Effect of CuBi2O4 additive on dielectric, ferroelectric, and piezoelectric properties of BCTZ lead free ceramics sintered at low temperature

2018 International Conference on Communications and Electrical Engineering (ICCEE) Pub Date : 2018-12-01 DOI:10.1109/CCEE.2018.8634536

N. Zidi, A. Chaouchi, M. Rguiti, C. Courtois, Y. Lorgouilloux

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Abstract

The influence of CuBi2O4 addition on sintering temperature, structural, dielectric and piezoelectric properties of (Ba, Ca)(Ti, Zr)O3 BCTZ ceramics prepared by the direct solid-state reaction were investigated. The X ray diffraction (XRD) data showed a single phase perovskite structure with morphotropic phase for all samples. The scanning electron microscopy observation showed the formation of glass phase in BCTZ doped compositions, which explain the reducing in sintering temperatures. The CuBi2O4 addition decrease the rhomboedral–tetragonal transition temperature and slightly increase Curie temperature. Ferroelectric measurements show that remanent polarisation (P r), and the coercive field of ceramics firstly increases and then decreases with further increasing the CuBi2O4 content. The dielectric behavior of all samples exhibited diffuse phase transition behaviour. Samples of the BCTZ ceramics modified with 0.08% of CuBi2O4 exhibited the highest density (5.39 g/cm³), the highest dielectric constant (εr=10566.) and the best piezoelectric constant (d33 = 320 pC/N)

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CuBi2O4添加剂对低温烧结BCTZ无铅陶瓷介电、铁电和压电性能的影响

研究了CuBi2O4添加量对直接固相反应制备的(Ba, Ca)(Ti, Zr)O3 BCTZ陶瓷烧结温度、结构、介电和压电性能的影响。X射线衍射(XRD)结果表明，所有样品均为单相钙钛矿结构。扫描电镜观察发现，掺杂BCTZ的组分形成了玻璃相，这是烧结温度降低的原因。CuBi2O4的加入降低了正四边形转变温度，略微提高了居里温度。铁电测量结果表明，随着CuBi2O4含量的进一步增加，陶瓷的剩余极化(P r)和矫顽力场先增大后减小。所有样品的介电行为均表现为扩散相变行为。0.08% CuBi2O4改性的BCTZ陶瓷样品密度最高(5.39 g/cm3)，介电常数最高(εr=10566.)，压电常数最佳(d33 = 320 pC/N)。

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2018 International Conference on Communications and Electrical Engineering (ICCEE)

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