Color centers in BaMgF ₄ crystals

Abstract

Absorption and emission spectroscopy as well as photo-and thermostimulated luminescence (TSL) methods were used for the energy storage study in a BaMgF 4 single crystal. The obtained data manifests the emission and absorption band positions similar to LiBaF 3 . At the same time, radiation colorability (evaluated as an integral of X-ray induced absorption spectra and TSL curves) of BaMgF 4 is well below. Color center models are considered to explain the obtained results. The radiation resistance of the BaMgF 4 crystal is reasonable for scintillation applications.

Study of electronic structures and absorption bands of BaMgF 4 crystal with F colour centre

“…In the previous articles, the radiating sensitivity of BaMgF 4 crystals from the point of view of the structural defect presence had been mentioned, and the transition energy was calculated by a semi-empirical Mollwo-Ivey equation [4] . The absorption band triplet with maxima at 236, 257 and 274 nm should be corresponding to the F-centre in different positions due to a low symmetry of this crystal structure [5] . Due to lack of direct experimental evidence or theoretical calculations, the origins of 236, 257 and 274 nm absorption bands are not clearly up to now.…”

“…[4] The absorption band triplet with maxima at 236, 257 and 274 nm should correspond to the F-centre in different positions due to the low symmetry of this crystal structure. [5] Due to a lack of direct experimental evidence or theoretical calculations, the origins of 236-, 257-and 274-nm absorption bands have not been clear up to now.…”