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Open AccessArticle

Preparation and Dielectric Properties of K1/2Na1/2NbO3 Ceramics Obtained from Mechanically Activated Powders

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Institute of Materials Science and Engineering, Poznań University of Technology, Jana Pawła II 24, 61-138 Poznań, Poland
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Faculty of Science and Technology, University of Silesia, Institute of Materials Engineering, 12, Zytnia Str., 41-200 Sosnowiec, Poland
*
Author to whom correspondence should be addressed.
Materials 2020, 13(2), 401; https://doi.org/10.3390/ma13020401
Received: 28 November 2019 / Revised: 8 January 2020 / Accepted: 9 January 2020 / Published: 15 January 2020
(This article belongs to the Special Issue Electroceramic Materials)
Alkaline based materials have been considered as a replacement for environmentally harmful Pb(Zr,Ti)O3 (PZT) electro-ceramics. In this paper, the K1/2Na1/2NbO3 (KNN) ceramics were prepared in a three stage process: first Nb2O5, Na2CO3, and K2CO3 were milled in a high energy mill (shaker type) for different periods, between 25 h and 100 h, consecutively a solid state reaction was carried out at 550 °C. Finally, the uniaxially pressed samples were sintered at 1000 °C. The reaction temperature is lower for mechanically activated powders than in the case of the conventional solid-state method. The ceramic samples, prepared from the mechanically activated powders, were investigated by dielectric spectroscopy. The influence of the duration of the mechanical activation on the properties of the ceramic materials, e.g., ceramic microstructures, phase transition temperatures, character of the temperature dependences of dielectric permittivity, are discussed. View Full-Text
Keywords: lead-free materials; perovskites; mechanical activation; potassium sodium niobate; dielectric properties lead-free materials; perovskites; mechanical activation; potassium sodium niobate; dielectric properties
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MDPI and ACS Style

Szafraniak-Wiza, I.; Dzik, J.; Bochenek, D.; Szalbot, D.; Adamczyk-Habrajska, M. Preparation and Dielectric Properties of K1/2Na1/2NbO3 Ceramics Obtained from Mechanically Activated Powders. Materials 2020, 13, 401.

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