Abstract

Transparent KLN crystals 10mm in diameter and 25 to 45mm in length have been grown by the modified vertical Bridgman technique from different melts in the range of 30∼35mol% K 2O, 17∼23mol% Li 2O and 43∼50mol% Nb 2O 5. The growth conditions are a growth rate of less than 0.25 mm/hr, temperature gradient in solid-liquid interface of 2∼3 °C/mm and growth direction of <110>. As-grown KLN crystals have tetragonal tungsten bronze structure. Most of the as-grown crystals do not crack when cooling through the paraelectric/ferroelectric phase transition. 180° domain structures are observed after the KLN crystal was etched in boiling 2HNO 3:Hf. Dielectric properties and transmission spectrum of the as-grown KLN crystals are measured.

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