Investigation of the sintering of barium titanate ceramics by oxygen coulometry

Using titanium nitrate solution stabilized by chelation, amorphous fine particles of the Ba-Ti-O system were prepared by the mist decomposition method in air. After calcination of these particles, barium titanate ceramics were prepared using the hot uniaxial pressing method, and various properties were investigated. As a result, the grain sizes could be controlled over the range from 58 nm to 187 nm by the sintering temperatures and/or the calcination temperatures, keeping the density almost constant. Moreover, the dielectric properties of the samples showed that the relative permittivity decreased with decreasing grain size, and Curie temperature also shifted to lower temperatures in the same way. In this study, we first found that Curie temperature existed in the barium titanate ceramics with grain sizes from 58 to 147 nm.

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Water-Induced Degradation of Barium Titanate Ceramics Studied by Electrochemical Hydrogen Charging

Journal of the American Ceramic Society ◽

10.1111/j.1151-2916.2003.tb03366.x ◽

2003 ◽

Vol 86 (4) ◽

pp. 735-37 ◽

Cited By ~ 15

Author(s):

Wan Ping Chen ◽

Xiang Ping Jiang ◽

Yu Wang ◽

Zhi Peng ◽

Helen Lai Wah Chan

Keyword(s):

Barium Titanate ◽

Hydrogen Charging ◽

Titanate Ceramics

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Preparation of [110] Grain Oriented Barium Titanate Ceramics by Templated Grain Growth Method and Their Piezoelectric Properties

2007 International Symposium on Micro-NanoMechatronics and Human Science ◽

10.1109/mhs.2007.4420883 ◽

2007 ◽

Author(s):

Satoshi Wada ◽

Kotaro Takeda ◽

Takaaki Tsurumi ◽

Toshio Kimura

Keyword(s):

Barium Titanate ◽

Grain Growth ◽

Piezoelectric Properties ◽

Templated Grain Growth ◽

Growth Method ◽

Titanate Ceramics

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Grain-Size Effects on Diffuse Phase Transitions of Batio3 Ceramics Obtained by Alkoxide Precursors

MRS Proceedings ◽

10.1557/proc-346-309 ◽

1994 ◽

Vol 346 ◽

Author(s):

R. P. S. M. Lobo ◽

R. L. Moreira ◽

N. D. S. Mohallem

Keyword(s):

Grain Size ◽

Phase Transitions ◽

Barium Titanate ◽

Size Effects ◽

Sol Gel ◽

Simple Relationship ◽

Titanate Ceramics ◽

Charged Defects ◽

Alkoxide Precursors ◽

Diffuse Phase

ABSTRACTBarium titanate ceramics have been obtained by sol-gel methods. The dielectric investigations of these materials revealed the existence of diffuse ferroelectric transitions. By using a phenomenological model, we could demonstrate the existence of a simple relationship between the diffuse character of the transition and the sample grain-size. This effect has been attributed to interactions between charged defects on the grain surfaces and the spontaneous polarization of the material.

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