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Lemeshko, Mikhail; Nazarenko, Elena; Gonchar, Anastasia; Резниченко, Л. А.; Nedoseykina, Tatiana; Novakovich, A. A.; Mathon, O.; Joly, Yves; Vedrinskiǐ, R. V.

doi:10.1103/physrevb.76.134106

Cited by 14 publications

(12 citation statements)

References 19 publications

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“…On the other hand, an additional triclinic symmetry has been reported for the special case of very small particles of about 130 nm, which is probably due to the cationic ordering of potassium and sodium in the unit cell, induced by the very small number of cells in the particles. Except for normal phase transition detecting techniques such as XRD and Raman spectroscopy, an extended X‐ray absorption fine‐structure analysis was used to determine neighborhood of Nb atom in KNN system, revealing independent Nb displacement with the symmetry of the crystal lattice, which is counterintuitive and may need further investigation …”

Section: Phase Structurementioning

confidence: 99%

(K,Na)NbO₃‐Based Lead‐Free Piezoceramics: Fundamental Aspects, Processing Technologies, and Remaining Challenges

et al. 2013

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Environment‐friendly lead‐free piezoelectric ceramics have been studied extensively in the past decade with great progress particularly in systems based on a niobate perovskite compound formulated as (K, Na)NbO3 (abbreviated as KNN). A comprehensive review on the latest development of KNN‐based piezoelectric ceramics is presented in this article, including the phase structure, property enhancement approaches, and sintering processes as well as the status of some promising applications. The phase structure of KNN was reexamined and associated with the effect of chemical modification on its tetragonal‐to‐orthorhombic transition. Then, a special focus is placed on the temperature dependence of piezoelectric properties of KNN‐based ceramics, followed by reviewing the recent approaches devoted to the temperature‐stability enhancement. The processing fundamentals related to the sintering of KNN‐based ceramics are also presented with an emphasis on compositional and microstructural control. Finally, this review introduces several industrial attempts of traditional piezoceramic products using KNN‐based ceramics and the studies on some promising application in authors' laboratory.

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Section: Phase Structurementioning

confidence: 99%

(K,Na)NbO₃‐Based Lead‐Free Piezoceramics: Fundamental Aspects, Processing Technologies, and Remaining Challenges

et al. 2013

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“…In addition, the EXAFS measurement allows the identification of the nearest neighboring atoms to the absorbing atom to determine the coordination environment for the metal of interest [26]. Recently, both techniques have been successfully applied to various classes of materials to obtain their local structures [27][28][29][30][31][32][33][34][35]. Our previous experimental and theoretical works on applying the XAS techniques to determine the local structure of PZT-based materials have already been established [36][37][38].…”

Section: -Based Materialsmentioning

confidence: 99%

Identification of Mn Site in BaTiO₃by Synchrotron X-Ray Absorption Spectroscopy Measurements

et al. 2009

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In this work, an X-ray Absorption Spectroscopy (XAS) measurement was employed to determine the local structure of Mn in BaTiO 3 . A combination of Synchrotron X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EX-AFS) experiments was performed on Mn-doped BaTiO 3 samples. The BaTi 1 -x Mn2) were used for the XAS experiment. XAS spectra at the Mn K-edge were recorded in transmission mode. The spectra were collected at ambient temperature with a Ge(111) double crystal monochromator and recorded after performing an energy calibration. The features of the measured Mn K-edge XANES and EXAFS were both consistent with Mn on the Ti site and inconsistent with Mn on other sites. In addition, the dielectric and ferroelectric properties results also supported the possible Mn T i substitution in BaTiO 3 material. The clear agreement between the two measured synchrotron XAS spectra, as well as supporting electrical results, was by far the strongest evidence of Mn substituting for Ti in BaTiO 3 structure.

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“…The same approach has been used by Lemeshko et al 8,9 to study alkali niobates in an extremely wide temperature range and for several values of K/Na atomic ratio. The authors start from a hypothesized spherical shell of Nb atom loci and determine the distribution of actual positions in this model for the entire range of crystallographic phases of the material, limiting the analysis mostly to the first-neighbor shell.…”

Section: Introductionmentioning

confidence: 95%

Extended x-ray absorption fine structure study of phase transitions in the piezoelectric perovskite K0.5Na0.5NbO3

Kodre

Tellier

Arčon

et al. 2009

Journal of Applied Physics

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Following an x-ray diffraction study of phase transitions of the piezoelectric perovskite K 0.5 Na 0.5 NbO 3 the structural changes of the material are studied using extended x-ray absorption fine structure analysis, whereby the neighborhood of Nb atom is determined in the temperature range of monoclinic, tetragonal, and cubic phases. Within the entire range Nb atom is displaced from the center of the octahedron of its immediate oxygen neighbors, as witnessed by the splitting of Nb-O distance. The model shows high prevalence of the displacement in the ͑111͒ crystallographic direction of the simple perovskite cell. The corresponding splitting of the Nb-Nb distance is negligible. There is no observable disalignment of the linear Nb-O-Nb bonds from the ideal cubic arrangement, judging from the intensity of the focusing of the photoelectron wave on the Nb-Nb scattering path by the interposed oxygen atom. As a general result, the phase transitions are found as an effect of the long-range order, while the placement of the atoms in the immediate vicinity remains largely unaffected.

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EXAFS studies of the local atomic structure of the lead-free piezoelectric ceramicsKxNa1−xNbO3<

Cited by 14 publications

References 19 publications

(K,Na)NbO₃‐Based Lead‐Free Piezoceramics: Fundamental Aspects, Processing Technologies, and Remaining Challenges

(K,Na)NbO₃‐Based Lead‐Free Piezoceramics: Fundamental Aspects, Processing Technologies, and Remaining Challenges

Identification of Mn Site in BaTiO₃by Synchrotron X-Ray Absorption Spectroscopy Measurements

Extended x-ray absorption fine structure study of phase transitions in the piezoelectric perovskite K0.5Na0.5NbO3

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EXAFS studies of the local atomic structure of the lead-free piezoelectric ceramicsKxNa1−xNbO3<

Cited by 14 publications

References 19 publications

(K,Na)NbO3‐Based Lead‐Free Piezoceramics: Fundamental Aspects, Processing Technologies, and Remaining Challenges

(K,Na)NbO3‐Based Lead‐Free Piezoceramics: Fundamental Aspects, Processing Technologies, and Remaining Challenges

Identification of Mn Site in BaTiO3by Synchrotron X-Ray Absorption Spectroscopy Measurements

Extended x-ray absorption fine structure study of phase transitions in the piezoelectric perovskite K0.5Na0.5NbO3

Contact Info

Product

Resources

About

(K,Na)NbO₃‐Based Lead‐Free Piezoceramics: Fundamental Aspects, Processing Technologies, and Remaining Challenges

(K,Na)NbO₃‐Based Lead‐Free Piezoceramics: Fundamental Aspects, Processing Technologies, and Remaining Challenges

Identification of Mn Site in BaTiO₃by Synchrotron X-Ray Absorption Spectroscopy Measurements