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Strontium barium niobate is a tetragonal tungsten bronze solid solution. It has been extensively investigated in single-crystal form by Glass [1] and Liu and Maciolek [2] for pyroelectric applications and by Jamieson et al. [3] from the structural point of view. Filled SBN compositions have been investigated in single-crystal form by Chen and Cross [4], and we have previously reported the ferroelectric properties of modified SBN [3] ceramics of filled compositions.In this letter the effect of doping rare-earth ions on SBN ceramics modified with Na + and K + are investigated. The general formula of the solid solutions is Ro.06Sro.48Bao.30Naoj2KoJ4Nb20 6 where R = Ce 3+,

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