Low temperature hydrothermal synthesis of nanophase BaTiO{sub 3}and BaFe{sub 12}O{sub 19} powders

Book · Mon Sep 01 04:00:00 EDT 1997

OSTI ID:522288

Dogan, F; O`Rourke, S; Qian, M X; Sarikaya, M ^[1]

---

1. Univ. of Washington, Seattle, WA (United States). Dept. of Materials Science and Engineering

Nanocrystalline powders with an average particle size of 50 nm has been synthesized two materials systems under hydrothermal conditions below 100 C. Processing variables, such as temperature, concentration and molar ratio of reactants and reaction time were optimized to obtain particles of reduced size and stoichiometric compositions. Hydrothermal reaction takes place between Ba(OH){sub 2} solution and titanium/iron precursors in sealed polyethylene bottles in the BaTiO{sub 3} and BaFe{sub 12}O{sub 19} systems, respectively. While crystalline BaTiO{sub 3} forms relatively fast within a few hours, formation of fully crystalline and stoichiometric BaFe{sub 12}O{sub 19} require considerably longer reaction times up to several weeks and strongly dependent on the Ba:Fe ratio of the precursors. The structural and compositional evaluation of the nanosphere powders are studied by XRD and TEM technologies.

• OSTI ID: 522288
• Report Number(s): CONF-961202--; ISBN 1-55899-361-4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AQUEOUS SOLUTIONS
BARIUM HYDROXIDES
BARIUM OXIDES
EXPERIMENTAL DATA
HYDROTHERMAL SYNTHESIS
IRON OXIDES
PARTICLE SIZE
REACTION KINETICS
TITANIUM OXIDES