caa a22 4500 388022191 CHVBK 20180307124927.0 cr unu---uuuuu 161130e199808 xx s 000 0 eng 10.1017/S0884291400045520 doi S0884291400045520 pii (NATIONALLICENCE)cambridge-10.1017/S0884291400045520 Synthesis processes and sintering behavior of layered-perovskite barium bismuth tantalate ceramics [Elektronische Daten] Ferroelectric layered-perovskite BaBi2Ta2O9 has been successfully prepared through a novel process using BiTaO4 as a precursor. Heating the mixtures of BiTaO4 and BaCO3 at 900 °C without soaking results in the complete formation of the monophasic powder. In contrast, the conventional solid-state reaction requires soaking at 900 °C for 2 h to obtain the pure compound. Such prolonged heat treatment causes unfavorable growth of particles. In the new process, the formation of BaBi2Ta2O9 is markedly accelerated due to the suppression of the formation of a stable intermediate Ba5Ta4O15. In addition, this process yields submicron BaBi2Ta2O9 powder with significantly improved sinterability. Sintering at 1000 °C affords well-densified ceramics. On the other hand, heating at temperatures greater than 1100 °C causes BaBi2Ta2O9 to thermally decompose and form Bi2O3 and rod-like BaTa2O6. The formation of these rod-like grains results in the expansion of the matrix, thereby reducing the density. Copyright © Materials Research Society 1998 Lu Chung-Hsin Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China Fang Buh-Kuan Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China Journal of Materials Research Cambridge University Press 13/8(1998-08), 2262-2268 0884-2914 13:8<2262 1998 13 JMR https://doi.org/10.1017/S0884291400045520 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0884291400045520 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lu Chung-Hsin Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China NATIONALLICENCE 700 1- Fang Buh-Kuan Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/8(1998-08), 2262-2268 0884-2914 13:8<2262 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge