• Aucun résultat trouvé

The niobium phosphate bronze K sub 5 minus x Nb sub 8 P sub 5 O sub 34, a new tunnel structure, first member of the series (K sub 3 Nb sub 6 P sub 4 O sub 26) sub n ter dot KNb …

N/A
N/A
Info
Télécharger
Protected

Academic year: 2021

Partager "The niobium phosphate bronze K sub 5 minus x Nb sub 8 P sub 5 O sub 34, a new tunnel structure, first member of the series (K sub 3 Nb sub 6 P sub 4 O sub 26) sub n ter dot KNb …"

Copied!
1
0
0

Chargement.... (Voir le texte intégral maintenant)

Texte intégral

(1)

The niobium phosphate bronze K sub 5 minus x Nb sub 8 P

sub 5 O sub 34, a new tunnel structure, first member of the

series (K sub 3 Nb sub 6 P sub 4 O sub 26) sub n ter dot

KNb …

Authors

A Benabbas, MM Borel, A Grandin, A Leclaire, B Raveau

Publication date

1990/8/1

Journal

Journal of Solid State Chemistry;(USA)

Volume

87

Issue

2

Description

A new niobium phosphate bronze K {sub 5 {minus} x} Nb {sub 8} P {sub 5} O {sub 34} has been isolated. The structure of this phase has been determined from a single crystal of composition K {sub 4} Nb {sub 8} P {sub 5} O {sub 34} by x-ray diffraction. It crystallizes in the space group P2/c with a= 13.904 (6){angstrom}, b= 6.453 (3){angstrom}, c= 20.64

(1){angstrom},{beta}= 125.05 {degree}(1). This structure consists of (Nb {sub 3} P {sub 2} O {sub 13}){infinity} layers parallel to (100) linked through PO {sub 4} tetrahedra and (Nb {sub 2} O {sub 11}) units. The structural relationships between this bronze and the other members of the series (K {sub 3} Nb {sub 6} P {sub 4} O {sub 26}){sub n} KNb {sub 2} PO {sub 8} are discussed. Attention is drawn to the fact that for this particular n= 1 value two structural forms can be expected.

Références

Télécharger maintenant ( PDF - 1 Page - 244.06 KB )

Documents relatifs

Présence de Peretaite CaSb4O4(OH)2(SO4)2.2H2O dans la Mine de Cetine (Toscane, Italie)

Nous n'avons pas effectué d'analyse quantitative car les caractères radiocristallographiques et optiques du minéral étudié sont tout à fait identiques à ceux de

Aluminate sodalite Sr8[Al12O24](CrO4)2 - a new ferroelectric material

On flux-grown polydomain single-crystals of Sr8[Al12O24](CrO4)2, exploratory domain studies and measurements of birefringence, polarization, dielectric constant and transition

Structure of cubic aluminate sodalite, Sr8[Al12O24](CrO4)2

In order to obtain as much information as possible on SACR and in view of planned studies on its low-temperature phases, the present work was undertaken with

Structure of monoclinic Y4Ni6Al23

The coordination polyhedra around the AI atoms are not equal: there are cubes with at maximum five different compositions, some of them more regular and some

A new elaboration process of the superconducting Tl2Ba2Cu1O6 phase with Tc=90K

At high oxygen content, the structure is orthorhombic and the samples are metallic but non-superconducting.. Upon lowering the oxygen content, the symmetry changes from orthorhombic

Polarized light studies of the ferroelastic domains of K3Fe5F15

After changing the oil , we ob erved the behaviour of the Becke line under a polarized light microscope without analyzer and measured the principal refracrive

Theoretical-experimental evaluation of the photocatalytic activity of KCa2Ta3−xNbxO10

Correlating the experimental data of hydroxyl radicals photogeneration with theoretical calculations results, it is evident that the increasing order of photocatalytic activity

Development of a verification and validation framework for autonomous soft-docking of spacecraft with uncertain dynamic properties

The goal of this thesis is to address the aforementioned motivations and research gaps in the confluence of improving verification and validation processes using flight testing