Improved room temperature dielectric properties of Gd3+ and Nb5+ co-doped Barium Titanate ceramics

Multilayer ceramic capacitors (MLCC) are important functional components of electronic information technology. The development of AC MLCC requires low dielectric loss and high AC breakdown voltage. In this paper, Y-Al-Ga-Si co-doped barium titanate ceramics were prepared by conventional solid state method. Microstructures, surface morphology and dielectric properties were investigated by X-ray diffraction, SEM, and LCR analyzer, respectively. Y3+ entered into the lattice of BaTiO3, replaced A-sites and B-sites, suppressed grain growth effectively, and made crystal structure change from tetragonal to pseudo-cubic, which reduced dielectric loss and lowered the Curie peak. The sintering characteristic and permittivity can be improved by the incorporation of Al and Ga. BaTiO3 -0.06Y2O3 - 0.02Ga2O3 -0.01Al2O3 -0.01SiO2 ceramics sintered at 1380°C achieved good dielectric properties: εr= ~2223, tanδ =~1.1% (at 1kHz), ΔC/C25 <~15.26% (from 55°C to 150°C).

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Aging behavior in Co doped barium titanate ceramics

2016 Joint IEEE International Symposium on the Applications of Ferroelectrics, European Conference on Application of Polar Dielectrics, and Piezoelectric Force Microscopy Workshop (ISAF/ECAPD/PFM) ◽

10.1109/isaf.2016.7578061 ◽

2016 ◽

Cited By ~ 1

Author(s):

Remy Ul ◽

Mai Pham-Thi ◽

Pascal Marchet

Keyword(s):

Barium Titanate ◽

Aging Behavior ◽

Doped Barium Titanate ◽

Titanate Ceramics ◽

Co Doped

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Microstructure and thermal properties of dysprosium and thulium co-doped barium titanate ceramics for high performance multilayer ceramic capacitors

Materials Science and Engineering B ◽

10.1016/j.mseb.2011.07.001 ◽

2011 ◽

Vol 176 (15) ◽

pp. 1227-1231 ◽

Cited By ~ 12

Author(s):

Jinseong Kim ◽

Dowan Kim ◽

Taimin Noh ◽

Byungmin Ahn ◽

Heesoo Lee

Keyword(s):

Thermal Properties ◽

Barium Titanate ◽

High Performance ◽

Multilayer Ceramic Capacitors ◽

Ceramic Capacitors ◽

Multilayer Ceramic ◽

Doped Barium Titanate ◽

Titanate Ceramics ◽

Co Doped

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Preparation and Dielectric Properties of the Nb and Co Doped Barium Titanate by Sol-Gel Auto-Ignition Synthesis Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.336-338.91 ◽

2007 ◽

Vol 336-338 ◽

pp. 91-94

Author(s):

Wen Feng Zhang ◽

Qing Zhi Yan ◽

Xin Tai Su ◽

Chang Chun Ge

Keyword(s):

Dielectric Properties ◽

Barium Titanate ◽

Ball Milling ◽

Sol Gel ◽

Xrd Analysis ◽

Synthesis Process ◽

Homogeneous Distribution ◽

Auto Ignition ◽

Doped Barium Titanate ◽

Co Doped

The Nb and Co doped barium titanate was synthesized by sol-gel auto-ignition synthesis process (abbreviated SAS) and compared with the doped powder of the same composition prepared by conventional ball milling process. The phase structure, morphology of the two as-obtained powders and correlative dielectric properties of sintered BaTiO3-based ceramics were measured. The XRD analysis demonstrated that the SAS powder was the Ba(M0.047Ti0.953)O3(M=Nb, Co) solid solution based on BaTiO3; it further suggested that Nb and Co cations could replace the Ti ions and reach reciprocal balance of acceptors and donors during the decomposition step of the organic fuel by igniting the dried gel. TEM observation showed that the Ba(M0.047Ti0.953)O3(M=Nb, Co) particles were spherical with the size ranged from 30 to 110nm. Furthermore, it was found that the value of the Curie temperature of both the doped powders was being lowered in comparison with pure BaTiO3 (Tc≈128°C ); and the dielectric constant at room temperature of the SAS powder was 5840, which was much higher than that of the conventional ball milling doped powder(3013). It was attributed to the maximum homogeneous distribution of dopants in Ba-Ti initial solution at atomic level via the SAS process.

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