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首页> 外文期刊>Journal of Materials Research >Processing and electrical properties of Pb_(0.6)Ba_(0.4)Nb_2O_6 ceramics
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Processing and electrical properties of Pb_(0.6)Ba_(0.4)Nb_2O_6 ceramics

机译：Pb_（0.6）Ba_（0.4）Nb_2O_6陶瓷的加工及电性能

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摘要

Lead barium niobate (PBN or Pb_x:Ba_(1_x)Nb_2O_6) is a promising tungsten bronze ceramic system that has a morphotropic phase boundary between the orthorhombic and tetragonal phases at χ ≈ 0.63, where the spontaneous polarization (P_s≈ 60-70 μC/cm~2) and other ferroelectric properties are known to be higher. However, even textured PBN60 ceramics have low P_s (~23.9 μC/cm~2) and piezoelectric charge coefficient (d_(33)≈236 pC/N) as compared to the single crystal counterparts. The aim of this study is to control powder processing, green body formation, and sintering conditions to enhance both densification and electrical properties. Therefore, samples were prepared by tape casting methods using single phase PBN60 and reactive mixture of PbNb_2O_6 and BaNb_2O_6 powders. Three wt% excess PbO was found to be necessary for densification. Our results showed that undoped PBN60 ceramics reached P_s = 33 μC/cm~2, d_(33) = 305 pC/N, and had a T_c = 340-350 ℃. These results are much higher than the reported values in the literature, which can be attributed to the careful ceramic processing such as tape casting (e.g., homogenous green structure), annealing (e.g., control of excess grain boundary phase), and liquid phase sintering (e.g., higher densification).
机译：铌酸铅钡（PBN或Pb_x：Ba_（1_x）Nb_2O_6）是一种很有前途的钨青铜陶瓷系统，其正交相和四方相之间的相变相界为χ≈0.63，其中自发极化（P_s≈60-70μC/ （cm〜2）和其他铁电性能更高。但是，与单晶PBN60陶瓷相比，甚至具有纹理的PBN60陶瓷也具有较低的P_s（〜23.9μC/ cm〜2）和压电电荷系数（d_（33）≈236pC / N）。这项研究的目的是控制粉末加工，生坯形成和烧结条件，以增强致密性和电性能。因此，使用单相PBN60和PbNb_2O_6和BaNb_2O_6粉末的反应混合物，通过流延铸造法制备样品。发现致密化需要三重量％过量的PbO。结果表明，未掺杂的PBN60陶瓷达到P_s = 33μC/ cm〜2，d_（33）= 305 pC / N，T_c = 340-350℃。这些结果比文献中报道的值高得多，这可以归因于精心的陶瓷加工，例如流延铸造（例如，均匀的生坯结构），退火（例如，控制多余的晶界相）和液相烧结（例如，更高的密度）。

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  • 来源
    《Journal of Materials Research》 |2010年第11期|p.2143-2149|共7页
  • 作者

    Sinan Dursun; Cihangir Duran;

  • 作者单位

    Gebze Institute of Technology, Department of Materials Science and Engineering,41400 Gebze/Kocaeli, Turkey;

    rnGebze Institute of Technology, Department of Materials Science and Engineering,41400 Gebze/Kocaeli, Turkey;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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