Structural dependence of piezoelectric, dielectric and ferroelectric properties of K0.5Na0.5(Nb1−2/5Cu )O3 lead-free ceramics with high Q

Tan, Xiaohui; Fan, Huiqing; Ke, Shanming; Zhou, Li; Mai, Yiu‐Wing; Huang, Haitao

doi:10.1016/j.materresbull.2012.09.049

Cited by 37 publications

(24 citation statements)

References 27 publications

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“…Oxygen vacancies have received close attention in perovskite oxide research because vacancy movement is generally considered as a source of hardening, aging, and fatigue, and the presence and regulation of oxygen vacancies obviously affect the material properties. In recent years, special double polarization hysteresis loops have been found for several doped titanates, doped K 0.5 Na 0.5 NbO 3 (KNN)‐based ceramics, and Fe‐doped KTa 0.57 Nb 0.43 O 3 single crystals . Defect dipoles, which are composed of doped ions and oxygen vacancies originating from the valence mismatch of dopant ions, were found to be an important factor affecting the ferroelectric domain state.…”

Section: Introductionmentioning

confidence: 99%

Defect dipole evolution and its impact on the ferroelectric properties of Fe‐doped KTN single crystals

et al. 2019

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The ferroelectric and piezoelectric properties of doped potassium tantalum niobate crystals with different Fe doping amounts and the adjustability of the properties are investigated. The hysteresis loops and current density curves show that the defect dipoles have an obvious effect on domain reorientation, and the effect decreases with increasing doping amount. The ferroelectric and piezoelectric properties can be adjusted via the defect dipoles, and the adjustability is reduced with increasing doping amount. A change of the doping amount leads to defect dipole structure evolution in the crystals, in which the defect dipoles transform from a polar structure to a nonpolar structure, which is the reason for the transition of the domain reorientation determined by the defect dipoles. This result has proved that introducing defects is an effective way to improve and regulate perovskite properties, and the doping amount is one of the important factors controlling the defect dipoles.

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Section: Introductionmentioning

confidence: 99%

Defect dipole evolution and its impact on the ferroelectric properties of Fe‐doped KTN single crystals

et al. 2019

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“…According to previous studies, when a small amount of Cu 2+ ions (<1.0 mol%) substituted the Nb 5+ ions in (K 0.5 Na 0.5 )NbO 3 ceramics, the defect complex

{false({Cu}_{normalNb}^{″'} - V_{normalo}^{\cdot \cdot} false)}^{'}

was formed. Moreover, a P D was formed between the acceptor ion (

{Cu}_{normalNb}^{″'}

) and oxygen vacancy (

V_{normalo}^{\cdot \cdot}

) along the <001> direction . Therefore, it is considered that the P D between the

{Cu}_{normalNb}^{″'}

and

V_{normalo}^{\cdot \cdot}

could be formed in the CuO‐added (L x K 0.9− x N 0.1 )N ceramics along the <001> direction.…”

Section: Resultsmentioning

confidence: 99%

Effect of Li₂O on the defect polarization in CuO‐added (K_0.9Na_0.1)NbO₃ piezoelectric ceramics

et al. 2017

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CuO-added (Li x K 0.9Àx Na 0.1 )NbO 3 [C(L x K 0.9Àx N 0.1 )N] ceramics with 0.0≤x≤0.05 were well-sintered at 960°C for 6 hours. The lattice parameters of the specimens decreased with the addition of Li 2 O. Defect polarization (P D ) formed between Cu 2+ ions and oxygen vacancies. Double polarization vs electric field (P-E) hysteresis and sprout-shaped strain vs electric field (S-E) curves were observed in these specimens with a large strain of 0.16% at 7.0 kV/mm, possibly owing to the presence of P D . When the P-E curve was measured at temperatures higher than 75°C, the C(K 0.9 N 0.1 )N ceramic exhibited a normal P-E hysteresis curve, whereas the C(L 0.04 K 0.86 N 0.1 )N ceramic maintained the double P-E hysteresis curve up to 125°C, indicating that Li 2 O increased the thermal stability of P D . The latter specimen also showed the sprout shaped S-E curve with a strain of 0.15% at 7.0 kV/mm after 10 4 cycles of a high electric field of 7.0 kV/mm.

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“…A double hysteresis loop is a typical characteristic of antiferroelectric materials because of the antiferroelectric‐ferroelectric phase transition . However, a series of doped titanates after aging and doped K 0.5 Na 0.5 NbO 3 (KNN)‐based ceramics have also been found to exhibit a double polarization hysteresis loop. The stability of the ferroelectric domain is widely believed to be affected by defect dipoles, and a mechanism involving symmetry conforming of point defects was proposed for a double hysteresis loop below T c in ferroelectrics doped with valence mismatching ions .…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have largely focused on the symmetry‐conforming property of point defects and the effect of defect dipoles on the domain reorientation. The latter effect also significantly affects the performance of the materials . In particular, an extremely high electrostrain was achieved in doped titanates, and a very high mechanical quality factor was found in Cu‐doped KNN ceramics .…”

Section: Introductionmentioning

confidence: 99%

Discovery and evolution of double P‐E loops in a tetragonal Fe‐doped KTa_0.57Nb_0.43O₃ single crystal

Cao

Tian

et al. 2018

J Am Ceram Soc

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Double polarization‐electric field (P‐E) loops were observed in Fe‐doped KTa0.57Nb0.43O3 (Fe‐KTN) crystals because of the restraining effect of the defect dipoles on domain reorientation. In Fe‐KTN crystals, the positively charged O2− vacancies and negatively charged dopant Fe3+ ions form defect dipoles, providing a restoring force for domain reorientation. Moreover, built‐in macro‐polarization was observed depending on the orientation of the defect dipole polarization. The response of the defect dipoles to an external electric field and the evolution of the double P‐E loops were investigated. The restraining effect of the defect dipoles on domain reorientation was found to affect normal piezoelectric activities. The domains could maintain the state close to the polarization direction, resulting in an extremely high d33 value (287 pC/N).

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Structural dependence of piezoelectric, dielectric and ferroelectric properties of K0.5Na0.5(Nb1−2/5Cu )O3 lead-free ceramics with high Q

Cited by 37 publications

References 27 publications

Defect dipole evolution and its impact on the ferroelectric properties of Fe‐doped KTN single crystals

Defect dipole evolution and its impact on the ferroelectric properties of Fe‐doped KTN single crystals

Effect of Li₂O on the defect polarization in CuO‐added (K_0.9Na_0.1)NbO₃ piezoelectric ceramics

Discovery and evolution of double P‐E loops in a tetragonal Fe‐doped KTa_0.57Nb_0.43O₃ single crystal

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Structural dependence of piezoelectric, dielectric and ferroelectric properties of K0.5Na0.5(Nb1−2/5Cu )O3 lead-free ceramics with high Q

Cited by 37 publications

References 27 publications

Defect dipole evolution and its impact on the ferroelectric properties of Fe‐doped KTN single crystals

Defect dipole evolution and its impact on the ferroelectric properties of Fe‐doped KTN single crystals

Effect of Li2O on the defect polarization in CuO‐added (K0.9Na0.1)NbO3 piezoelectric ceramics

Discovery and evolution of double P‐E loops in a tetragonal Fe‐doped KTa0.57Nb0.43O3 single crystal

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Effect of Li₂O on the defect polarization in CuO‐added (K_0.9Na_0.1)NbO₃ piezoelectric ceramics

Discovery and evolution of double P‐E loops in a tetragonal Fe‐doped KTa_0.57Nb_0.43O₃ single crystal