TY - JOUR
T1 - Internal distortion in ceria-doped hafnia solid solutions
T2 - High-resolution x-ray diffraction and Raman scattering
AU - Fujimori, Hirotaka
AU - Yashima, Masatomo
AU - Sasaki, Satoshi
AU - Kakihana, Masato
AU - Mori, Takeharu
AU - Tanaka, Masahiko
AU - Yoshimura, Masahiro
PY - 2001
Y1 - 2001
N2 - High-resolution synchrotron x-ray powder diffraction and Raman scattering have indicated the existence of tetragonal ceria-doped hafnia with both an axial ratio (formula presented) of unity and internal shear defomation. The values of (formula presented) ratio in (formula presented) samples (formula presented) 85, and 90) are estimated to be (formula presented) from the estimated standard deviation of the peak positions and to be (formula presented) from the full width at half maximum of the (formula presented) reflection peaks. However, the Raman spectra of these samples clearly demonstrate the tetragonal phase. The intensity of the Raman band around 280 (formula presented), which is one of the characteristic bands of the tetragonal phase, continuously decreased and approached zero between X=90 and 95, which reflects the tetragonal-cubic phase boundary is located within this compositional range. The lattice distortion does not induce the cubic-tetragonal phase transition but an internal distortion in oxygen sublattice, oxygen displacement along the (formula presented) axis from the ideal fluorite position, does.
AB - High-resolution synchrotron x-ray powder diffraction and Raman scattering have indicated the existence of tetragonal ceria-doped hafnia with both an axial ratio (formula presented) of unity and internal shear defomation. The values of (formula presented) ratio in (formula presented) samples (formula presented) 85, and 90) are estimated to be (formula presented) from the estimated standard deviation of the peak positions and to be (formula presented) from the full width at half maximum of the (formula presented) reflection peaks. However, the Raman spectra of these samples clearly demonstrate the tetragonal phase. The intensity of the Raman band around 280 (formula presented), which is one of the characteristic bands of the tetragonal phase, continuously decreased and approached zero between X=90 and 95, which reflects the tetragonal-cubic phase boundary is located within this compositional range. The lattice distortion does not induce the cubic-tetragonal phase transition but an internal distortion in oxygen sublattice, oxygen displacement along the (formula presented) axis from the ideal fluorite position, does.
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U2 - 10.1103/PhysRevB.64.134104
DO - 10.1103/PhysRevB.64.134104
M3 - Article
AN - SCOPUS:0035494286
VL - 64
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 13
ER -