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Tawfik Al-Naboulsi,Madona Boulos,Christophe Tenailleau,Pascal Dufour,Mirvat Zakhour,Sophie Guillemet-Fritsch 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.8
The current work aims to reduce the energy required to obtain a high quality barium titanate nanocrystals via solid-statereaction. In order to achieve this challenge, Ba(NO3)2 and TiO2 were mechanically activated by high-energy ball milling, andthen heat treated at moderate temperature (600 oC). When stoichiometric mixture was used, the formation of BT and minorBaCO3 and TiO2 impurities was observed. The use of Ba(NO3)2 excess leads to the formation of BT and a minor BaCO3impurity. A simple acid wash treatment was used to remove the carbonate impurity and to provide a high purity BT. Thepowders were characterized by XRD, BET, Raman spectroscopy, and SEM-FEG. Spark Plasma Sintering (SPS) technique wasused to get the dense nanoceramics. These materials show, at room temperature and at 1 kHz, colossal permittivity (ε = 105)associated with low dielectric loss (tg δ = 0.07).