Abstract
The conditions of HNbO 3 precipitation on the lithium niobate single-crystal and titanium diffused lithium niobate, LiNbO 3 (LN) were studied. It has been shown, that the maximum of HNbO 3 precipitation corresponds to the highest humidity of atmosphere at the annealing temperatures of 800–850 °C for 5–10 h. Moreover, the application of humid atmosphere during the annealing of LN at 600–850 °C does not ensure in full measure the lack of LiNb 3O 8 precipitation.
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