Effects of modified-process on the microstructure, internal bias field, and activation energy in CuO-doped NKN ceramics

Yang, Songlan; Hong, Cheng Shong; Tsai, Cheng Che; Liou, Yi Cheng; Chu, Sheng Yuan

doi:10.1016/j.jeurceramsoc.2011.12.008

Cited by 22 publications

(11 citation statements)

References 27 publications

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“…Observing Figure 2b-e, the small grains and large grains are coexisting, and the large grains are increased with increasing the amounts of CuO sintering aids. The results are similar to the previous reports [2][3][4][5][19][20][21][22][23]. Zhou et al and Zhao et al [19] reported that the irregular and large grains are caused by the formation of the inhomogeneous distribution of liquid phase [22].…”

Section: Sem Images and Densitiessupporting

confidence: 91%

Effects of CuO Sintering Aids on Microstructure and Electric Properties for (Na0.48K0.473Li0.04Sr0.007) (Nb0.883Ta0.05Sb0.06Ti0.007)O3 Ceramics

2021

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In this paper, the effects of CuO sintering aids on microstructure and electric properties are investigated for the non-stoichiometric (Na0.48K0.473Li0.04Sr0.007)(Nb0.883Ta0.05Sb0.06Ti0.007)O3+x mol% CuO lead free ceramics. As the amounts of CuO equal 1 mol%, the sintering temperature is 975 °C and the piezoelectric parameters are d33 = 200 pC/N, g33 = 38 (10−3 Vm/N), d33 × g33 = 7600 (10−15 m2/N), kp = 0.38, Qm = 240, Pr = 18.93 μC/cm2 and EC = 8.75 kV/cm. The piezoelectric properties are changed to hard type and suitable for energy harvester with multilayer technology. The physical response mechanisms are suggested that the diffused phase transitions are enhanced, the Cu2+ ions substitute for the B-site ions with forming the Oxygen vacancies and the domain walls are pinning.

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Section: Sem Images and Densitiessupporting

confidence: 91%

Effects of CuO Sintering Aids on Microstructure and Electric Properties for (Na0.48K0.473Li0.04Sr0.007) (Nb0.883Ta0.05Sb0.06Ti0.007)O3 Ceramics

2021

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“…The remnant polarization (P r ) of KNNCu is 6.50 μC cm −2 , which confirms that KNNCu possesses good ferroelectric property (Fig. 1d) [25][26][27][28].…”

Section: Preparation and Characterization Of Knncusupporting

confidence: 53%

Endogenous electric field as a bridge for antibacterial ion transport from implant to bacteria

et al. 2020

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Tissue implant-related infections are among the most serious complications after surgical implantation, including orthopedics and dentistry. Implants with antibacterial ion release systems are efficient and economical antibiotic substitutes to fight against bacterial infections. However, the excessive amount of released antibacterial ions may cause biological toxicity while killing bacteria. This raises a fundamental issue on how to properly control the amounts of ions and their efficacy. Here, we develop low-dose antibacterial ions-incorporated ferroelectric implants (copper-doped potassium sodium niobate, K 0.5 Na 0.5 NbO 3 -Cu, KNNCu) whose surface potential can be tuned via external polarization. The released Cu 2+ ions can be targeted to bacteria via endogenous electric field (EEF) between KNNCu implants and negatively charged bacteria. Intriguingly, the antibacterial efficacy of the implants is determined by the amount of Cu 2+ ions that reaches bacteria, instead of the total amount of released Cu 2+ ions. The amount of Cu 2+ ions reaching bacteria from the high-surface-potential implant is 2.4 times that from the lowsurface-potential implant within 12 h, resulting in the increased antibacterial ratio from about 65% to 100%, while remaining low cell toxicity. This work provides insights into the specific role of the EEF in guiding mass transport between charged materials and living organisms, and a new perspective for the design of high-performance antibacterial biomaterials.

