Jpn. J. Appl. Phys. 41 (2002) pp. 5654-5658 |Next Article| |Table of Contents|
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Characteristics of Nanoparticles Formed during Pulsed Laser Ablation of SrBi2Ta2O9
1RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
2Department of Electrical, Electronic, and Computer Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan
(Received February 7, 2002; accepted for publication May 23, 2002)
Particle formation was investigated during laser ablation of strontium bismuth tantalate (SBT) with a background of pure oxygen (O2). For an O2 pressure, PO2, varying from 210 to 1300 Pa, the mean particle size ranged from 9 to 22 nm, and the particle concentration ranged from about 1012 to 108 cm-3. For PO2=210 Pa, the particle size ranged from 5 to 30 nm, and for PO2=1300 Pa, the particle size ranged from 10 to 80 nm. Transmission electron microscopy measurement of particles size-classified at 10 and 20 nm showed that some particles were spherical and others were irregularly shaped. Electron diffraction of the particles showed that the spherical particles were partially crystallized whereas the irregularly shaped particles were amorphous. The formation of these two different morphologies is attributed to different particle cooling rates stemming from spatially nonuniform gas temperatures induced by laser ablation. Regardless of their shape, the particles were composed of strontium, bismuth, tantalum, and oxygen.
KEYWORDS:nanoparticles, laser ablation, SrBi2Ta2O9, size distribution, structure, morphology
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