Influence of the crystal field on bent configuration of V_K centres in AMF₃ compounds

Abstract

On calculating the admixture of the TIg molecular state in the 2Cu ground state by a Czv crystal field, an attempt is made to determine the angle which characterizes the bent configuration of the V, centres in the fluoperovskite lattice.Es wird der Versuch unternommen, bei der Berechnung der Beimischung von 211z-Molekiilzustanden in den 2C,-Grundzustand durch das Czv-Kristallfeld, den Winkel zu bestimmen, der die gebogene Konfiguration der Vg-Zentren im Fluoperovskitgitter charakterisiert.

Radiation Defects in LiBaF3 Perovskites

“…Splitting in the spectrum can be explained by a hyperfine (hfJ interaction of the unpaired spin S = 1/2 with two fluorine nuclei (I = 1/2 with a natural abundance 100%). The first estimations of the F19 hi interaction parameters from the EPR angular dependencies (Au = 2550 MHz; A.l = 300 MHz) are in good agreement with the parameters for VK (fluorine Fz) centres found in other perovskite crystals [5][6][7] In the early stages of the 130 -140 K TSL peak, the diffusion-controlled-tunnelling· recombination kinetics occurs, as discussed in the case of halide crystals [8]. A small steplike (2-5 K) increase of the stimulation temperature leads to the long-term-increase of the recombination luminescence to the quasi-stationary value.…”

STRUCTURE OF THE VK, CENTRE IN AMF3 COMPOUNDS

“…3 RESULTS. -Some details of the calculations are given in reference [7] and the results are summarized in figure 3.…”