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The La 3 Ga 5.5 Ta 0.5 O 14 (LGT) single crystals nominally doped with 5at.% and 1at.% of Er 3+ were grown by the Czochralski method in an atmosphere of nitrogen containing small amount of oxygen. Examination of the grown crystals employing a coupled plasma emission spectroscopy (ICP ES) revealed that actual concentrations of Er 3+ ions amount to 3.8at...
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