The coloration effect in KCl: Eu2+ crystals γ-irradiated at 200 K

The formation of colour centers at 200 K in γ‐irradiated KCl crystals doped with Eu2+ ions in a wide concentration range is studied by optical absorption, EPR, and ITC method. The EPR and ITC measurements reveal the drastic decrease of concentration of isolated europium dipoles induced by irradiatio...

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Veröffentlicht in:	Crystal research and technology (1979) 1989-02, Vol.24 (2), p.175-180
Hauptverfasser:	Opyrchal, H., Macalik, B., Nierzewski, K. D.
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: structure, mechanical and thermal properties Exact sciences and technology Physical radiation effects, radiation damage Physics Structure of solids and liquids crystallography γ ray effects
Online-Zugang:	Volltext
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Zusammenfassung:	The formation of colour centers at 200 K in γ‐irradiated KCl crystals doped with Eu2+ ions in a wide concentration range is studied by optical absorption, EPR, and ITC method. The EPR and ITC measurements reveal the drastic decrease of concentration of isolated europium dipoles induced by irradiation at 200 K. Moreover, no correlation between concentration changes of colour centers and Eu2+ dipoles induced by irradiation and postirradiated annealing has been found. The results obtained are explained by radiation stimulated aggregation of Eu2+ dipoles into small clusters at 200 K.
ISSN:	0232-1300 1521-4079
DOI:	10.1002/crat.2170240210