Analysis of a qualitative criterion for forecasting off-centre displacement of impurity ions in ionic crystals

1991 ◽  
Vol 13 (3) ◽  
Author(s):  
L. Bosi ◽  
M. Nimis
Keyword(s):  
Ionic Crystals ◽  
Impurity Ions ◽  
Qualitative Criterion

scholarly journals Температурный сдвиг бесфононных f-f-линий люминесценции Er-=SUP=-3+-=/SUP=- в квантовом параэлектрике KTaO-=SUB=-3-=/SUB=-

2020 ◽  
Vol 62 (5) ◽  
pp. 800
Author(s):  
В.А. Трепаков ◽  
А.П. Скворцов ◽  
Z. Potuvcek ◽  
L. Jastrabik ◽  
A. Dejneka
Keyword(s):  
Rare Earth ◽  
Temperature Shift ◽  
Rare Earth Ions ◽  
Luminescence Spectra ◽  
Ionic Crystals ◽  
Impurity Ions ◽  
Rare Earth Impurities

Abstract In KTaO_3:Er crystals, we observed a temperature shift, unusual for rare earth impurities, for narrow zero-phonon luminescence lines, due to the ^4 S _3/2 → ^4 I _13/2, ^4 F _9/2 → ^4 I _15/2, and ^4 S _3/2 → ^4 I _15/2 transitions in Er^3+ impurity ions. The magnitude of the shifts turned out to be comparable with the large shifts of the R lines of the Cr^3+ luminescence in SrTiO_3:Cr and KTaO_3:Cr crystals, that is, substantially larger than that for the three-charged rare earth ions usually observed in the   f – f   luminescence spectra in ionic crystals.

Activation energies for the motion of impurity ions in ionic crystals: Theory and experiment

Physica B+C ◽  
1985 ◽  
Vol 131 (1-3) ◽  
pp. 126-135
Author(s):  
N.M. Bannon ◽  
C.R.A. Catlow ◽  
J. Corish ◽  
W.J. Fredericks ◽  
P.W.M. Jacobs
Keyword(s):  
Activation Energies ◽  
Ionic Crystals ◽  
Impurity Ions ◽  
Theory And Experiment

Theory of stress-induced diffusion in ionic crystals

1972 ◽  
Vol 327 (1568) ◽  
pp. 81-96 ◽  
Keyword(s):  
Solid Solution ◽  
General Class ◽  
Ionic Crystal ◽  
Ionic Crystals ◽  
Ionic Fluxes ◽  
Impurity Ions ◽  
Method Of Solution ◽  
External Stresses ◽  
Stress Induced Diffusion

Relationships are obtained for the ionic fluxes in the sublattices of binary ionic crystals containing Schottky defects, when caused to deform by the application of external stresses. The method of solution of a specific general class of problem is discussed, the forms of solution obtainable with monatomic crystals and with ionic crystals being compared. It is concluded that the forms of solution in the two cases are similar only if the ionic crystal is pure or contains a uniform concentration of impurity ions in solid solution. The principles of the solution of problems involving ionic crystals which are not included in these categories are examined.

Structure-property relationships of PE/PP sandwiched films

1987 ◽  
Vol 45 ◽  
pp. 454-455
Author(s):  
J. Petermann ◽  
G. Broza ◽  
U. Rieck ◽  
A. Jaballah ◽  
A. Kawaguchi
Keyword(s):  
Mechanical Tests ◽  
Polymer Materials ◽  
Ionic Crystals ◽  
Structure Property ◽  
Polymer Systems ◽  
Structure Property Relationships ◽  
Oriented Films ◽  
Materials Used ◽  
Polymer Laminates ◽  
Heated Glass

Oriented overgrowth of polymer materials onto ionic crystals is well known and recently it was demonstrated that this epitaxial crystallisation can also occur in polymer/polymer systems, under certain conditions. The morphologies and the resulting physical properties of such systems will be presented, especially the influence of epitaxial interfaces on the adhesion of polymer laminates and the mechanical properties of epitaxially crystallized sandwiched layers.Materials used were polyethylene, PE, Lupolen 6021 DX (HDPE) and 1810 D (LDPE) from BASF AG; polypropylene, PP, (PPN) provided by Höchst AG and polybutene-1, PB-1, Vestolen BT from Chemische Werke Hüls. Thin oriented films were prepared according to the method of Petermann and Gohil, by winding up two different polymer films from two separately heated glass-plates simultaneously with the help of a motor driven cylinder. One double layer was used for TEM investigations, while about 1000 sandwiched layers were taken for mechanical tests.

INVESTIGATION OF THE VOLATILISATION OF RECOIL PRODUCTS FROM IONIC CRYSTALS

1976 ◽  
Vol 37 (C7) ◽  
pp. C7-543-C7-548
Author(s):  
B. STOJANIK ◽  
R. LAUER ◽  
B. NEIDHART ◽  
K. BÄCHMANN
Keyword(s):  
Ionic Crystals
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