Hydrothermal synthesis and dielectric properties of tetragonal BaTiO{sub 3}

Journal Article · Thu Sep 01 04:00:00 EDT 1994 · Chemistry of Materials

DOI:https://doi.org/10.1021/cm00045a011· OSTI ID:160349

Dutta, P K; Asiaie, R; Akbar, S A ^[1]

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1. Ohio State Univ., Columbus, OH (United States); and others

Hydrothermal synthesis of barium titanate (BaTiO{sub 3}) at 240{degrees}C using different barium salts as starting reactants is examined. It is found that halide salts (I{sup {minus}}, Br{sup {minus}}, Cl{sup {minus}}) result in the highest tetragonal content, followed by acetate, nitrate, and hydroxide salts. The tetragonal content was quantified from differential scanning calorimetry by following the endothermic Curie transition around 130{degrees}C and reached as high as 37-39% for the materials made with the barium halides. The particle sizes ranged from 0.15 to 0.37 {mu}m, as estimated by scanning electron microscopy. Sintering and dielectric properties of the barium titanates synthesized from different barium sources were examined. BaTiO{sub 3} made from the chloride salt sintered with high densities at 1250{degrees}C with grain sizes of 1-5 {mu}m and a room-temperature dielectric constant (1 kHz) of 2960. 35 refs., 10 figs., 1 tab.

• Sponsoring Organization: USDOE
• OSTI ID: 160349
• Journal Information: Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 9 Vol. 6; ISSN CMATEX; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CHEMICAL PREPARATION
DIELECTRIC PROPERTIES
HYDROTHERMAL SYNTHESIS
TETRAGONAL LATTICES
TITANATES