Results 161 to 170 of about 3,350 (215)

Ultraselective sequestration of Li⁺ and Mg²⁺ from brines via a reusable polyoxoniobate-based ion sponge. [PDF]

Sci Adv
Chen L, Li C, Adibnia S, Yang S, Li J, Samolova E, Dopilka A, Huang Z, Giovine R, Fleming XB, Guo J, Haddad AZ, Kostecki R, Chen W, Dun C, Urban JJ.   +15 more
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Phase transitions in sodium niobate-potassium niobate solid solutions

Ferroelectrics, 1974
Abstract Studies of the crystal structures of some phases in the NaxK1-xNbO3 system have been made by considering the possible tilting of the oxygen octahedra. It has been found that at room temperature the phases bear simple geometrical relationships to one another, and this has led to speculation about the high-temperature phases.
M. Ahtee, A. M. Glazer
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Electron Microscopy Studies of Potassium Sodium Niobate Ceramics

Microscopy and Microanalysis, 2005
Using electron microscopy, K0.5Na0.5NbO3 (KNN) ceramics sintered at 1030°C for 8 h and 1100°C for 2 and 24 h was studied. The scanning electron microscopy and X-ray spectrometry revealed that the materials consisted of a matrix phase in which the (Na+K)/Nb ratio corresponded closely to the nominal composition and a small amount of Nb-rich ...
Darja, Jenko, Andreja, Bencan, Barbara, Malic, Janez, Holc, Marija, Kosec   +4 more
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Incommensurate phases in lead potassium niobate and lead sodium niobate, homologues of barium sodium niobate.

Solid State Communications, 1986
Abstract Electron diffraction and high resolution electron microscopy reveal the presence of incommensurate structures in lead potassium niobate, lead sodium niobate and in mixed crystals. The incommensurability can be described either as being due to the presence of quasi-periodic “diffuse” anti-phase boundaries or as being due to the presence of ...
C. Manolikas, G. Van Tendeloo, S. Amelinckx   +2 more
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Hot Pressing of Potassium‐Sodium Niobates

Journal of the American Ceramic Society, 1962
Compositions in the system KNbO 3 ‐NaNbO 2 have been hot‐pressed to yield ceramics with relative densities greater than 99%. Because these materials lack any degree of pyroplastic behavior, temperatures approaching those required for air sintering are ...
R. E. JAEGER, L. EGERTON
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High-temperature phases of sodium niobate-potassium niobate solid solutions

Ferroelectrics, 1976
The high-temperature phases of NaNbO3-KNbO3 solid solutions consisting of 10, 20 and 35 mole % potassium were studied up to 800 K with the aid of a high-temperature furnace connected to an x-ray diffractometer. From the measurements of the lattice parameters and the intensities of some weak difference reflections as a function of temperature the tilt ...
M. Ahtee, A. M. Glazer
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Sensing and actuating applications of potassium sodium niobate: Use of potassium sodium niobate in sensor and actuator

2013 Seventh International Conference on Sensing Technology (ICST), 2013
Many ceramics have been studied due to their importance in the fabrication of multilayer ceramic capacitors and actuators. Potassium Sodium Niobate (K0.5Na0.5NbO3) is one of the most promising candidate of lead free piezoelectric ceramics used in sensors and actuators. K0.5Na0.5NbO3 (KNN) was successfully synthesized by solid state reaction method.
Asha Dahiya, O. P. Thakur, J. K. Juneja
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DIELECTRIC PROPERTIES OF SODIUM POTASSIUM NIOBATE TITANATE CERAMICS

Transactions of the Kоla Science Centre of RAS. Series: Engineering Sciences, 2023
The paper considers the preparation of potassium sodium niobate ceramics doped with titanium in an amount of 5 mol. %. The structure and dielectric properties were investigated in the temperature range 30–650 °C. It is shown that acceptor doping leads to a decrease in the grain size. Violation of stoichiometry in the anionic sublattice contributes to a
Ekaterina V. Barabanova, Sergej E. Kondratev, Aleksandra I. Ivanova   +2 more
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Sodium potassium niobate-based lead-free piezoelectric ceramics

2021
Due to the toxicity of lead, there is an urgent need to develop lead-free alternatives to replace the currently dominant lead-based piezoelectrics such as lead zirconate titanate (PZT). (Na_[0.5]K_[0.5])NbO₃ (NKN)-based piezoelectrics are promising because of their relatively high Curie temperatures and piezoelectric coefficients among the non-lead ...
Huidong Li, Wei-Heng Shih, Wan Y. Shih
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