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Lee, Jae Shin
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article
Hardening behavior and highly enhanced mechanical quality factor in (K0.5Na0.5)NbO3–based ceramics
Abstract
<p>This paper relates the microstructure, crystallographic structure, ferroelectric, and piezoelectric properties of (K<sub>0.5</sub>Na<sub>0.5</sub>)NbO<sub>3</sub> (KNN) ceramics modified with 0.38 mol% K<sub>5.4</sub>Cu<sub>1.3</sub>Ta<sub>10</sub>O<sub>29</sub> (KCT) and different amounts of CuO. Results revealed that the addition of KCT and CuO were effective in enhancing the sinterability of KNN. The internal bias field (E<sub>ib</sub>) increased from 0.3 kV/mm to 0.58 kV/mm at 0.5 mol% CuO–added KNN+KCT ceramics. The increase of E<sub>ib</sub> corresponds very well with the observed increase of the mechanical quality factor (Q<sub>m</sub>) from 112 to 2665 for 0.5 mol% CuO. Besides, addition of 0.5 mol% CuO to KNN+KCT resulted in a large increase of the EPR signal, which is related to the increased amount Cu<sup>2+</sup> and a corresponding increase of the concentration of defect dipoles. This result is in good agreement with the increased E<sub>ib</sub> and the resulting hardening behavior.</p>