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1 Materials Science Poland

1 2007

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Study of Nb-Zn co-doped Ba(Ti,Zr)O3 ceramics

Wang Y., Zhuang Z., Zhou J.

Materials Science Poland

2007

Vol. 25, No. 1

121--127

The surface coating processing technique was used to modify hydrothermally synthesized- Ba(Ti,Zr)O3 (BTZ) with an Nb-organic compound and Zn-organic compound in an organometallic precursor (Nb-EDTA and Zn-EDTA), which were coated on the powders uniformly. The sintering temperature was decreased and dense ceramics were obtained with well-developed grain growth at 1300 °C. Both increasing the amount of Nb–Zn and decreasing the Nb/Zn ratio greatly promoted grain growth. On increasing the Nb/Zn ratio, the Curie point temperature was markedly lowered, accompanied by a large decrease in the corresponding dielectric maximum and a simultaneous enhancement of the ferroelectric relaxor characteristic. At Nb/Zn = 2, the Curie temperature was monotonously lowered with increasing Nb–Zn content. The shift rate of the phase transition point of Nb–Zn co-doped BTZ was 6.5 °C/mol %. The corresponding dielectric maximum was enhanced rapidly from 9020 for a 0.35 mol % Nb–Zn doped sample to more than 12000 for a 0.90 mol % Nb–Zn doped sample.