Mössbauer study of SnO2 powders doped with dilute 57Fe prepared by a sol-gel method

Autor:	Kiyoshi Nomura, J. Sakuma, Masuo Takeda, C. Barrero
Rok vydání:	2006
Předmět:	Materials science Scanning electron microscope Annealing (metallurgy) Analytical chemistry General Physics and Astronomy chemistry.chemical_element Magnetization Paramagnetism Nuclear magnetic resonance chemistry Rutile Mössbauer spectroscopy Tin Sol-gel
Zdroj:	Czechoslovak Journal of Physics. 56:E75-E81
ISSN:	1572-9486 0011-4626
DOI:	10.1007/s10582-006-0473-z
Popis:	SnO2 powders, doped with various 57Fe contents were prepared by a sol-gel method, and annealed finally at 500 °C and 650 °C. These samples were characterized by Mossbauer spectroscopy, vibrating sample magnetometer (VSM), scanning electron microscopy (SEM), and X-ray diffraction (XRD) to investigate the relationship of magnetic properties, grain sizes, annealing temperatures and Mossbauer parameters. The particle sizes of SnO2 powders reduced to less than 100 nm with the increase of Fe contents up to 5%. Rutile SnO2 was the only phase obtained for all samples. Room temperature Mossbauer spectra suggest the presence of two different paramagnetic iron sites for all samples and one magnetically relaxed species for those samples with the lowest iron concentrations. The magnetization increased with the Fe content, but was reduced for the samples annealed at 650 °C perhaps due to a segregation of α-Fe2O3 doped with tin.
Databáze:	OpenAIRE
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