Superior piezoelectric properties of lead-free thick-films and their application to alternative multilayer actuator

Seok June Chae, Tae Gon Lee, Dae Su Kim, Sun Woo Kim, Eun Ji Kim, Sung Mean Park, Woo Seok Kang, Sang Jin Lee, Chong Yoon Kang, Sahn Nahm

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

CuO-added 0.97(Li0.04Na0.46K0.5)(Nb0.89Sb0.11)O3-0.03CaZrO3 (CLNKNS-CZ) thick-films synthesized at 1060 °C exhibit a dense microstructure comprising small grains and abnormally grown large grains. They have an orthorhombic-tetragonal polymorphic phase boundary structure and exhibit good piezoelectric properties: d33 = 488 pC/N and kp = 0.45. They have a large electric-field induced strain (0.16% at 4.0 kV/mm) which was maintained at 100 °C, whereas the strain decreased slightly to 0.15% at 150 °C. Moreover, a large strain was maintained after 106 electric-field cycles with a maximum electric field of 1.0 kV/mm. Hence, CLNKNS-CZ thick-films exhibit thermally stable strain with good fatigue properties. We synthesized multilayer ceramics comprising five layers of CLNKNS-CZ thick-films and 70Ag–30Pd electrodes with sharp interfaces between ceramic layers and electrodes. Cantilever-type CLNKNS-CZ actuators showed a large displacement (2.5 mm) and acceleration (33.4 G) at 25 V, and similar results were obtained via simulation. Furthermore, the actuating properties of CLNKNS-CZ actuators are comparable to those of PZT-based actuators.

Original languageEnglish
Article number155079
JournalJournal of Alloys and Compounds
Volume834
DOIs
Publication statusPublished - 2020 Sep 5

Keywords

  • Actuator
  • Lead free
  • Multilayer
  • Piezoelectric ceramic
  • Thick film

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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