Growth and characterization of ferroelectric SrBi2Ta2O9 single crystals via high-temperature self-flux solution method

resumo

StBi(2)Ta(2)O(9) (SBT) single crystals were produced by the high-temperature self-flux solution method using a Bi2O3 flux modified with B2O3. The processing conditions were optimized to obtain large and translucent SBT crystals with a layered habit and typical dimensions of approximately 7 x 5 x 0.2 mm. X-ray diffraction and x-ray topography measurements revealed that the major faces of the crystals with natural rectangular platelet morphology are perfectly (001)-oriented with edges directed along the [110] directions. The high quality of the crystals was confirmed by rocking curves (half-width of 0.04 degrees for the (0018) reflection) and by ferroelectric measurements. The anisotropy in the dielectric and ferroelectric properties was investigated both along the [110] (ab plane) and the [001] (c axis) directions. The growth mechanism, morphology, and dielectric anisotropy of the SBT crystal platelets are discussed based on its crystallographic structure.

palavras-chave

LAYERED PEROVSKITE SRBI2TA2O9; ELECTRICAL-PROPERTIES; CAPACITORS; BI2SRTA2O9; TANTALATE; FAMILY; PHASE

categoria

Physics

autores

Amorin, H; Bdikin, IK; Kholkin, AL; Costa, MEV

nossos autores

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