The complex dielectric response of strontium barium niobate relaxor ferroelectrics has been studied as a function of orientation, composition, frequency, and temperature. The dielectric response was found to be strongly dependent on orientation, in distinct comparison to the nearly orientation independent response found for lead magnesium niobate. The dielectric absorption of strontium barium niobate was also found to be much stronger along the c-axis than along any other orientation.
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Viehland et al. (1994) studied this question.