Metamagnetic DyAlO3 nanoparticles with very low magnetic moment
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Nanocrystalline dysprosium monoaluminate (DyAlO3) has been synthesized by modified sol–gel method after sintering the precursor gel at 950 °C. The micro-structural features have been verified by X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy. The XRD pattern confirms the formation of single-phase DyAlO3; the average size of the nanoparticles is 50 nm. X-Ray photoelectron spectroscopy has been used to study the chemical composition and bonding in the samples. The binding energies of core-level electrons in Dy, Al and O in DyAlO3 nanopowder have been found slightly shifted compared to the respective values of the same elements. Both AC and DC magnetic susceptibilities have been measured in the temperature range 2–300 K. Unusually low effective magnetic moment of Dy3+, μeff = 0.38, has been derived from the inverse magnetic susceptibility–temperature plot between 4 and 252 K. The Nèel temperature, TN = 3.920 K and exchange interaction constant J/k = −1.74 K, have been also determined.
KeywordsDysprosium monoaluminate Malic acid Nanocrystals Sol–gel method Magnetic properties
The authors would like to thank the University of Food Technologies-Plovdiv for the financial support.
- 1.Mizuno M, Yamada T, Noguchi T (1977) J Ceram Soc Jpn 85:90–95Google Scholar
- 2.Vasylechko L, Senyshyn A, Bismayer U (2009) In: Gschneidner Jr KA, Bünzli J–CG, Pecharsky VK (eds) Handbook on the physics and chemistry of rare earths, vol 39. Elsevier, Amsterdam, pp 113–295Google Scholar
- 3.Holmes LM, Van Uitert LG, Hecker RR, Hull GW (1972) Phys Rev B5:138–146Google Scholar
- 7.Bidaux A, Meriel P (1968) J Phys 29:220–224Google Scholar
- 11.Ghosh T, Chhaparwal S (2007) In: Goddard WA III, Brenner DW, Lyshevski SE, Iafrate GJ (eds) Handbook of nanoscience, engineering, and technology. CRC Press, Boca Raton, pp 21–45Google Scholar
- 13.Pechini MP (1967) US Pat. 3,330,697, 6 ppGoogle Scholar
- 18.Williams GP (2004) In: Lide D (ed) CRC handbook of chemistry and physics, 85th edn. CRC Press, Boca Raton, pp 10–208, 209, 211Google Scholar
- 20.Casey AT, Mitra S (1976) In: Boudreaux EA, Mulay LN (eds) Theory and applications of molecular paramagnetism. Wiley-Interscience, New York, pp 278–316Google Scholar