Highly aluminium doped barium and strontium ferrite nanoparticles prepared by citrate auto-combustion synthesis

Journal Article · Thu Feb 15 04:00:00 EST 2007 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2006.06.001· OSTI ID:21000589

Shirtcliffe, Neil J ^[1]; Thompson, Simon ^[1]; O'Keefe, Eoin S ^[2]; Appleton, Steve ^[2]; Perry, Carole C ^[1]

---

1. Nottingham Trent University, Clifton Lane, Clifton, Nottingham NG11 8NS (United Kingdom)
2. QinetiQ, Farnborough, Hampshire (United Kingdom)

Aluminium doped barium and strontium hexaferrite nanoparticles BaAl {sub x}Fe{sub (12-x)}O{sub 19} and SrAl {sub x}Fe{sub (12-x)}O{sub 19} were synthesised via a sol-gel route using citric acid to complex the ions followed by an auto-combustion reaction. This method shows promise for the synthesis of complex ferrite powders with small particle size. It was found that around half of the iron could be substituted for aluminium in the barium ferrite with structure retention, whereas strontium aluminium ferrites could be produced with any aluminium content including total substitution of the iron. All synthesised materials consisted of particles smaller than 1 {mu}m, which is the size of a single magnetic domain, and various doping levels were achieved with the final elemental composition being within the bounds of experimental error. The materials show structural and morphological changes as they move from iron to aluminium ferrites. Such materials may be promising for imaging applications.

• OSTI ID: 21000589
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 42; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
BARIUM
BARIUM COMPOUNDS
CHEMICAL PREPARATION
CITRATES
CITRIC ACID
COMBUSTION
DOPED MATERIALS
FERRITE
FERRITES
IRON
MORPHOLOGICAL CHANGES
NANOSTRUCTURES
OXIDES
PARTICLE SIZE
SOL-GEL PROCESS
STRONTIUM