Technology and electrophysical properties of the (K0.44Na0.52Li0.04)(Nb0.9–xTa0.1Sbx)O3 ceramics

Bochenek, Dariusz; Osińska, K; Niemiec, Przemysław; Adamczyk, M.; Goryczka, Tomasz

doi:10.1080/17436753.2019.1595263

Cited by 4 publications

(2 citation statements)

References 41 publications

(50 reference statements)

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“…Similar anomalies were shown in similar NKN-based materials. 27,28) A possible explanation is the increased amount of oxygen vacancies. The higher concentration of Zr dopants promotes the occurrence of oxygen vacancies, which in turn become more mobile at elevated temperatures.…”

Section: Resultsmentioning

confidence: 99%

Stress dependent impedance spectroscopy of niobium based ceramics

Tanaka,

Nozaki,

Martin

et al. 2023

Jpn. J. Appl. Phys.

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In this study, stress-dependent impedance spectra were characterized as a function of uniaxial compressive stress up to –300 MPa for Zr-doped (Na0.55K0.45)(Nb1-x/125Zrx/100)O3-δ (x =5, 10 mol%). This allowed for the evaluation of the stress-induced changes in the grain and grain boundary capacitance. The grain capacitance from equivalent circuit fitting exhibited decreasing behavior with increasing uniaxial compressive stress increased, which is attributed to hindered domain wall movement reducing the extrinsic contributions. Interestingly, NKNZ10 showed a more significant degradation in grain capacitance than NKNZ5. One possible explanation is the difference in oxygen vacancies, and by extension defect dipoles, when introducing Zr into the lattice. As such, this study reveals the amplifying effect of oxygen vacancies on the mechanical suppression of domain wall movement.

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Section: Resultsmentioning

confidence: 99%

Stress dependent impedance spectroscopy of niobium based ceramics

Tanaka,

Nozaki,

Martin

et al. 2023

Jpn. J. Appl. Phys.

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“…Also, the evaporation of PbO during technological processes and the difficulty of recycling and utilizing this type of ceramic materials has a negative impact on the environment and is a serious threat to the health of humans and animals [1][2]5]. All these negative phenomena cause the need to search for new lead-free ferroelectric materials with functional properties similar to the widely used PZT, which will be an alternative thereof [6][7].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Bochenek,

Osińska,

Mankiewicz

et al. 2020

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The paper presents the technology and basic properties of three compositions of lead-free ceramics: (i) (K 0.44 Na 0.52 Li 0.04 ) NbO 3 , (ii) (K 0.44 Na 0.52 Li 0.04 )NbO 3 +0.5%mol Nd 2 O 3 and (iii) (K 0.44 Na 0.52 Li 0.04 )NbO 3 +0.5%mol Pr 2 O 3 . Powders of the designed compositions based on KNLN were obtained with the classic ceramic technology, as a result of solid phase synthesis, from a mixture of simple oxides and carbonates. The synthesis of ceramic powders was carried out at T s = 900°C for t s = 4 h, while compaction by free sintering at T sint = 1100°C for t sint = 2 h.XRD studies have shown that doping with praseodymium and neodymium promotes the formation of the tetragonal phase in the base composition (K 0.44 Na 0.52 Li 0.04 )NbO 3 at lower temperatures. On the other hand, microstructural tests have shown that the admixture of neodymium and praseodymium improves the sinterability of ceramic samples during the technological process; however, the ceramic samples still exhibit high porosity.

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