TY - JOUR
T1 - Structure property relationship in BaTiO3-Na0.5Bi0.5TiO3-Nb2O5-NiO X8R system
AU - Sun, Yue
AU - Liu, Hanxing
AU - Hao, Hua
AU - Song, Zhe
AU - Zhang, Shujun
N1 - Publisher Copyright:
© 2015 The American Ceramic Society.
PY - 2015/5/1
Y1 - 2015/5/1
N2 - A novel BaTiO3-Na0.5Bi0.5TiO3-Nb2O5-NiO (BT-NBT-Nb-Ni) system that meets the X8R specification (-55°C-150°C, ΔC/C≤±15%) of multilayer ceramic capacitors (MLCCs) was fabricated, with a maximum dielectric constant of 2350 at room temperature (25°C). Core-shell microstructure was observed by transmission electron microscopy (TEM), accounting for the good dielectric temperature stability. The role of Ni on the formation of core-shell structure and phase structure, and the subsequent relationship between structure and dielectric/ionic conduction properties were investigated. It was observed that the addition of Ni could adjust the ratio of core/shell, and significantly reduces the dielectric loss over the studied temperature range. A new Ba11(Ni, Ti)28O66+x phase with a 10-layer close-packed structure was identified by X-ray diffraction (XRD), serving as a source of oxygen vacancies for ionic conduction in addition to Ba(Ni,Ti)O3. Furthermore, the impedance spectroscopy measurements demonstrated the remarkable impact of these Ni-induced oxygen vacancies on both the grain and grain-boundary conductivities.
AB - A novel BaTiO3-Na0.5Bi0.5TiO3-Nb2O5-NiO (BT-NBT-Nb-Ni) system that meets the X8R specification (-55°C-150°C, ΔC/C≤±15%) of multilayer ceramic capacitors (MLCCs) was fabricated, with a maximum dielectric constant of 2350 at room temperature (25°C). Core-shell microstructure was observed by transmission electron microscopy (TEM), accounting for the good dielectric temperature stability. The role of Ni on the formation of core-shell structure and phase structure, and the subsequent relationship between structure and dielectric/ionic conduction properties were investigated. It was observed that the addition of Ni could adjust the ratio of core/shell, and significantly reduces the dielectric loss over the studied temperature range. A new Ba11(Ni, Ti)28O66+x phase with a 10-layer close-packed structure was identified by X-ray diffraction (XRD), serving as a source of oxygen vacancies for ionic conduction in addition to Ba(Ni,Ti)O3. Furthermore, the impedance spectroscopy measurements demonstrated the remarkable impact of these Ni-induced oxygen vacancies on both the grain and grain-boundary conductivities.
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U2 - 10.1111/jace.13517
DO - 10.1111/jace.13517
M3 - Article
AN - SCOPUS:85027932838
SN - 0002-7820
VL - 98
SP - 1574
EP - 1579
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 5
ER -