TY - JOUR
T1 - Structural transformation of hexagonal (0001)BaTiO3 ceramics to tetragonal (111)BaTiO3 ceramics
AU - Watanabe, Takayuki
AU - Shimada, Mikio
AU - Aiba, Toshiaki
AU - Yabuta, Hisato
AU - Miura, Kaoru
AU - Oka, Kengo
AU - Azuma, Masaki
AU - Wada, Satoshi
AU - Kumada, Nobuhiro
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/9
Y1 - 2011/9
N2 - A ceramic slurry that contains a 6H-type Ba(Ti0.95Mn 0.05)O3 powder was casted into a plaster mold under 10 T magnetic field to form a green compact of (0001)-oriented Ba(Ti 0.95Mn0.05)O3. After sintering the green compact at 1300°C in air, it was confirmed that the (0001)-oriented 6Htype perovskite structure transformed to a (111)-oriented 3C-type perovskite structure. The structural transformation was again examined using hexagonal BaTiO3 prepared by reducing pseudo-cubic BaTiO3 powder in H2 atmosphere. In this case, the preferred (0001) orientation was not confirmed for the green compacts. After sintering the green compacts at 1300°C in air, mixed crystal orientations of (100)/(001) and (111) were observed for the resultant tetragonal BaTiO3 ceramics. This (100)/(001) orientation was suppressed by annealing the hexagonal BaTiO 3 powder at 1000°C before slip-casting, leading to highly (111)-oriented ceramics. It was found that the green compacts of (0001)-oriented hexagonal BaTiO3 can transform into (111)-oriented tetragonal BaTiO3 ceramics, maintaining the macroscopic crystal orientations due to a similar atomic stacking along [0001] of 6H-type BaTiO3 and [111] of 3C-type BaTiO3.
AB - A ceramic slurry that contains a 6H-type Ba(Ti0.95Mn 0.05)O3 powder was casted into a plaster mold under 10 T magnetic field to form a green compact of (0001)-oriented Ba(Ti 0.95Mn0.05)O3. After sintering the green compact at 1300°C in air, it was confirmed that the (0001)-oriented 6Htype perovskite structure transformed to a (111)-oriented 3C-type perovskite structure. The structural transformation was again examined using hexagonal BaTiO3 prepared by reducing pseudo-cubic BaTiO3 powder in H2 atmosphere. In this case, the preferred (0001) orientation was not confirmed for the green compacts. After sintering the green compacts at 1300°C in air, mixed crystal orientations of (100)/(001) and (111) were observed for the resultant tetragonal BaTiO3 ceramics. This (100)/(001) orientation was suppressed by annealing the hexagonal BaTiO 3 powder at 1000°C before slip-casting, leading to highly (111)-oriented ceramics. It was found that the green compacts of (0001)-oriented hexagonal BaTiO3 can transform into (111)-oriented tetragonal BaTiO3 ceramics, maintaining the macroscopic crystal orientations due to a similar atomic stacking along [0001] of 6H-type BaTiO3 and [111] of 3C-type BaTiO3.
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U2 - 10.1143/JJAP.50.09ND01
DO - 10.1143/JJAP.50.09ND01
M3 - Article
AN - SCOPUS:80053090953
SN - 0021-4922
VL - 50
JO - Japanese journal of applied physics
JF - Japanese journal of applied physics
IS - 9 PART 3
M1 - 09ND01
ER -