• Aucun résultat trouvé

Single-crystal structure of K [sub 3] Nb [sub 8] O [sub 21]

N/A
N/A
Info
Télécharger
Protected

Academic year: 2021

Partager "Single-crystal structure of K [sub 3] Nb [sub 8] O [sub 21]"

Copied!
1
0
0

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

Texte intégral

(1)

Single-crystal structure of K [sub 3] Nb [sub 8] O [sub 21]

Authors

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

1993/3/15 Description

Tripotassium 21-oxooctaniobate, M [sub r]= 1196.53, hexagonal, P6 [sub 3]/mcm, a= 9.1584 (5), c= 12.0404 (4) A, V= 874.6 (1) A [sup 3], Z= 2, D [sub x]= 4.54 Mg m [sup-3],[lambda](Mo K [alpha])= 0.71073 A,[mu]= 5.65 mm [sup-1], F (000)= 1106, T= 294 K, R= 0.044, wR= 0.047 for 2540 reflections with I> 3 [sigma](I). The framework is built up from [Nb [sub 6] O [sub 24]] units stacked along c giving [Nb [sub 6] O [sub 21]][sub [infinity]] chains which are held together by single NbO [sub 6]

octahedra.(orig.). Scholar articles

Références

Télécharger maintenant ( PDF - 1 Page - 142.74 KB )

Documents relatifs

Dielectric properties of orthorhombic Mn3B7O13Cl,Mn3B7O13Br, Mn3B7O13I boracites

The peculiar and ver,y different behaviour of dielectric constant, E , in each compound seems to be consistent with the predictions of current 33phenomenological

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

Growth spirals on single crystals of YBa2Cu3O7-x

which is defined as an uninterrupted periodic chain ( of strong bonds, disregarding the conditions of stoi- ,. chiometry and electroneutrality [ 11]. We simplify by

Growth an dielectric characterization of relaxor ferroelectric Pb(Mg1/3Nb2/3)O3 single crystals

Consultants Bureau, New-York,(l959). 9) W.ABonner and L.G.Van Uitert, "Growth of single crvstals of PboMgNh^Oo by the Kyropoulos technique", Mat.Res .BuUr. 11)

Tetragonal ferroelastic/antiferroelectric chromium-chlorine boracite, Cr3B7O13Cl, from x-ray diffraction on a single-domain crystal at 230 K

It should be noted that cycling through the cubic ~ tetragonal transiti on does not usually lead to a tetragonal ferro- elastic single-domain crystal.. On the other hand,

Crystal structure of methyl 2-O-acetyl-3,5-O-isopropylidene-2-p-nitrophenylazo-β-D-xylofuranoside, C17H21N3O8

Institut de Chimie Pharmaceutique, Université de Genève, 30 quai Ernest-Ansermet, CH-1211 Geneva, Switzerland. (Received February

Single crystal growth, structure refinement, ferroelastic domains and phase transitions of the hausmannite CuCr2O4

(b) Time-derivative of the DSC curve recorded upon heating at 5 K/min. The analysis on single crystal samples showed exactly the same result but with a relatively high

A crystallographic analysis of the macrodomain structure in Pb(Mg1/3Nb2/3)O3

Evidence for a first-order electric-field-induced phase transition in P\1N crystals, from the disordered cubic phase to a polar trigonal 3m phase, has recently