Influence of colour centres on the dislocation charge in alkali halides

1975 ◽  
Vol 27 (1) ◽  
pp. K43-K46 ◽  
Author(s):  
J. Sierra ◽  
J. M. Cabrera
Keyword(s):  
Alkali Halides ◽  
Colour Centres

Colour centres in zircon containing both Eu3+ and U4+ ions

1970 ◽  
Vol 23 (8) ◽  
pp. 1513 ◽  
Author(s):  
PE Fielding
Keyword(s):  
Experimental Data ◽  
Single Crystals ◽  
Absorption Spectra ◽  
Electron Energy ◽  
Energy Levels ◽  
Alkali Halides ◽  
Colour Centres

Single crystals of zircon containing both Eu3+ and U4+ were grown from flux melts cooled at rates varying between 4�/hr and 2�/hr. Irradiation with u.v. develops colour centres only in those regions of a crystal containing Eu3+ and U4+. Fluorescence and absorption spectra measured at temperatures down to 77�K show that these centres are similar in behaviour to F and F' centres in the alkali halides. They are thought to be related to an exchange coupled pair, U4+-02-Eu3+, but the experimental data permit only a description in terms of one-electron energy levels. The same basic behaviour is observed for zircon containing U4+ and any other lanthanide but some interesting differences are described for U4+, Dy3+.

EPR Study of Impurity Colour Centres in P-State in Alkali Halides

1980 ◽  
Vol 101 (1) ◽  
pp. 153-161 ◽  
Author(s):  
P. G. Baranov ◽  
V. A. Khramtsov
Keyword(s):  
Alkali Halides ◽  
Colour Centres

Chemical Effects associated with ‘Colour Centres’ in Alkali Halides

Nature ◽  
1955 ◽  
Vol 175 (4467) ◽  
pp. 1043-1044 ◽  
Author(s):  
W. G. BURNS ◽  
T. F. WILLIAMS
Keyword(s):  
Alkali Halides ◽  
Colour Centres ◽  
Chemical Effects
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