ФТТ, 2006, том 48, выпуск 3

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

H.Amor'n*, I.K.Bdikin*,**, A.L.Kholkin*, M.E.V.Costa*

* Department of Ceramics and Glass Engineering \& Center for Research
in Ceramic and Composite Materials (CICECO), University of Aveiro,
3810-193 Aveiro, Portugal
** Institute of Solid State Physics, Russian Academy of Sciences,
Chernogolovka, Moscow district, 142432 Russia
E-mail: kholkin@cv.ua.pt

(Received Juni 24, 2005)

SrBi2Ta2O9 (SBT) single crystals were produced by 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\kern-1ptx\kern-1pt5\kern-1ptx\kern-1pt0.2 mm. X-ray diffraction and x-ray topography measurements revealed the major faces of the crystals with natural rectangular platelet morphology are perfectly (001)-orientated with edges directed along the [110] directions. High quality of the crystals was confirmed by rocking curves (half width of 0.04o for the (0 0 18) reflection) and by ferroelectric measurements. The anisotropy in the dielectic 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.

H. Amor'n and I.K. Bdikin acknowledge the Foundation for Science and Technology (FCT, Portugal) for the financial support through Ph.D. and Postdoctoral grants, respectively.

PACS: 77.84.-s, 81.10.-h

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