Microstructural aspects of nanocrystalline LiZn ferrites densified with chemically derived additives

Book · Thu Dec 31 04:00:00 EST 1998

OSTI ID:323392

Cho, Y S; Burdick, V L; Amarakoon, V R.W. ^[1]; Underhill, E; Brissette, L ^[2]

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1. Alfred Univ., NY (United States). New York State Coll. of Ceramics
2. Electromagnetic Science Technologies Inc., Norcross, GA (United States)

Densification behavior and microstructural characteristics of nanocrystalline LiZn ferrites with chemically derived additives were investigated. Nanocrystalline Li{sub 0.3}Zn{sub 0.4}Fe{sub 2.3}O{sub 4} powders having a {approx} 15 nm size were prepared at a low temperature of 450 C by a chemical synthesis using a combustible polyacrylic acid (PAA). Small amounts of Si, Ca and Mn were incorporated into the nanocrystalline ferrites via sol-gel reactions utilizing tetraethyl orthosilicate, calcium isopropoxide and manganese acetate. This process was believed to give a homogeneous distribution of the additives over the nanocrystalline ferrites. A uniform microstructure was obtained without any evidence of exaggerated grain growth after sintering at 1,100 C. Saturation magnetization and coercive force were found to increase with the chemical additives. The results were compared with those of the same composition, but processed by the conventional batch-mixing of corresponding oxide additives.

• OSTI ID: 323392
• Report Number(s): CONF-971201--; ISBN 1-55899-399-1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DOPED MATERIALS
EXPERIMENTAL DATA
IRON OXIDES
LITHIUM OXIDES
MAGNETIC PROPERTIES
MICROSTRUCTURE
SHRINKAGE
SINTERING
ZINC OXIDES