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Through the partial substitution of Y3+ ions with La3+ ions in the structural framework of YCa4O(BO3)3, the Yb3+‐doped mixed oxyborate Y1−xLaxCa4O(BO3)3 (x = 0.09 and 0.25) crystals have been grown and characterized. The La3+ content (x = 0.25) in the crystal far exceeds the La3+ doping limit (x = 0.1) previously reported, whereas the crystal remains transparent and free from cracks. Optical absorption,...
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