caa a22 4500 463228367 CHVBK 20180405153234.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s10853-007-1537-6 doi (NATIONALLICENCE)springer-10.1007/s10853-007-1537-6 Solid-state synthesis of nano-sized BaTiO3 powder with high tetragonality [Elektronische Daten] [Sung-Soo Ryu, Dang-Hyok Yoon] A solid-state reaction method was used to synthesize nano-sized, Ca-doped BaTiO3 powder with high tetragonality (=c/a) in order to increase the volumetric efficiency of multilayer ceramic capacitors (MLCCs). The reaction temperatures for three different starting material combinations were examined by thermogravimetric/differential thermal analysis (TG/DTA). Nano-sized starting materials and the mechanochemical activation of the needle-shaped BaCO3 via high-energy milling were effective in decreasing the reaction temperature. In addition, the results showed that the tetragonality of fine Ca-doped BaTiO3 could be enhanced by 2-step heat treatment, consisting of holding at 800°C for 1h followed by consecutive heating to the target temperature, without any significant grain growth than that of the conventional 1-step calcination. The synthesized particles heat-treated at 950 and 1,000°C by 2-step heat treatment were confirmed by characterization to have an average size of 128 and 212nm, and a tetragonality of 1.0097 and 1.0105, respectively, which are higher tetragonality values than those previously reported for similar sized particles. Springer Science+Business Media, LLC, 2007 Ryu Sung-Soo Korea Institute of Ceramic Engineering and Technology, 153-801, Seoul, Korea aut Yoon Dang-Hyok School of Materials Science and Engineering, Yeungnam University, Dae-dong, 712-749, Gyeongsan, Gyeongbuk, Korea aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/17(2007-09-01), 7093-7099 0022-2461 42:17<7093 2007 42 10853 https://doi.org/10.1007/s10853-007-1537-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1537-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ryu Sung-Soo Korea Institute of Ceramic Engineering and Technology, 153-801, Seoul, Korea aut NATIONALLICENCE 700 1- Yoon Dang-Hyok School of Materials Science and Engineering, Yeungnam University, Dae-dong, 712-749, Gyeongsan, Gyeongbuk, Korea aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/17(2007-09-01), 7093-7099 0022-2461 42:17<7093 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer