Results 201 to 210 of about 126,316 (253)

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +2 more sources

LEAD BARIUM POTASSIUM SODIUM NIOBATE CERAMICS FOR PIEZOELECTRIC APPLICATIONS

International Journal of Modern Physics B, 2008
This paper reports a systematic study of tungsten bronze morphotropic phase boundary (MPB) system Pb 2-2X-3Y/2 Ba 2x RE y K 1-x Na x Nb 5 O 15, where, x = 0.20, 0.25, 0.30, RE = Pr and Bi and y = 0.05 and their structure, microstructure, hysteresis, dielectric, piezoelectric, and Pyroelectric properties.
K. SAMBASIVA RAO, N. VALLISNATH, T. N. V. K. V. PRASAD, K. CH. VARADA RAJULU, B. TILAK, JOON HYUNG LEE   +5 more
openaire   +1 more source

Synthesis and processing of nanosized sodium potassium niobate powders

Materials Science and Technology, 2009
Sodium potassium niobate powders have been produced successfully using a Pechini sol–gel method modified with a novel niobium precursor. The decomposition of the gels produced by this method was observed with thermogravimetric analysis and evolved gas mass spectrometry.
S. A. O'Callaghan, K. M. Knowles
openaire   +1 more source

Facile In Situ Formation of Potassium Sodium Niobate (KNN) Using The Hexaniobate Polyoxometalate.

Chemistry
Lead-based piezoceramics are the dominant materials used in electronic devices, despite the known toxicity of lead. Developing safer piezoelectric materials has inspired the pursuit of lead-free piezoceramics, however some challenges remain in accessing ...
Mark Rambaran, D. Jacobsson, Sebastian Lehmann, Kimberly A. Dick   +3 more
semanticscholar   +1 more source

Growth and characterization of sodium potassium niobate single crystals near morphotropic phase boundaries

Materials Today: Proceedings, 2023
R. Saravanan, R. Perumal, R. Jayavel
semanticscholar   +1 more source

Morphology of potassium sodium niobate based silicate glass system

Electronic Materials Letters, 2013
In this research, the fabrication of lead-free ferroelectric glass-ceramics from the (K0.5Na0.5)NbO3 system via incorporation method was carried out. For the incorporation method, calcined KNN was added into glass batches as a heterogeneous nucleating agent. Glass-ceramics KNNs were prepared from two compositions of KNN-SiO2 with a ratio of 75 : 25 (C1)
Ploypailin Yongsiri, Sukum Eitssayeam, Somnuk Sirisoonthorn, Kamonpan Pengpat   +3 more
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Vibrational spectroscopy of lead-free potassium sodium niobate and related perovskite ferroelectrics

Electronics and Signal Processing
: The potassium sodium niobate (K x Na 1−x )NbO 3 (KNN) family with the perovskite structure is a technologically important lead-free piezoelectric material.
Seiji Kojima
semanticscholar   +1 more source

Phase transitional behavior of potassium sodium niobate thin films

Thin Solid Films, 2013
Abstract Combined X-Ray Diffraction (XRD) and Raman analyses were used to investigate the phase transitions of potassium sodium niobate (K0.5Na0.5)NbO3 thin films, prepared from the acetate–alkoxide based precursor solutions with different amounts of alkali acetate excess.
Alja Kupec, Pascale Gemeiner, Brahim Dkhil, Barbara Malič   +3 more
openaire   +1 more source