[001]-texturing of (K, Na)NbO3-based piezoceramics with a pseudocubic structure and their application to piezoelectric devices

Su Hwan Go, Seok Jung Park, Seung Hyun Kim, Seok June Chae, Eun Ji Kim, Geun Su Lee, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

0.96(K0·5Na0.5-zLiz) (Nb0·92Sb0.08)O3-0.04(Ca0·5Sr0.5)ZrO3 [(KN0.5-zLz)NS-CSZ] piezoceramics (0 ≤ z ≤ 0.04) were aligned in the [001] orientation using 3% (in mole) NaNbO3 templates with a large Lotgering factor (>97%). Their crystal structures transformed from the orthorhombic-pseudocubic (O–P) structure to the orthorhombic-tetragonal-pseudocubic (O-T-P) structure with an increasing z. The P structure was interpreted as a rhombohedral R3m structure. The piezoelectricity of the compositions increased after [001]-texturing, and the enhancement was proportional to the O phase quantity. The composition (z = 0.03) exhibited the highest piezoelectric constant (d33; 670 pC/N) and electromechanical coupling factor (kp; 0.56). Piezoelectric energy harvesters were produced using the untextured and textured samples (z = 0.03). The textured harvester delivered a large power density of 26.6 mW/mm3, which was larger than that of the untextured harvester owing to the enhanced kp and d33 × g33 of the textured piezoceramic. A multilayer actuator was produced using the textured sample (z = 0.03), and it exhibited a large acceleration (44.2 G) and displacement (±3,730 μm) at ±25 V. Therefore, the [001]-textured (KN0.47L0.03)NS-CSZ piezoceramic is suitable for piezoelectric energy harvesters and actuators.

Original languageEnglish
JournalJournal of Materiomics
DOIs
Publication statusAccepted/In press - 2023

Bibliographical note

Publisher Copyright:
© 2023 The Authors

Keywords

  • Actuator
  • Energy harvester
  • KNN-Based piezoceramic
  • Lead-free
  • Reactive template grain growth

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Metals and Alloys

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