Results 171 to 180 of about 3,350 (215)

Hydrothermal Synthesis of Sodium-Potassium Niobate Nanopowders

Key Engineering Materials, 2008
Sodium-potassium Niobate (K0.4Na0.6NbO3, KNN) nanopowders were prepared by hydrothermal synthesis at the temperature range of 140-180°C for 12-48h using Nb2O5, NaOH and KOH as source materials. By means of XRD and SEM techniques, the effects of composition and hydrothermal treatment process, such as the rate of [R]/[Nb], the concentration of the alkali,
Shi Ping Wang, Hong Yan Miao, Guo Qiang Tan   +2 more
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Electrical properties of piezoelectric sodium-potassium niobate

Journal of the European Ceramic Society, 2004
Piezoelectric material is one of the most important components of the micro-electro mechanical system (MEMS). Most piezoelectrics have useful multi-functions for MEMS, e.g. sensor, actuator and transducer. An AFM cantilever, scanning mirror device and pumping system for a micro-chamber, are the typical applications of piezoelectric material on MEMS ...
M. Ichiki, L. Zhang, M. Tanaka, R. Maeda
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Giant Piezoelectricity in Potassium–Sodium Niobate Lead-Free Ceramics

Journal of the American Chemical Society, 2014
Environment protection and human health concern is the driving force to eliminate the lead from commercial piezoelectric materials. In 2004, Saito et al. [ Saito et al., Nature , 2004 , 432 , 84 . ] developed an alkali niobate-based perovskite solid solution with a peak piezoelectric constant d33 of 416 pC/N when prepared in the textured ...
Xiaopeng, Wang, Jiagang, Wu, Dingquan, Xiao, Jianguo, Zhu, Xiaojing, Cheng, Ting, Zheng, Binyu, Zhang, Xiaojie, Lou, Xiangjian, Wang   +8 more
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Superior Electrostrictive Effect in Relaxor Potassium Sodium Niobate Based Ferroelectrics

ACS Applied Materials & Interfaces, 2020
Electromechanical actuators with toxic lead-based electrostrictive materials dominate the market of high-precision electronics devices, so one of urgent aims becomes how to explore the new generation of ecofriendly electrostrictive materials with superior electrostriction behaviors.
Bo Wu, Chunlin Zhao, Yanli Huang, Jie Yin, Wenjuan Wu, Jiagang Wu   +5 more
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Phase transition of potassium sodium niobate under high pressures

Applied Physics Letters, 2023
As a piezoelectric material, K0.5Na0.5NbO3 (KNN) has broad application prospects in ultrasonic transducers, sensors, and biomedicine areas. Its structure information under high pressures is of great significance for guiding device design. In this study, the high-pressure structural evolution of KNN has been studied.
Zhangyang Zhou, Leiming Fang, Zhengwei Xiong, Youjun Zhang, Yixuan Liu, Gaomin Liu, Yi Liu, Ruiqi He, Tiexin Han, Jun Li, Ke Wang, Zhipeng Gao   +11 more
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Sodium-potassium niobates and tantalates

Journal of Inorganic and Nuclear Chemistry, 1961
Abstract A mixed alkali metal niobate, Na4K4Nb6O19·9H2O and a tantalate, Na3K5Ta6O19·10H2O were isolated by crystallization from sodium hydroxide-potassium hydroxide solutions. Their compositions were determined by chemical analyses, and their existence as well-defined phases was demonstrated by phase plots and powder diffraction patterns.
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Dielectric Properties of Sodium and Potassium Niobates

Physical Review, 1951
The following paper deals with evidence of ferroelectricity in KNb${\mathrm{O}}_{3}$ and NaNb${\mathrm{O}}_{3}$. Temperatures at which both materials undergo crystallographic changes and corresponding changes in dielectric constant and loss tangent are reported.
B. T. Matthias, J. P. Remeika
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Textured Potassium Sodium Niobate Ceramics Doped with Copper and Manganese

Microscopy and Microanalysis, 2015
21 Suppl ...
Pinho, R, Costa, M E, Vilarinho, P M
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Characterizations of Sodium Modified Potassium Lithium Niobate Crystal

Ferroelectrics, 2009
Na modified potassium lithium niobate Na 0.23 K 2.60 Li 1.82 Nb 5.35 O 15 (NKLN) crystal has the completely filled tetragonal tungsten bronze structure. Its spontaneous polarization was considered to be P 1 = P 2 = 0 and P 3 2 ≠ 0 below the Curie temperature of 480°C.
Byeong-Eog Jun, Yoon-Hwae Hwang, Hyung-Kook Kim, Byung Chun Choi, Byung Kee Moon, Jung Hyun Jeong, Jae-Hyeon Ko   +6 more
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Dielectric properties of potassium sodium niobate mixed system

Materials Research Bulletin, 2001
Abstract Ceramic pellets of Potassium Sodium Niobate (K x Na 1−x NbO 3 ) system have been prepared using solid solution reaction method. The prepared samples were characterized using X-ray diffraction method and grain size have been calculated using SEM photographs.
Kuldeep Singh, Vijendra Lingwal, S.C. Bhatt, N.S. Panwar, B.S. Semwal   +4 more
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