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

doi:10.15541/jim20180140

Abstract

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

CLC Number:

TQ174

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.

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

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