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Preparation of Transparent Microspheres in the K0.5Na0.5NbO3 System by Laser Fusing
F.J. Hmood, C. Oelgardt, R. Görke, J.G. Heinrich
University of Technology Clausthal, Department for Engineering Ceramics, Zehntnerstr. 2a, 38678 Clausthal-Zellerfeld, Germany
received October 1, 2012, received in revised form November 20, 2012, accepted January 19, 2013
Vol. 4, No. 1, Pages 41-48 DOI: 10.4416/JCST2012-00040a
Abstract
Transparent microspheres have been synthesized from K0.5Na0.5NbO3 using a CO2-5 kW laser beam. The influence of the laser power on the transparent fraction of the resulting microspheres has been investigated. Particle size (d50), chemical composition, microstructure, crystallization behavior and the optical transmission of the resulting microspheres have been characterized. The particle size of the resulting microspheres is 62.5 μm ± 1.4 μm. The highest transparent fraction is 68.5 % ± 1.6 %, achieved with the optimum laser power of 2 kW. The glass transition temperature (Tg) and the first temperature to induce crystallization (Tx) have been detected with a differential scanning calorimeter (DSC). They are 503 °C and 529 °C respectively. The transparent microspheres have been heat-treated at different temperatures in order to study the development of the microstructure. The correlation between the transparent fraction and the applied laser power has been discussed.
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Keywords
Keywords: Transparent K0.5Na0.5NbO3, laser fusing, kinetic window, crystallization, transmission behavior
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