Effects of W/Cr Co-doping on the Crystal Structure and Electric Properties of CaBi2Nb2O9 Piezoceramics

doi:10.15541/jim20240065

Abstract

Abstract:

Calcium bismuth niobate (CaBi₂Nb₂O₉) is a typical bismuth layered structure piezoelectric material with high Curie temperature (about 943 ℃) and high stability, which is an important candidate functional element for high temperature vibration sensors above 600 ℃. However, its low piezoelectric coefficient and high temperature resistivity seriously limit the signal acquisition of high-temperature piezoelectric vibration sensor. To improve the comprehensive performance, in this work, W/Cr co-doped CaBi₂Nb_1.975W_0.025O₉-x%Cr₂O₃ (CBNW-xCr, 0<x≤0.2) Aurivillius phase ceramics were prepared via conventional solid-state sintering route. The effects of W/Cr co-doping on the crystal structure and electrical properties of CBN piezoelectric ceramics were investigated. The results show that co-doping of W/Cr elements transforms crystal structure of the ceramics from orthorhombic to tetragonal crystal system, enhances distortion of the crystal structure, and significantly improves piezoelectric and insulating properties of the piezoelectric ceramics. When x=0.1, the Curie temperature is 931 ℃, the piezoelectric coefficient is 15.6 pC/N, the resistivity reaches the order of 10⁶ Ω∙cm at 600 ℃, and the dielectric loss is only 0.029, which endows the system an important potential application in the field of high-temperature piezoelectricity.

Key words: high-temperature piezoelectric ceramic, crystal structure, piezoelectric property, pseudo-tetragonal distortion

CLC Number:

TQ174

HUANG Jianfeng, LIANG Ruihong, ZHOU Zhiyong. Effects of W/Cr Co-doping on the Crystal Structure and Electric Properties of CaBi₂Nb₂O₉ Piezoceramics[J]. Journal of Inorganic Materials, 2024, 39(8): 887-894.

Figures/Tables 8

Fig. 1 XRD patterns of CBNW-xCr piezoelectric ceramics under room temperature (a) XRD patterns; (b) Enlarged XRD patterns (32.5°≤2θ≤33.5°)

Fig. 2 Rietveld refinement results of XRD patterns for CBNW-xCr piezoelectric ceramics (a) x=0.01; (b) x=0.05; (c) x=0.1; (d) x=0.2; (e) Variation of cell parameters with doping concentration

Fig. 3 SEM images for CBNW-xCr piezoelectric ceramic samples (a) x=0.01; (b) x=0.05; (c) x=0.1; (d) x=0.2

Fig. 4 Variations of dielectric constant and dielectric loss with temperature for CBNW-xCr piezoelectric ceramics (a) Dielectric constant vs temperature; (b) Curie temperature at 1 MHz; (c) Dielectric loss vs temperature; (d) Rate of change of dielectric loss

Fig. 5 Resistivity vs temperature for CBNW-xCr piezoelectric ceramics (a) Resistivity vs temperature; (b-f) Resistivity fitted by Arrhenius function

Fig. 6 Piezoelectric coefficient (d33) of CBNW-xCr piezoelectric ceramics (a) Variation of d33 with doping concentration; (b) Variation of d33 with annealing temperature

Fig. 7 Crystal structure distortion of CBNW-xCr piezoelectric ceramics (a) Schematic of the crystal structure; (b) Tilt and rotation angles of NbO6 octahedra; (c) Trends of d33 and tilt angle with doping concentration

Fig. 8 Ferroelectric hysteresis loops of CBNW-xCr piezoelectric ceramics (a) Ferroelectric hysteresis loops; (b) Trends of Pr and Pmax-Pr with doping concentration

References 32

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Effects of W/Cr Co-doping on the Crystal Structure and Electric Properties of CaBi₂Nb₂O₉ Piezoceramics

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