phosphate or P 2 O 7 diphosphate groups. The relations of the different slabs with respect to the basic perovskite structure are mentioned. The structural description is focused on the tilt phenomenon of the WO 6 octahedra inside a slab of WO 3 -type. In this respect, a comparison with the different phases of the WO 3 crystal structures is established. The various modes of tilting and the different possible connections between two adjacent WO 3 -type slabs involve a great variety of structures with different symmetries, as well as the existence of numerous twins in MPTBp's. Several phase transitions, with the appearance of diffuse scattering and modulation phenomena, were analysed by Xray scattering measurements and through the temperature dependence of various physical properties for the MPTBp's. The role of the W displacements within the WO 3 -type slabs, in two modulated structures (m = 4 and m = 10), already solved, is discussed. Finally, the complexity of the structural aspects of DPTBh's is explained on the basis of the average structures which are the only ones solved.

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Section: Tablesupporting

confidence: 82%

Section: Tablementioning

confidence: 97%

Section: Monophosphates With Inserted Cation a X (Po 2 ) 4 (Wo 3 ) 2mmentioning

confidence: 99%

Section: Tablementioning

confidence: 99%

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Phosphate tungsten bronze series: crystallographic and structural properties of low-dimensional conductors

Roussel

Pérez

Labbé

2001

Acta Crystallogr B Struct Sci

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“…Supplemental interest in this bronze family is that most of the investigated members have shown CDW transitions that have been explained using the hidden nesting concept [21,22]. X-ray diffraction investigations performed at room temperature (RT) reveal that the whole pattern can be described using a monoclinic cell [a = 6.5483(6) Å, b = 5.2893(5) Å, c = 18.0789(15) Å, β = 94.7000(4) • ] and the space group P2 1 /m; these cell parameters are in agreement with those reported for Pb x P 4 W 20 O 68 on the basis of a pattern matching analysis performed on the powder diffraction data [23]. The final agreement factor for our data is 4.7% and the refined chemical composition is Na 1.49(8) P 4 W 20 O 68 ; Na sites are partly occupied.…”

supporting

confidence: 77%

Weak localization competes with the quantum oscillations in a natural electronic superlattice: The case of Na1.5(PO2)4(WO3
Kolincio
¹
,
Pérez
²
,
Canadell
³

et al. 2020
Phys. Rev. B
1
1
0
0
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We report an investigation of the combined structural and electronic properties of the bronze Na 1.5 (PO 2 ) 4 (WO 3 ) 20 . Its low-dimensional structure and possible large reconstruction of the Fermi surface due to charge density wave instability make this bulk material a natural superlattice with a reduced number of carriers and Fermi energy. Signatures of multilayered two-dimensional (2D) electron weak localization are consequently reported, with an enhanced influence of quantum oscillations. A crossover between these two antagonistic entities, previously observed only in genuine low-dimensional materials and devices, is shown to occur in a bulk crystal due to its hidden 2D nature.

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Phase Relations, Crystal Structure, and Electron Transport Properties of Phosphate Tungsten Bronzes (K_xNa_y)(PO₂)₄(WO₃)₂_m (m = 4, 6)

et al. 1999

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Phase relations in the system Na-K-P-W-O have been studied for two values m ) 4 and m ) 6 of the relevant parameter m which characterizes the thickness of the perovskite WO 3 -type slabs within the series of the low dimensional tungsten phosphate bronzes (K x -Na y )(PO 2 ) 4 (WO 3 ) 2m . New Na y P 4 W 12 O 44 bronzes (0e y e 1) belonging to the monophosphate tungsten bronzes with pentagonal tunnels family have been isolated and studied by singlecrystal X-ray diffraction and resistivity measurements. The crystal structure of Na 0.96 P 4 W 12 O 44 has been solved and refined to conventional R ) 0.0289 (wR ) 0.0414) with 2924 reflections with I g 3σ(I). Like that of P 4 W 12 O 44 , the unit cell is orthorhombic (space group P2 1 2 1 2 1 ) with a ) 5.3083(3) Å, b ) 6.5790(7) Å, and c ) 23.6360(10) Å. The location of Na + cations in the O 18 cages with pentagonal windows is compared to that of Na + cations in the O 18 cages with hexagonal windows of the monophosphate tungsten bronzes with hexagonal tunnels Na 1.7 P 4 W 12 O 44 . Electron transport properties of single crystals of both monophosphate tungsten bronzes with pentagonal and hexagonal tunnels are described and discussed in terms of possible charge density wave (CDW) instabilities.

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Characterization of New Lead-Based Monophosphate Tungsten Bronzes, Pbx(PO2)4(WO3)2m(6≤m≤10)

Cited by 6 publications

References 28 publications

Phosphate tungsten bronze series: crystallographic and structural properties of low-dimensional conductors

Phosphate tungsten bronze series: crystallographic and structural properties of low-dimensional conductors

Weak localization competes with the quantum oscillations in a natural electronic superlattice: The case of Na1.5(PO2)4(WO3
Kolincio
¹
,
Pérez
²
,
Canadell
³

et al. 2020
Phys. Rev. B
1
1
0
0
View full text Add to dashboard Cite

Phase Relations, Crystal Structure, and Electron Transport Properties of Phosphate Tungsten Bronzes (K_xNa_y)(PO₂)₄(WO₃)₂_m (m = 4, 6)

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Characterization of New Lead-Based Monophosphate Tungsten Bronzes, Pbx(PO2)4(WO3)2m(6≤m≤10)

Cited by 6 publications

References 28 publications

Phosphate tungsten bronze series: crystallographic and structural properties of low-dimensional conductors

Phosphate tungsten bronze series: crystallographic and structural properties of low-dimensional conductors

Weak localization competes with the quantum oscillations in a natural electronic superlattice: The case of Na1.5(PO2)4(WO3Kolincio1, Pérez2, Canadell3 et al. 2020Phys. Rev. B1100View full textAdd to dashboardCite

Phase Relations, Crystal Structure, and Electron Transport Properties of Phosphate Tungsten Bronzes (KxNay)(PO2)4(WO3)2m (m = 4, 6)

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Weak localization competes with the quantum oscillations in a natural electronic superlattice: The case of Na1.5(PO2)4(WO3
Kolincio
¹
,
Pérez
²
,
Canadell
³

et al. 2020
Phys. Rev. B
1
1
0
0
View full text Add to dashboard Cite

Phase Relations, Crystal Structure, and Electron Transport Properties of Phosphate Tungsten Bronzes (K_xNa_y)(PO₂)₄(WO₃)₂_m (m = 4, 6)