Effect of NiO Sintering Aid on the Electrical Properties of KNN-LST Lead-free Piezoceramics

Articles in Press

Document Type : Original Research Article

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Faculty of Engineering, Shahrekord University, Shahrekord, Chaharmahal and Bakhtiari, Iran

Abstract

The paper focuses on the synthesis and characterization of sodium potassium niobate (KNN), a lead-free piezoelectric compound. The objective is to replace lead-based compounds like PZT by utilizing KNN-LST, which is sodium potassium niobate piezoceramic powder doped with lithium, antimony, and tantalum. The solid-state method was employed to sinter samples at 1110 °C with varying percentages of NiO sinter aid (0%, 0.75%, 1.5%, and 2.25%). X-ray diffraction analysis revealed the formation of pure KNN-LST perovskite phase at 1110 °C with a composition containing 1.5% NiO. Scanning electron microscope images demonstrated that cubic particles inherent in KNN were observed in samples with no NiO addition as well as those containing 0.75% and 1.5% NiO; however, these transformed into cylindrical grains when incorporating 2.25% NiO. With an increase in the sintering percentage from zero NiO content to higher amounts, sample density exhibited an upward trend from approximately 85% to its peak at around94%, followed by a slight decrease to about91%. Similarly, the dielectric coefficient increased from approximately850 without any contribution from NiO sinter addition up to1500 when using1.5%NiOsinter addition but then decreased again reaching around1200with a2.25%NiOsinter addition. Conversely, dielectric loss initially reduced from roughly0.14%during no NiOsinter addition down to merely0.04%during1.

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Advanced Ceramics Progress

Articles in Press, Accepted Manuscript
Available Online from 30 September 2023

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History

  • Receive Date: 02 September 2023
  • Revise Date: 25 September 2023
  • Accept Date: 27 September 2023

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