Piezoelectric enhancements in K0.5Na0.5NbO3-based ceramics via structural evolutions

Izura Izzuddin, Mohammad Hafizuddin Mohammad, Zalita Zainuddin, Nor Huwaida Janil

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The current work aims to compare the effect of systematic A-site and B-site substitutions on the piezoelectricity of Ka0.5Na0.5NbO3 (KNN)-based perovskite ceramics. The A-site elements was replaced by Li+ while Nb5+ was substituted by Sb5+ to form (K0.4675Na0.4675Li0.065)NbO3 (KNLN) and (K0.4675Na0.4675Li0.065)(Nb0.96Sb0.04)O3 (KNLNS) respectively. The ceramics were prepared using solid-state sintering method. The density of the ceramics steadily improved with the substitutions while the crystal structure evolved from monoclinic (in KNN) to the coexistence of monoclinic and tetragonal (in KNLN) and finally tetragonal in KNLNS. Distinct variations on size and morphology were recorded. Although density, crystal structure and morphology have minor effect on the Ec, they imposed considerable influences on Pr, d33 and kp. Despite relatively lower density, KNLN exhibited the highest Pr, d33 and kp at 9.80 μC/cm2,185 pC/N and 0.43 respectively signifying the positive enhancement brought by the co-existence of monoclinic and tetragonal crystal structures. More importantly, this work systematically proved that the co-existence of both structures signified the morphotropic phase boundary (MPB) composition as the primary factor for the enhancement of KNN piezoelectric properties.

Original languageEnglish
JournalCeramics International
DOIs
Publication statusPublished - 1 Jan 2019

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Crystal structure
Substitution reactions
Piezoelectricity
Phase boundaries
Perovskite
Sintering
Chemical analysis
perovskite

Keywords

  • Crystal structure
  • Electro-acoustic
  • Li and Sb
  • MPB

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Piezoelectric enhancements in K0.5Na0.5NbO3-based ceramics via structural evolutions. / Izzuddin, Izura; Mohammad, Mohammad Hafizuddin; Zainuddin, Zalita; Janil, Nor Huwaida.

In: Ceramics International, 01.01.2019.

Research output: Contribution to journalArticle

Izzuddin, Izura ; Mohammad, Mohammad Hafizuddin ; Zainuddin, Zalita ; Janil, Nor Huwaida. / Piezoelectric enhancements in K0.5Na0.5NbO3-based ceramics via structural evolutions. In: Ceramics International. 2019.
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