Instability of the local environment of Mn2+ in BaF2

Excitation and luminescence spectra and luminescence lifetime of Mn 2+ ion in BaF 2 crystals at 77 K have been investigated for the first time. Mn 2+ ions in the crystal are coordinated by six and eight fluorine ions, have a trigonal environment, and form exchange-coupled pairs. Several types of cen...

Full description

Saved in:
Bibliographic Details
Published in:Crystallography reports 2017-05, Vol.62 (3), p.430-436
Main Author: Shcherbakov, V. D.
Format: Article
Language:English
Subjects:
Crystallography and Scattering Methods
Crystals
Excitation spectra
Fluorine
Luminescence
Physical Properties of Crystals
Physics
Physics and Astronomy
Structural stability
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Excitation and luminescence spectra and luminescence lifetime of Mn 2+ ion in BaF 2 crystals at 77 K have been investigated for the first time. Mn 2+ ions in the crystal are coordinated by six and eight fluorine ions, have a trigonal environment, and form exchange-coupled pairs. Several types of centers of the Mn 2+ ion are formed mainly because of the large difference in the Mn 2+ and Ba 2+ ionic radii, which causes instability of the local structure around the activator and its strain, and exchange striction. An increase in the impurity concentration enhances these factors, thus changing the relative concentration of various centers.
ISSN:1063-7745
1562-689X
DOI:10.1134/S1063774517020250