TY - JOUR
T1 - In-situ fabrication of ceramic/Metal nanocomposites by reduction reaction in barium titanate-Metal oxide systems
AU - Hwang, Hae Jin
AU - Toriyama, Motohiro
AU - Sekino, Tohru
AU - Niihara, Koichi
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1998/12
Y1 - 1998/12
N2 - Novel ceramic/metal nanocomposites were prepared by in-situ reduction method in BaTiO3/NiO, BaTiO3/WO3 and BaTiO3/MoO3 systems. The fabrication processes and the phase stability of these metal and metal oxides were studied using X-ray diffraction analysis and thermodynamic consideration. For BaTiO3/NiO system, NiO was entirely reduced at 500°C for several hours and dense BaTiO3/Ni nanocomposites were obtained without additional reaction phases. However, it was confirmed that a small amount of Ni2+ was dissolved in the BaTiO3 lattice. In the BaTiO3/WO3 system, in parallel with the reduction of WO3, BaTiO3 reacted with WO3 or WO2 to produce BaWO4. BaTiO3/W composite powder having no reaction products was difficult to fabricate by in-situ reduction process. On the other hand, BaTiO3/W composite could be obtained from BaTiO3 and W powder mixture when sintering below 1200°C. In contrast, the fabrication of BaTiO3/Mo composite was successfully achieved after reducing BaTiO3/MoO3 powder mixture at 800°C.
AB - Novel ceramic/metal nanocomposites were prepared by in-situ reduction method in BaTiO3/NiO, BaTiO3/WO3 and BaTiO3/MoO3 systems. The fabrication processes and the phase stability of these metal and metal oxides were studied using X-ray diffraction analysis and thermodynamic consideration. For BaTiO3/NiO system, NiO was entirely reduced at 500°C for several hours and dense BaTiO3/Ni nanocomposites were obtained without additional reaction phases. However, it was confirmed that a small amount of Ni2+ was dissolved in the BaTiO3 lattice. In the BaTiO3/WO3 system, in parallel with the reduction of WO3, BaTiO3 reacted with WO3 or WO2 to produce BaWO4. BaTiO3/W composite powder having no reaction products was difficult to fabricate by in-situ reduction process. On the other hand, BaTiO3/W composite could be obtained from BaTiO3 and W powder mixture when sintering below 1200°C. In contrast, the fabrication of BaTiO3/Mo composite was successfully achieved after reducing BaTiO3/MoO3 powder mixture at 800°C.
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U2 - 10.1016/S0955-2219(98)00154-X
DO - 10.1016/S0955-2219(98)00154-X
M3 - Article
AN - SCOPUS:0032301530
VL - 18
SP - 2193
EP - 2199
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 14
ER -