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The effects of PbZn 1/3 Nb 2/3 O 3 -doping on structural, thermal, optical, dielectric, and ferroelectric properties of BaTiO 3 ceramics

Abstract : Low-lead (1-x)BT-xPZN (x ¼ 0, 0.025, 0.05, 0.075, 0.10, 0.125, and 0.15) ceramics were successfully synthesized by the spark-plasma-sintering method for the first time. Their phase transition behavior as well as structural, thermal, optical, and electrical properties was investigated. These materials exhibit the structure of perovskite-type solid solutions and undergo a sequence of phase transitions, typical of pure BaTiO 3 (BT). The dielectric test results revealed that with the increase in the PbZn 1/3 Nb 2/3 O 3 (PZN) content, the frequency dispersion of electric permittivity increases, whilst the dielectric/ferroelectric properties tend to deteriorate, which is characteristic of relaxor-type behavior. Therefore, it is reasonable to suppose that these ceramics progressively lack long-range ordering. These effects are due to the competition between lone-pair electrons' induced changes in the A-O band upon Pb 2þ addition and ionic size differences. In general, the transition temperatures observed by dielectric analyses are in good agreement with those obtained from X-ray diffraction and differential scanning calorimetry measurements. The BT-PZN system may help to understand why relaxor behavior appears in perovskite-based materials. It appears that these materials can become a good starting point for the development of new low-lead electronic ceramics. Published by AIP Publishing. https://doi.
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Soumis le : mercredi 10 janvier 2018 - 23:53:33
Dernière modification le : jeudi 6 juin 2019 - 14:52:07
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Journal of Applied Physics 122...
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J. Suchanicz, K. Świerczek, D. Sitko, P. Czaja, Pascal Marchet, et al.. The effects of PbZn 1/3 Nb 2/3 O 3 -doping on structural, thermal, optical, dielectric, and ferroelectric properties of BaTiO 3 ceramics. Journal of Applied Physics, American Institute of Physics, 2017, 122 (12), pp.124105 - 124105. ⟨10.1063/1.5005516⟩. ⟨hal-01680653⟩

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