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Dielectric properties of LiNbO 3 crystals have been investigated at 1 kHz and 1 MHz frequencies in the temperature range 30–1200 ∘ C both before and after annealing in the vacuum. The ferroelectric transition temperature was 1170 ∘ C for nonannealed samples, and notably decreases after the reduction. Depending on the annealing time, the maximum of dielectric constant value...
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