EFFECT OF MnO₂ ON THE ELECTRICAL PROPERTIES OF 0.96KNNT-0.04BNZ LEAD-FREE PIEZOELECTRIC CERAMICS
0.96(K0.49Na0.51)(Nb0.97Ta0.03)O₂-0.04Bi0.5Na0.5ZrO₃ + x mol% MnO₂ (0.96KNNT-0.04BNZ + x mol% MnO₂, x=0, 0.1, 0.2, 0.4, 0.6, 0.8) lead-free piezoelectric ceramics were prepared via conventional solid state method. The effect of MnO₂ doping content on the structure and electrical properties of 0.96K...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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University of Chemistry and Technology, Prague
2019-10-01
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| Series: | Ceramics-Silikáty |
| Subjects: | |
| Online Access: |
http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1282
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| Summary: | 0.96(K0.49Na0.51)(Nb0.97Ta0.03)O₂-0.04Bi0.5Na0.5ZrO₃ + x mol% MnO₂ (0.96KNNT-0.04BNZ + x mol% MnO₂, x=0, 0.1, 0.2, 0.4, 0.6, 0.8) lead-free piezoelectric ceramics were prepared via conventional solid state method. The effect of MnO₂ doping content on the structure and electrical properties of 0.96KNNT-0.04BNZ ceramics was investigated. All samples had pure perovskite structure with coexistence of orthorhombic and tetragonal phases at room temperature. The 0.96KNNT-0.04BNZ + 0.2 mol% MnO₂ ceramic sample exhibited enhanced piezoelectric constant (d33=330 pC/N) and planar electromechanical coupling coefficient (kp=38.8%). In addition to other optimized electrical properties such as medium high dielectric permittivity (εT33/ ε₀ =1370) and mechanical quality factor (Qm=135), relatively low dielectric loss (tanδ=2.4%) and high Curie temperature (Tc=305 ̊C), this ceramic sample should be a promising lead-free alternative to toxic lead-based piezoelectric materials. |
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| ISSN: | 0862-5468 1804-5847 |