Nucleation and growth of SrTiO{sub 3} on nanometer-sized BaTiO{sub 3} particles

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:468891

Chun, C M; Navrotsky, A; Aksay, I A ^[1]

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1. Princeton Univ., NJ (United States)

The hydrothermal processing of either BaTiO{sub 3} or SrTiO{sub 3} can result in the formation of nanometer-sized particles. Despite agreement on the mechanism of dissolution and precipitation, the remains some controversy concerning the nucleation and growth mechanism of the particles, particularly on the appearance of {open_quotes}raspberry-like{close_quotes} BaTiO{sub 3} particles in the early stage of growth. The controlled aggregation of primary particles by multiple clustering or morphological instability of continuous growth by molecular addition have been proposed as possible mechanisms. Similarly, the role of supersaturation during precipitation leading to the formation of colloidal BaTiO{sub 3} particles is not yet understood. Our TEM studies using the growth of SrTiO{sub 3} on BaTiO{sub 3} seed particle reveal that two different morphologies for the growing SrTiO{sub 3} exist and that the form taken by the SrTiO{sub 3} depends on the degree of supersaturation.

• OSTI ID: 468891
• Report Number(s): CONF-960877--; CNN: Grant AFOSR-F49620-93-1-0259
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CRYSTAL GROWTH
ELECTRON MICROSCOPY
NUCLEATION
STRONTIUM TITANATES