过量Nb2O5对偏铌酸铅压电陶瓷烧结性能和电学性能的影响

doi:10.15541/jim20180140

摘要/Abstract

摘要：

采用传统的固相烧结法制备了组成为PbNb₂O₆-xmol%Nb₂O₅(x=0, 5, 10, 15, 20)的压电陶瓷样品, 研究了过量Nb₂O₅对PbNb₂O₆压电陶瓷烧结性能和电学性能的影响。研究结果表明, 过量Nb₂O₅能够在保证PbNb₂O₆高居里温度和明显各向异性的条件下改善其烧结性能和电学性能。这可能是因为过量Nb₂O₅导致PbNb₂O₆中Nb-O八面体的扭曲, 进而抑制PbNb₂O₆在烧结过程中的三方到四方相变。随着过量Nb₂O₅加入到PbNb₂O₆中, 其压电系数(d₃₃)和致密度都明显提高了, 并且在过量5mol% Nb₂O₅时达到最大值, 分别为69 pC/N和93.1%。

关键词: PN, 压电陶瓷, Nb2O5, 压电性能, 钨青铜

Abstract:

PbNb₂O₆-xmol%Nb₂O₅ (PN-x=0, 5, 10, 15, 20) Piezoelectric ceramics were prepared by solid-state reaction method. The effects of excess Nb₂O₅ on the sintering and electrical properties of PbNb₂O₆ ceramics were investigated. The sintering and electrical properties were evidently improved after the addition of Nb₂O₅ into PN in the condition set for a high T_c and high coupling anisotropy. The improvement may originate from NbO₆ octahedral distortion by excess Nb₂O₅, which prevents phase transition from rhombohedral to tetragonal during the sintering process. With excess addition of Nb₂O₅, the piezoelectric coefficient (d₃₃) and relative density of PN ceramics increased and reached up to 69 pC/N and 93.1%, respectively, at 5mol% addition of Nb₂O₅.

Key words: PbNb2O6, piezoceramics, Nb2O5, piezoelectric property, tungsten bronze

中图分类号:

TQ174

夏标军, 周志勇, 董显林. 过量Nb₂O₅对偏铌酸铅压电陶瓷烧结性能和电学性能的影响[J]. 无机材料学报, 2018, 33(11): 1248-1252.

XIA Biao-Jun, ZHOU Zhi-Yong, DONG Xian-Lin. Effect of Excessive Nb₂O₅ on the Sintering and Electrical Property of Lead Metaniobate Piezoelectric Ceramics[J]. Journal of Inorganic Materials, 2018, 33(11): 1248-1252.

图/表 5

Fig. 1 SEM micrographs of PN-x samples^(a) x=0; (b) x=5; (c) x=10; (d) x=15; (e) x=20

Fig. 3 shows the temperature dependence of dielectric constant (1 kHz) and dielectric loss (tanδ, 1 kHz) of samples with different content of Nb2O5 (x=0, 5, 10, 15 and 20). As it can be seen, Tc and the maximum dielectric constant of the sample increase with the increases of Nb2O5. The addition of excess Nb2O5 into the PN may produce a reaction as equation (1), resulting in vacancies and internal stresses that can enhance dielectric properties.

Fig. 3 The temperature dependence permittivity measured at 1 kHz of PN-x (x=0, 5, 10, 15, 20) ceramics

Fig. 4 Raman spectra of PN-x (x=0, 5, 10, 15, 20) ceramics at room temperature with Raman shift from 60 cm-1 to 1000 cm-1

Fig. 5 Dependence of (a) relative density, (b) d33, (c) k33, and (d) Qm of excess Nb-added PN ceramics on the amount of excess Nb2O5. The reference density is 6.62 g/cm3

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过量Nb₂O₅对偏铌酸铅压电陶瓷烧结性能和电学性能的影响

Effect of Excessive Nb₂O₅ on the Sintering and Electrical Property of Lead Metaniobate Piezoelectric Ceramics

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