A bond valence analysis of electroluminescent ZnS: Cu, Cl to elucidate the aging mechanism

1997 ◽  
Vol 212 (3) ◽  
Author(s):  
N. E. Brese
Keyword(s):  
Bond Valence ◽  
Related Phenomenon ◽  
Aging Mechanism ◽  
Halogen Atoms ◽  
Brightness Decay ◽  
Bond Valence Analysis

AbstractBrightness decay in electroluminescent (EL) phosphors is a diffusion-related phenomenon. Copper is shown to be the most easily diffusing species, although all diffusion is strongly influenced by the presence of sulfur vacancies or, to a lesser extent, halogen atoms substituting on sulfur sites. Diffusion is facile in the Cu

Zur Kristallchemie der Elemente: Schmelztemperatur, Atomvolumen, formale Wertigkeit und Bindungsvalenzen

1995 ◽  
Vol 210 (11) ◽  
Author(s):  
M. Trömel ◽  
H. Alig ◽  
L. Fink ◽  
J. Lösel
Keyword(s):  
Bond Valence ◽  
Group Number ◽  
Bond Valence Analysis

AbstractBond valence analysis has been performed on crystalline elements which occur in different modifications. For this purpose, the covalence of elements of main groups I to IV is set equal to group number

scholarly journals X-ray Rietveld structure refinement and bond-valence analysis of Cs2TeI6

2010 ◽  
Vol 3 (3/4) ◽  
pp. 108-114 ◽  
Author(s):  
V.I. SIDEY ◽  
◽  
O.V. ZUBAKA ◽  
I.P. STERCHO ◽  
E.Yu. PERESH ◽  
...  
Keyword(s):  
Structure Refinement ◽  
Bond Valence ◽  
X Ray ◽  
Bond Valence Analysis

Crystal Structure and Twinning of Rb3Mo14O22

2012 ◽  
Vol 194 ◽  
pp. 10-13
Author(s):  
Markus Hainz ◽  
Herbert Boller
Keyword(s):  
Crystal Structure ◽  
Structural Model ◽  
Close Packing ◽  
Bond Valence ◽  
Rubidium Atoms ◽  
Multiple Twinning ◽  
Bond Valence Analysis

Rb3Mo14O22 has been prepared and its crystal structure determined: S.G.: P21/c (No.14), a = 10.462(7), b = 9.414(2), c = 9.956(5) Ǻ, β = 103.73(2)°, Z = 2, R = 0.046. It is isotypic to K3Mo14O22. The crystal structure can be described as a substitutional derivative of a ccp close packing of oxygen and rubidium atoms with interspersed Mo14O34 units having a core of three trans-edge condensed molybdenum octahedra. The observed multiple twinning is explained by this structural model. A bond valence analysis is presented.

ChemInform Abstract: X-Ray Powder Diffraction Studies and Bond-Valence Analysis of Hg2Sb2O7.

ChemInform ◽  
2008 ◽  
Vol 39 (34) ◽  
Author(s):  
V. I. Sidey ◽  
P. M. Milyan ◽  
O. O. Semrad ◽  
A. M. Solomon
Keyword(s):  
Powder Diffraction ◽  
Bond Valence ◽  
X Ray ◽  
Bond Valence Analysis

Bond Valence Analysis of BaRuO3

2000 ◽  
Vol 151 (2) ◽  
pp. 245-252 ◽  
Author(s):  
A. Santoro ◽  
I. Natali Sora ◽  
Q. Huang
Keyword(s):  
Bond Valence ◽  
Bond Valence Analysis

ChemInform Abstract: Crystal Structure, Physical Properties and Bond Valence Analysis of NaLuP2O7.

ChemInform ◽  
2014 ◽  
Vol 45 (28) ◽  
pp. no-no
Author(s):  
Anis Bejaoui ◽  
Karima Horchani-Naifer ◽  
Mounir Hajji ◽  
Mokhtar Ferid
Keyword(s):  
Crystal Structure ◽  
Physical Properties ◽  
Bond Valence ◽  
Bond Valence Analysis

X-ray powder diffraction studies and bond-valence analysis of Hg2Sb2O7

2008 ◽  
Vol 457 (1-2) ◽  
pp. 480-484 ◽  
Author(s):  
V.I. Sidey ◽  
P.M. Milyan ◽  
O.O. Semrad ◽  
A.M. Solomon
Keyword(s):  
Powder Diffraction ◽  
Bond Valence ◽  
X Ray ◽  
Bond Valence Analysis

Bond valence analysis of ion transport in reverse Monte Carlo models of mixed alkali glasses

2002 ◽  
Vol 756 ◽  
Author(s):  
Stefan Adams ◽  
Jan Swenson
Keyword(s):  
Ion Transport ◽  
High Efficiency ◽  
Volume Fraction ◽  
Ionic Conductivities ◽  
Bond Valence ◽  
Mixed Alkali ◽  
Mixed Alkali Effect ◽  
Ion Conducting ◽  
Mobile Ions ◽  
Bond Valence Analysis

ABSTRACTAn analysis of RMC structure models of ion conducting glasses in terms of our bond softness sensitive bond-valence method enables us to identify the conduction pathways for a mobile ion as regions of sufficiently low valence mismatch. The strong correlation between the volume fraction F of the “infinite pathway cluster” and the transport properties yields a prediction of both the absolute value and activation energy of the dc ionic conductivities directly from the structural models. Separate correlations for various types of mobile cations can be unified by employing the square root of the cation mass as a scaling factor. From the application of this procedure to RMC models of mixed alkali glasses, the mixed alkali effect, i.e. the extreme drop of the ionic conductivity when a fraction of the mobile ions is substituted by another type of mobile ions may be attributed mainly to the blocking of conduction pathways by unlike cations. The high efficiency of the blocking can be explained by the reduced fractal dimension of the pathways on the length scale of individual ion transport steps.

Li0.97FeII0.79FeIII0.15(PO4), a new oxidized triphylite-type phosphate

2012 ◽  
Vol 68 (7) ◽  
pp. i53-i54 ◽  
Author(s):  
Fabrice Dal Bo ◽  
Frédéric Hatert
Keyword(s):  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
Bond Valence ◽  
Edge Sharing Octahedra ◽  
Substitution Mechanism ◽  
Bond Valence Analysis

This paper reports a new partially oxidized triphylite-type phosphate (lithium iron phosphate), which has been synthesized hydrothermally at 973 K and 0.1 GPa. The structure is similar to that of natural triphylite, LiFe(PO4), and is characterized by two chains of edge-sharing octahedra parallel to thebaxis. The weakly distortedM1 octahedra contain Li atoms, whereas the more strongly distortedM2 octahedra contain FeIIand FeIIIatoms. Refined site occupancies and bond-valence analysis show the presence of FeIIIand vacancies on theM2 site, mainly explained by the substitution mechanism 3 FeII= 2 FeIII+ vacancies.

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