Doping behaviors of Nb2O5 and Co2O3 in temperature stable BaTiO3-based ceramics

Li, Wen; Qi, Jianquan; Wang, Yongli; Li, Longtu; Gui, Zhilun

doi:10.1016/s0167-577x(02)00687-0

Cited by 60 publications

(20 citation statements)

References 4 publications

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“…It has been found that ions with the valences smaller than 4 substituting the Ti sites exhibit acceptor character with charge deficiency compensated by doubly ionized oxygen vacancies [1,18]. Among the 3d elements Co is known to influence the elastic and the dielectric properties of the BaTiO 3 -based ceramics [2,19,20]. The addition of Co dopant up to 1 at.% results in an attenuation of mechanical losses and a smoothing of the elastic modulus anomaly [2].…”

Section: Introductionmentioning

confidence: 99%

Effect of cobalt doping on the dielectric response of Ba0.95Pb0.05TiO3 ceramics

et al. 2013

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Dielectric response of Ba 0.95 Pb 0.05 TiO 3 ceramics doped with 0.1 and 1 wt.% of Co 2 O 3 , synthesized by conventional high-temperature method, was studied in wide temperature and frequency range. The temperature dependences of the real and the imaginary parts of dielectric permittivity of the ceramics were compared with those of BaTiO 3 and Ba 0.95 Pb 0.05 TiO 3. The addition of Co 3+ ions results in a broadening of dielectric anomalies related to the transition to paraelectric cubic phase, and the structural transition between the tetragonal and the orthorhombic phases. At low temperatures (125-200 K) the dielectric absorption of Co-doped Ba 0.95 Pb 0.05 TiO 3 ceramics was found to exhibit relaxor-like properties. The dielectric response has been found to contain the contributions characteristic of fluctuations of the polar nanoregion boundaries and reorientations of the dipole moments between allowed directions in the nanoregions in the rhombohedral and the orthorhombic phases. The behavior speaks in favor of ordering of polar defects in the host lattice of Ba 0.95 Pb 0.05 TiO 3 in a form polar nanoregions .

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Section: Introductionmentioning

confidence: 99%

Effect of cobalt doping on the dielectric response of Ba0.95Pb0.05TiO3 ceramics

et al. 2013

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“…A research indicated [6] that, Ce 4+ ion(0.087 nm [7] ) substitutes for A-site(0.124 nm) in ABO 3 structure, the substitutional equation is: CeO 2 +2Ba x Ba →Cë Ba +2BaO+V″ Ba (1) C e 4 + i o n o c c u p i e s B a 2 + s i t e s a n d t w o positive charge appears because of the increase of electrovalency on A-site. It forms cationic vacancies, for the radius of Ce 4+ is much smaller than that of Ba 2+ .…”

Section: Resultsmentioning

confidence: 99%

Phase structure and dielectric properties of doped BaTiO3 ceramics

Wang

et al. 2007

J. Wuhan Univ. Technol.

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The effects of two rare earth oxides such as CeO 2 and Sm 2 O 3 on the phase structure and dielectric properties of BaTiO 3 ceramic were investigated. Results indicate that the dielectric constant of this system will increase greatly with the increasing content of these two oxides, and Ce 4+ substitutes for Ba 2+ located at A-site in ABO 3 structure. Quantitative XRD analysis shows that c/a ratio in the sample with addition of CeO 2 will increase, which implies the increase of tetragonality in system, causing the augment of dielectric constant, and the decrease of the crystal's geometrical symmetry results in curie-temperature moving towards low temperature; Sm 3+ (0.096 nm) substitutes for Ba 2+ (0.135 nm) possessing larger radius in A-site and the electrovalency in A-site increases, the mutual effect is strengthened, so the polarization is enhanced, and the dielectric constant increases notablely.

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“…They demonstrated that ceramics with core-shell [12,13] structure could be easily obtained by using these uniformly distributed powders. In addition, the BaTiO 3 -Nb 2 O 5 -Co 3 O 4 [14,15] and BaTiO 3 -Nb 2 O 5 -Ni 2 O 3 [16,17] composition has been explored for X9R MLCCs.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nb2O5 addition on the microstructure and dielectric properties of BaTiO3–Bi0.5Na0.5TiO3 ceramics

Zhang

Gao

Zhang

2015

J Mater Sci: Mater Electron

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The influence of Nb 2 O 5 on the microstructure and dielectric properties, including temperature dependence of permittivity, dielectric loss, and Curie temperature, has been investigated on BaTiO 3 -Bi 0.5 Na 0.5 TiO 3 (abbreviated as BBT) ceramics. Experiments reveal that incorporation of a proper content of Nb 2 O 5 in BBT ceramics can control the grain growth, reduce the dielectric loss, shift the Curie temperature to higher temperatures and significantly improve temperature characteristics of the BaTiO 3 -Bi 0.5 Na 0.5 TiO 3 ceramics. As a result, a novel X10R material is developed in the system, which is very promising for practical use in X10R multilayer ceramic capacitors. With the addition of 2.0 wt% Nb 2 O 5 , the ceramics sintered at 1,150°C showed favorable dielectric properties at 25°C (e r = 1,730, tand = 1.39 9 10 -2 , and TCC = 12.0 %).

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Doping behaviors of Nb2O5 and Co2O3 in temperature stable BaTiO3-based ceramics

Cited by 60 publications

References 4 publications

Effect of cobalt doping on the dielectric response of Ba0.95Pb0.05TiO3 ceramics

Effect of cobalt doping on the dielectric response of Ba0.95Pb0.05TiO3 ceramics

Phase structure and dielectric properties of doped BaTiO3 ceramics

Effects of Nb2O5 addition on the microstructure and dielectric properties of BaTiO3–Bi0.5Na0.5TiO3 ceramics

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