TY - JOUR
T1 - Defects and microstructure of a hydrothermally derived (Bi 1/2 K 1/2 )TiO 3 powder
AU - Hagiwara, Manabu
AU - Ito, Makoto
AU - Fujihara, Shinobu
N1 - Funding Information:
The authors acknowledge the support by a Grant-in-Aid for Young Scientists (B) (No. 16K18241 ) from the Japan Society for the Promotion of Science (JSPS) .
Publisher Copyright:
© 2016 The Ceramic Society of Japan and the Korean Ceramic Society
PY - 2017/3/1
Y1 - 2017/3/1
N2 - Fine powders of bismuth potassium titanate (Bi 1/2 K 1/2 )TiO 3 (BKT) synthesized by hydrothermal reactions have been reported to have good sinterability and high chemical stability against long-time sintering. In this study, detailed chemical and structural characterizations were performed on a hydrothermal BKT powder sample to identify the origin of such properties. The results of X-ray diffraction, infrared transmittance, and diffuse reflectance measurements revealed that the hydrothermal BKT particle contained high concentrations of lattice hydroxyl group and Bi vacancy, whereas the observation by transmission electron microscope showed that its surface was covered with numerous Bi 2 O 3 nanoparticles to achieve the overall stoichiometric cation ratio of BKT. We found that the unique composite nanostructure of the hydrothermal BKT powder led to a large suppression of Bi evaporation during high-temperature sintering, thereby contributing to its superior chemical stability.
AB - Fine powders of bismuth potassium titanate (Bi 1/2 K 1/2 )TiO 3 (BKT) synthesized by hydrothermal reactions have been reported to have good sinterability and high chemical stability against long-time sintering. In this study, detailed chemical and structural characterizations were performed on a hydrothermal BKT powder sample to identify the origin of such properties. The results of X-ray diffraction, infrared transmittance, and diffuse reflectance measurements revealed that the hydrothermal BKT particle contained high concentrations of lattice hydroxyl group and Bi vacancy, whereas the observation by transmission electron microscope showed that its surface was covered with numerous Bi 2 O 3 nanoparticles to achieve the overall stoichiometric cation ratio of BKT. We found that the unique composite nanostructure of the hydrothermal BKT powder led to a large suppression of Bi evaporation during high-temperature sintering, thereby contributing to its superior chemical stability.
KW - Bismuth potassium titanate
KW - Defect chemistry
KW - Hydrothermal reaction
KW - Sintering
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U2 - 10.1016/j.jascer.2016.12.003
DO - 10.1016/j.jascer.2016.12.003
M3 - Article
AN - SCOPUS:85020062226
SN - 2187-0764
VL - 5
SP - 31
EP - 35
JO - Journal of Asian Ceramic Societies
JF - Journal of Asian Ceramic Societies
IS - 1
ER -