Структурные, спектральные характеристики ортоборатов La-=SUB=-0.99-x-=/SUB=-Tb-=SUB=-x-=/SUB=-Eu-=SUB=-0.01-=/SUB=-BO-=SUB=-3-=/SUB=- и перенос энергии от Tb-=SUP=-3+-=/SUP=- к Eu-=SUP=-3+-=/SUP=-
Abstract:The structure, IR absorption spectra, luminescence spectra (SL), and luminescence excitation spectra (LES) of La0.99хTbxEu0.01BO3 orthoborates synthesized at 970°С at 0 ≤ x ≤ 0.99 were studied. An increase in x leads to the successive emergence of three structural states of these compounds. At 0 ≤ x ≤ 0.2, orthoborates have an aragonite structure; then, at 0.2 <x< 0.89, they become two-phase and contain the aragonite and vaterite phases. At 0.89 ≤ x ≤0.99, the compounds have a vaterite structure. A cor… Show more
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