TY - JOUR
T1 - Effects of oxygen annealing on dielectric properties of LuFeCuO4
AU - Matsuo, Yoji
AU - Suzuki, Muneyasu
AU - Noguchi, Yuji
AU - Yoshimura, Takeshi
AU - Fujimura, Norifumi
AU - Yoshii, Kenji
AU - Ikeda, Naoshi
AU - Mori, Shigeo
PY - 2008/11/14
Y1 - 2008/11/14
N2 - We investigated the effect of oxygen annealing on dielectric properties of LuFeCuO4 mainly by dielectric measurements and transmission electron microscopy experiments. It was found that the leakage current density decreases with high-pressure oxygen annealing and the size of nanodomains with orientational polarization increases, which is characterized by the short-range ordering of Fe3+ and Cu2+ ions on a triangular lattice. In addition, the absolute value of relative permittivity ε′ decreases with oxygen annealing and ε′ exhibits a broad peak in the temperature window between room temperature and 550K, which is similar to that observed in relaxor ferroelectric materials. The present experimental results suggest that the number of oxygen vacancies has a crucial effect on dielectric properties of LuFeCuO4.
AB - We investigated the effect of oxygen annealing on dielectric properties of LuFeCuO4 mainly by dielectric measurements and transmission electron microscopy experiments. It was found that the leakage current density decreases with high-pressure oxygen annealing and the size of nanodomains with orientational polarization increases, which is characterized by the short-range ordering of Fe3+ and Cu2+ ions on a triangular lattice. In addition, the absolute value of relative permittivity ε′ decreases with oxygen annealing and ε′ exhibits a broad peak in the temperature window between room temperature and 550K, which is similar to that observed in relaxor ferroelectric materials. The present experimental results suggest that the number of oxygen vacancies has a crucial effect on dielectric properties of LuFeCuO4.
KW - Dielectric material
KW - Oxygen annealing
KW - Transmission electron microscopy
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U2 - 10.1143/JJAP.47.8464
DO - 10.1143/JJAP.47.8464
M3 - Article
AN - SCOPUS:58749089489
VL - 47
SP - 8464
EP - 8467
JO - Japanese Journal of Applied Physics
JF - Japanese Journal of Applied Physics
SN - 0021-4922
IS - 11
ER -