Results 181 to 190 of about 3,350 (215)

Synthesis and Properties of Modified Potassium-Sodium Niobate Ceramics

Russian Journal of Inorganic Chemistry, 2021
The effect of modification (in the А and В sublattices) on the crystal structure parameters, microstructure, and dielectric and local piezoelectric properties of perovskite ceramics (1 – x)(K0.5Na0.5)NbO3–xLa(Ag0.5Sb0.5)O3 was studied. At increased concentration of the second component, the lattice volume and average grain diameter decreased, and the ...
Politova, E. D., Kaleva, G. M., Mosunov, A. V., Sadovskaya, N. V., Il’ina, T. S., Kiselev, D. A., Shvartsman, Vladimir   +6 more
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Shifting the phase boundary: Potassium sodium niobate derivates

MRS Bulletin, 2018
Abstract
Ke Wang, Barbara Malič, Jiagang Wu
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SYNTHESIS AND CHARACTERIZATION OF POTASSIUM SODIUM NIOBATE PHASES

International Journal of Modern Physics B, 2008
Potassium niobate KNbO 3 and some compounds of ( K 1-x Na x) NbO 3 (x = 0.3, 0.4, 0.6, 0.7) ceramics powders were successfully prepared by the solid-state reaction method using a non-stoichiometric mixture of starting materials. A possible formation of these phases was proposed based on the experimental results.
N. BOUTAOUI, A. BENABBES, K. RAMDANE
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Modified lead-free potassium sodium niobate (KNN) and their properties

2012 IEEE International Ultrasonics Symposium, 2012
In this study, effects of lithium and tantalum modification on the structural and dielectric properties of potassium sodium niobate (KNN) ceramics were investigated. All ceramics were fabricated by pressureless sintering technique. Li, Li-Ta modifications were improved densification and thus dielectric properties. The dielectric properties of Li and Ta
Alkoy, Ebru Mensur, Yavuz, Ayse Berksoy, Alkoy, Sedat   +2 more
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Superior Piezoelectric Properties in Potassium–Sodium Niobate Lead‐Free Ceramics

Advanced Materials, 2016
A superior piezoelectric coefficient (d33 = 570 ± 10 pC N"1 ), the highest value reported to date in potassium-sodium niobate-based ceramics, is obtained in (1-x-y)K1-w Naw Nb1-z Sbz O3-y BaZrO3-x - Bi0.5 K0.5 HfO3 ceramics. This high d33 value can be ascribed to the co-existence of "nano-scale strain domains" (1-2 nm) and a high density of ...
Xu, Kai, Li, Jun, Lv, Xiang, Wu, Jiagang, Zhang, Xixiang, Xiao, Dingquan, Zhu, Jianguo   +6 more
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Electrical properties of sodium potassium niobate/mullite ceramic composites

Ferroelectrics, 2017
ABSTRACTIn the present study, the composites between KNN and mullite were fabricated via a solid-state reaction technique. KNN was calcined at 900°C and mullite which synthesized from kaolinite (Ranong, Thailand) was calcined at 1300°C. Effects of KNN content on the composites properties such as densification and electrical properties including ...
Narumon Lertcumfu, Pharatree Jaita, Kamonpan Pengpat, Sukum Eitssayeam, Denis Russell Sweatman, Tawee Tunkasiri, Gobwute Rujijanagul   +6 more
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Doping Modification Of Photorefractive Crystal Potassium Sodium Strontium Barium Niobate

Conference on Lasers and Electro-Optics Europe, 1996
During recent year, the photorefractive materials are attractive in many applications such as optical image processing and optical computing because they have more lower threshold power and easily realize phase conjugation Potassium sodium strontium barium niobate crystal is one of the best candidates.
H.C. Chen, Q.Z. Jiang, X.L. Lu, L. Chen
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High-performance potassium sodium niobate piezoceramics for ultrasonic transducer

Nano Energy, 2020
Abstract Ultrasonic transducers can be used as medical diagnostic imaging and nondestructive testing. This work presents phase structure engineered high-performance potassium sodium niobate [(K,Na)NbO3, KNN]-based ceramics and its potential application on ultrasonic transducer.
Ting Zheng, Yang Zhang, Qingqing Ke, Haijun Wu, Liew Weng Heng, Dingquan Xiao, Jianguo Zhu, Stephen J. Pennycook, Kui Yao, Jiagang Wu   +9 more
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Morphotropic Phase Transitions in Mixed Sodium-Potassium Niobate System

Ferroelectrics, 2004
Ceramic pellets of different compositions of Na 1−xKxNbO 3 system (x = 0 to 0.5) have been prepared using ‘solid-state reaction’ method. Pellets of 6 mm diameter have been prepared under two conditions; first, the calcined mixtures were pressed at 0.2 MPa and sintered in a tube furnace opened at both ends; and second, the calcined mixtures were pressed
VIJENDRA LINGWAL, N. S. PANWAR
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POTASSIUM-SODIUM-RUBIDIUM NIOBATE SINGLE CRYSTALS AND ELECTRIC PROPERTIES

International Journal of Modern Physics B, 2009
Potassium-sodium-rubidium niobate single crystals are grown using an original pulling down method, to improve their composition change during a crystal growth, by means of co-doping of small ionic size sodium and large ionic size rubidium into potassium niobate. Even by the co-doping, single crystals can be grown with orthorhombic single-phase at room
Kimura, Hideo, Tanahashi, R, Maiwa, K, Baba, H, Cheng, Zhenxiang, Wang, Xiaolin   +5 more
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