Effects of AETiO3 additions on phase structure, microstructure and electrical properties of (K0.5Na0.5)NbO3 ceramics

Yunfei Chang, Zupei Yang, Lingling Wei, Bing Liu

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Abstract

Lead-free piezoelectric ceramics with the composition of (K0.5Na0.5)NbO3 (KNN) and 0.995(K0.5Na0.5)NbO3-0.005AETiO3 (AE = Mg, Ca, Sr, Ba) were successfully prepared by conventional ceramic processing. Single perovskite phase with orthorhombic syngony can be obtained in pure KNN, KNN-CT and KNN-ST ceramics. The trace amounts of secondary phase(s) can be detected in KNN-MT and KNN-BT ceramics. Ceramics of KNN-CT and KNN-ST have higher cell parameters and higher densities than those of pure KNN ceramics. Good electrical properties (d33 = 122 pC/N, Kp = 0.38, εr = 421, tan δ = 0.033 and TC = 406 °C) can be obtained in pure KNN ceramics. The KNN-CT ceramics have optimized electrical properties, which are d33 = 116 pC/N, Kp = 0.39, εr = 411, tan δ = 0.024 and TC = 397 °C. Besides, the Pr is 18.8 μC/cm2 and the Ec is 9.65 kV/cm for pure KNN ceramics. By adding AET to KNN, the Pr values decrease with increasing the AE ions radii. The air-sintered pure KNN and KNN-CT ceramics are promising lead-free piezoelectric materials for transducer applications.

Original languageEnglish (US)
Pages (from-to)301-305
Number of pages5
JournalMaterials Science and Engineering A
Volume437
Issue number2
DOIs
StatePublished - Nov 15 2006

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Phase structure
Electric properties
beta-Aminoethyl Isothiourea
Lead
electrical properties
ceramics
microstructure
Microstructure
Piezoelectric ceramics
Piezoelectric materials
Perovskite
Transducers
Ions
Processing
Air
Chemical analysis
piezoelectric ceramics
transducers
perovskite
radii

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Chang, Yunfei ; Yang, Zupei ; Wei, Lingling ; Liu, Bing. / Effects of AETiO3 additions on phase structure, microstructure and electrical properties of (K0.5Na0.5)NbO3 ceramics. In: Materials Science and Engineering A. 2006 ; Vol. 437, No. 2. pp. 301-305.
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abstract = "Lead-free piezoelectric ceramics with the composition of (K0.5Na0.5)NbO3 (KNN) and 0.995(K0.5Na0.5)NbO3-0.005AETiO3 (AE = Mg, Ca, Sr, Ba) were successfully prepared by conventional ceramic processing. Single perovskite phase with orthorhombic syngony can be obtained in pure KNN, KNN-CT and KNN-ST ceramics. The trace amounts of secondary phase(s) can be detected in KNN-MT and KNN-BT ceramics. Ceramics of KNN-CT and KNN-ST have higher cell parameters and higher densities than those of pure KNN ceramics. Good electrical properties (d33 = 122 pC/N, Kp = 0.38, εr = 421, tan δ = 0.033 and TC = 406 °C) can be obtained in pure KNN ceramics. The KNN-CT ceramics have optimized electrical properties, which are d33 = 116 pC/N, Kp = 0.39, εr = 411, tan δ = 0.024 and TC = 397 °C. Besides, the Pr is 18.8 μC/cm2 and the Ec is 9.65 kV/cm for pure KNN ceramics. By adding AET to KNN, the Pr values decrease with increasing the AE ions radii. The air-sintered pure KNN and KNN-CT ceramics are promising lead-free piezoelectric materials for transducer applications.",
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Effects of AETiO3 additions on phase structure, microstructure and electrical properties of (K0.5Na0.5)NbO3 ceramics. / Chang, Yunfei; Yang, Zupei; Wei, Lingling; Liu, Bing.

In: Materials Science and Engineering A, Vol. 437, No. 2, 15.11.2006, p. 301-305.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of AETiO3 additions on phase structure, microstructure and electrical properties of (K0.5Na0.5)NbO3 ceramics

AU - Chang, Yunfei

AU - Yang, Zupei

AU - Wei, Lingling

AU - Liu, Bing

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AB - Lead-free piezoelectric ceramics with the composition of (K0.5Na0.5)NbO3 (KNN) and 0.995(K0.5Na0.5)NbO3-0.005AETiO3 (AE = Mg, Ca, Sr, Ba) were successfully prepared by conventional ceramic processing. Single perovskite phase with orthorhombic syngony can be obtained in pure KNN, KNN-CT and KNN-ST ceramics. The trace amounts of secondary phase(s) can be detected in KNN-MT and KNN-BT ceramics. Ceramics of KNN-CT and KNN-ST have higher cell parameters and higher densities than those of pure KNN ceramics. Good electrical properties (d33 = 122 pC/N, Kp = 0.38, εr = 421, tan δ = 0.033 and TC = 406 °C) can be obtained in pure KNN ceramics. The KNN-CT ceramics have optimized electrical properties, which are d33 = 116 pC/N, Kp = 0.39, εr = 411, tan δ = 0.024 and TC = 397 °C. Besides, the Pr is 18.8 μC/cm2 and the Ec is 9.65 kV/cm for pure KNN ceramics. By adding AET to KNN, the Pr values decrease with increasing the AE ions radii. The air-sintered pure KNN and KNN-CT ceramics are promising lead-free piezoelectric materials for transducer applications.

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