The structure, IR absorption, luminescence and luminescence excitation spectra of Ce3+ and Tb3+ ions have been studied in the crystals of Lu1−x−yCexTbyBO3 solid solutions at 0 ≤ x ≤ 0.01, 0.07 ≤ y ≤ 0.16. It has been shown that Lu1−yTbyBO3 solid solution synthesized at Т = 970°С has the structure of a calcite at 0 y ≤ 0.07, the structure of a vaterite at y ≥ 0.16, and is two-phase in a range of 0.07 y < 0.16. It has been determined that additional alloying of two-phase Lu1-yTbyBO3 samples with the vaterite phase fraction of not more than ~ 20 % with 0.5 – 1 at.% of Ce3+ leads to a significant decrease in the amount of the vaterite phase. It has been demonstrated that Ce3+ ions can be used as structure-sensitive and optically active marks when analyzing the structural state of rare earth orthoborates.
The structure, IR absorption and luminescence spectra of Pr0.99xLuxEu0.01BO3 orthoborates synthesized at 970°C were studied at 0 ≤ x ≤ 0.99. An increase in the concentration of lutetium leads to a sequential change of the structural state of the orthoborates. At first, the orthoborates are single-phase and have an aragonite structure (0 ≤ x ≤ 0.1). Then, they become two-phase and contain the aragonite and vaterite phases (0.1 < x < 0.6). With a further increase in х (0.6 < x ≤ 0.8), the compounds are single-phase with a vaterite structure, then they contain the vaterite and calcite phases (0.8 < x ≤ 0.95), and, finally, they become single-phase with a calcite structure (0.95 < x ≤ 0.99). An unambiguous correspondence between the structural modification and IR spectra of these compounds was established. It is shown that the emission of Eu3 + ions is observed in samples where the concentration of europium exceeds that of praseodymium.
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