The role of Co in the BaTiO3-Na0.5Bi0.5TiO3 based X9R ceramics

Yue Sun; Hanxing Liu; Hua Hao; Lin Zhang; Shujun Zhang

doi:10.1016/j.ceramint.2014.08.140

The role of Co in the BaTiO₃-Na_0.5Bi_0.5TiO₃ based X9R ceramics

Yue Sun
, Hanxing Liu
, Hua Hao
, Lin Zhang
, Shujun Zhang

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

53 Citations (Scopus)

Abstract

Ceramics in BaTiO₃-Na_0.5Bi_0.5TiO₃-Nb₂O₅-Co₃O₄ (BT-NBT-Nb-Co) system were fabricated to satisfy the EIA-X9R specification (-55 ∼ 200 °C, ΔC/C ≤ ± 15%) of multilayer ceramic capacitors. The role of Co in this system was investigated. The core-shell structure was found to exist in the system, as confirmed by transmission electron microscopy (TEM), accounting for the high dielectric temperature stability. The Co can regulate the reaction between Nb and BT-NBT to adjust the core-shell structure, where the optimum dielectric properties were achieved at Nb/Co = 3, with dielectric constant being 930 at room temperature and capacitance variation being less than 15% in the temperature range from - 55 °C to 200 °C. The impedance spectroscopy was fitted by 3RC equivalent circuit, corresponding to the grain, grain boundary and ceramic/electrode interface region for the Co modified BT-NBT system. The conduction activation energy of grain was found to decrease with increasing Co concentration, where the conduction mechanism of grain and grain boundary are both sensitive to the Co concentration. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Original language	English
Pages (from-to)	931-939
Journal	Ceramics International
Volume	41
Issue number	1
DOIs	https://doi.org/10.1016/j.ceramint.2014.08.140
Publication status	Published - 2015
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

This work was supported by the Key program of National Natural Science Foundation of China (No. 50932004 ), International Science and Technology Cooperation Program of China ( 2011DFA52680 ), National Natural Science Foundation of China (Nos. 51372191 , and 51102189 ), the program for New Century Excellent Talents in University (No. NCET-11-0685 ), and the Fundamental Research Funds for the Central Universities ( WUT:2014-IV-134 ).

Research Keywords

C. Dielectric properties
C. Impedance
D. BaTiO3 and titanates
Multilayer ceramic capacitors

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title = "The role of Co in the BaTiO3-Na0.5Bi0.5TiO3 based X9R ceramics",

abstract = "Ceramics in BaTiO3-Na0.5Bi0.5TiO3-Nb2O5-Co3O4 (BT-NBT-Nb-Co) system were fabricated to satisfy the EIA-X9R specification (-55 ∼ 200 °C, ΔC/C ≤ ± 15\%) of multilayer ceramic capacitors. The role of Co in this system was investigated. The core-shell structure was found to exist in the system, as confirmed by transmission electron microscopy (TEM), accounting for the high dielectric temperature stability. The Co can regulate the reaction between Nb and BT-NBT to adjust the core-shell structure, where the optimum dielectric properties were achieved at Nb/Co = 3, with dielectric constant being 930 at room temperature and capacitance variation being less than 15\% in the temperature range from - 55 °C to 200 °C. The impedance spectroscopy was fitted by 3RC equivalent circuit, corresponding to the grain, grain boundary and ceramic/electrode interface region for the Co modified BT-NBT system. The conduction activation energy of grain was found to decrease with increasing Co concentration, where the conduction mechanism of grain and grain boundary are both sensitive to the Co concentration. {\textcopyright} 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",

keywords = "C. Dielectric properties, C. Impedance, D. BaTiO3 and titanates, Multilayer ceramic capacitors",

author = "Yue Sun and Hanxing Liu and Hua Hao and Lin Zhang and Shujun Zhang",

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T1 - The role of Co in the BaTiO3-Na0.5Bi0.5TiO3 based X9R ceramics

AU - Sun, Yue

AU - Liu, Hanxing

AU - Hao, Hua

AU - Zhang, Lin

AU - Zhang, Shujun

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2015

Y1 - 2015

N2 - Ceramics in BaTiO3-Na0.5Bi0.5TiO3-Nb2O5-Co3O4 (BT-NBT-Nb-Co) system were fabricated to satisfy the EIA-X9R specification (-55 ∼ 200 °C, ΔC/C ≤ ± 15%) of multilayer ceramic capacitors. The role of Co in this system was investigated. The core-shell structure was found to exist in the system, as confirmed by transmission electron microscopy (TEM), accounting for the high dielectric temperature stability. The Co can regulate the reaction between Nb and BT-NBT to adjust the core-shell structure, where the optimum dielectric properties were achieved at Nb/Co = 3, with dielectric constant being 930 at room temperature and capacitance variation being less than 15% in the temperature range from - 55 °C to 200 °C. The impedance spectroscopy was fitted by 3RC equivalent circuit, corresponding to the grain, grain boundary and ceramic/electrode interface region for the Co modified BT-NBT system. The conduction activation energy of grain was found to decrease with increasing Co concentration, where the conduction mechanism of grain and grain boundary are both sensitive to the Co concentration. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

AB - Ceramics in BaTiO3-Na0.5Bi0.5TiO3-Nb2O5-Co3O4 (BT-NBT-Nb-Co) system were fabricated to satisfy the EIA-X9R specification (-55 ∼ 200 °C, ΔC/C ≤ ± 15%) of multilayer ceramic capacitors. The role of Co in this system was investigated. The core-shell structure was found to exist in the system, as confirmed by transmission electron microscopy (TEM), accounting for the high dielectric temperature stability. The Co can regulate the reaction between Nb and BT-NBT to adjust the core-shell structure, where the optimum dielectric properties were achieved at Nb/Co = 3, with dielectric constant being 930 at room temperature and capacitance variation being less than 15% in the temperature range from - 55 °C to 200 °C. The impedance spectroscopy was fitted by 3RC equivalent circuit, corresponding to the grain, grain boundary and ceramic/electrode interface region for the Co modified BT-NBT system. The conduction activation energy of grain was found to decrease with increasing Co concentration, where the conduction mechanism of grain and grain boundary are both sensitive to the Co concentration. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

KW - C. Dielectric properties

KW - C. Impedance

KW - D. BaTiO3 and titanates

KW - Multilayer ceramic capacitors

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