TY - JOUR
T1 - Cubic Eu‐doped Hafnia Ultrafine Particles crystallized under hydrothermal conditions
AU - Sōmiya, Shigeyuki
AU - Yoshimura, Masahiro
AU - Toraya, Hideo
AU - Fushii, Yasuhito
PY - 1986
Y1 - 1986
N2 - The crystallization of HfO2–Eu2O3 amorphous co‐precipitates was Studied under hydrothermal conditions. The precipitates with the weight ratio of HfO2:Eu2O3 = 80:20 and 70:30 co‐precipitated by NH4OH from the solution HfOCl2 and EuCl3 and dried at 90°C for 100 h, yielded a single phase cubic solid solution Hf1‐xEuxO2‐x/2 (x = 0.230 and 0.339) with a fluorite lattice by hydrothermal treatment at 300°C under 10 MPa for 3 h. These products consist of non‐aggregated, ultrafine, narrow‐sized and single‐crystalline particles of about 10 nm and 8 nm in size for 20 wt% and 30 wt% Eu2O3 samples, respectively. It was confirmed by the TEM observation, X‐ray diffraction and specific surface area measurement by BET method which gave almost the same particle size. The maximum compositional fluctuation in the products was less than 2 wt% by energy dispersive spectroscopy for each particle and by precise X‐ray profile analysis of all the diffraction lines of the cubic phase using a Williamson‐Hall plotting (β cos Θ/λ vs sin Θ/λ).
AB - The crystallization of HfO2–Eu2O3 amorphous co‐precipitates was Studied under hydrothermal conditions. The precipitates with the weight ratio of HfO2:Eu2O3 = 80:20 and 70:30 co‐precipitated by NH4OH from the solution HfOCl2 and EuCl3 and dried at 90°C for 100 h, yielded a single phase cubic solid solution Hf1‐xEuxO2‐x/2 (x = 0.230 and 0.339) with a fluorite lattice by hydrothermal treatment at 300°C under 10 MPa for 3 h. These products consist of non‐aggregated, ultrafine, narrow‐sized and single‐crystalline particles of about 10 nm and 8 nm in size for 20 wt% and 30 wt% Eu2O3 samples, respectively. It was confirmed by the TEM observation, X‐ray diffraction and specific surface area measurement by BET method which gave almost the same particle size. The maximum compositional fluctuation in the products was less than 2 wt% by energy dispersive spectroscopy for each particle and by precise X‐ray profile analysis of all the diffraction lines of the cubic phase using a Williamson‐Hall plotting (β cos Θ/λ vs sin Θ/λ).
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U2 - 10.1002/zaac.19865400928
DO - 10.1002/zaac.19865400928
M3 - Article
AN - SCOPUS:84989039069
VL - 540
SP - 251
EP - 258
JO - Zeitschrift fur Anorganische und Allgemeine Chemie
JF - Zeitschrift fur Anorganische und Allgemeine Chemie
SN - 0044-2313
IS - 9-10
ER -