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“…It has been reported that the activation energy for the A‐site cation migration is about 4 eV, and for the B‐site cation transport is around 14 eV in ABO 3 perovskite materials . For oxygen vacancies, it varies from 0.5 to 2 eV, depending on their concentration . The obtained activation energies of the ceramics are around 1 eV, suggesting the presence of oxygen vacancies in the samples.…”

Section: Resultsmentioning

confidence: 99%

“…33 For oxygen vacancies, it varies from 0.5 to 2 eV, depending on their concentration. [33][34][35] The obtained activation energies of the ceramics are around 1 eV, suggesting the presence of oxygen vacancies in the samples. According to Steinsvik et al, 34 the lower activation energy corresponds to the higher concentration of oxygen vacancies at high-temperature range.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Electrical Properties of Nonstoichiometric 0.94(Na_0.5Bi_0.5+x)TiO₃–0.06BaTiO₃Lead‐Free Ceramics

et al. 2015

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0.94(Na0.5Bi0.5+x)TiO3–0.06BaTiO3 (x = −0.04, 0, 0.02; named NB0.46T‐6BT, NB0.50T‐6BT, NB0.52T‐6BT, respectively) lead‐free piezoelectric ceramics were prepared via the solid‐state reaction method. Effects of Bi3+ nonstoichiometry on microstructure, dielectric, ferroelectric, and piezoelectric properties were studied. All ceramics show typical X‐ray diffraction peaks of ABO3 perovskite structure. The lattice parameters increase with the increase in the Bi3+ content. The electron probe microanalysis demonstrates that the excess Bi2O3 in the starting composition can compensate the Bi2O3 loss induced during sample processing. The size and shape of grains are closely related to the Bi3+ content. For the unpoled NB0.50T‐6BT and NB0.52T‐6BT, there are two dielectric anomalies in the dielectric constant–temperature curves. The unpoled NB0.46T‐6BT shows one dielectric anomaly accompanied by high dielectric constant and dielectric loss at low frequencies. After poling, a new dielectric anomaly appears around depolarization temperature (Td) for all ceramics and the Td values increase with the Bi3+ amount decreasing from excess to deficiency. The diffuse phase transition character was studied via the Curie–Weiss law and modified Curie–Weiss law. The activation energy values obtained via the impedance analysis are 0.69, 1.05, and 1.16 eV for NB0.46T‐6BT, NB0.50T‐6BT and NB0.52T‐6BT, respectively, implying the change in oxygen vacancy concentration in the ceramics. The piezoelectric constant, polarization, and coercive field of the ceramics change with the variation in the Bi3+ content. The Rayleigh analysis suggests that the change in electrical properties of the ceramics with the variation in the Bi3+ amount is related to the effect of oxygen vacancies.

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Effects of modified-process on the microstructure, internal bias field, and activation energy in CuO-doped NKN ceramics

Cited by 22 publications

References 27 publications

Effects of CuO Sintering Aids on Microstructure and Electric Properties for (Na0.48K0.473Li0.04Sr0.007) (Nb0.883Ta0.05Sb0.06Ti0.007)O3 Ceramics

Effects of CuO Sintering Aids on Microstructure and Electric Properties for (Na0.48K0.473Li0.04Sr0.007) (Nb0.883Ta0.05Sb0.06Ti0.007)O3 Ceramics

Endogenous electric field as a bridge for antibacterial ion transport from implant to bacteria

Microstructure and Electrical Properties of Nonstoichiometric 0.94(Na_0.5Bi_0.5+x)TiO₃–0.06BaTiO₃Lead‐Free Ceramics

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Effects of modified-process on the microstructure, internal bias field, and activation energy in CuO-doped NKN ceramics

Cited by 22 publications

References 27 publications

Effects of CuO Sintering Aids on Microstructure and Electric Properties for (Na0.48K0.473Li0.04Sr0.007) (Nb0.883Ta0.05Sb0.06Ti0.007)O3 Ceramics

Effects of CuO Sintering Aids on Microstructure and Electric Properties for (Na0.48K0.473Li0.04Sr0.007) (Nb0.883Ta0.05Sb0.06Ti0.007)O3 Ceramics

Endogenous electric field as a bridge for antibacterial ion transport from implant to bacteria

Microstructure and Electrical Properties of Nonstoichiometric 0.94(Na0.5Bi0.5+x)TiO3–0.06BaTiO3Lead‐Free Ceramics

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Microstructure and Electrical Properties of Nonstoichiometric 0.94(Na_0.5Bi_0.5+x)TiO₃–0.06BaTiO₃Lead‐Free Ceramics