Details

Autor(en) / Beteiligte

• Zhang, Y J
• Yang, Y T
• Liu, Y
• Wang, Y X
• Yang, L L
• Wei, M B
• Fan, H G
• Zhai, H J
• Liu, X Y
• Liu, Y Q
• Yang, N N
• Wu, Y H
• Yang, J H

Titel

A novel approach to the synthesis of CoPt magnetic nanoparticles

Ist Teil von

• Journal of physics. D, Applied physics, 2011-07, Vol.44 (29), p.295003

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2011

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• L1 0 CoPt nanoparticles with face-centred tetragonal (FCT) structure are synthesized by the sol–gel method. Differential thermal analyses show the dehydration of various water molecules and decomposition/combustion of organic groups at a temperature below 600 °C and melting of Co and Pt at 700 °C. X-ray diffraction results show a transition from face-centred cubic to the FCT phase and an increase in particle size with increasing temperature. Transmission electron microscope (TEM) images show that highly monodisperse particles are obtained. High-resolution TEM (HRTEM) images reveal the appearance of L1 0 ordered phase at temperatures above 600 °C. The survey scans of x-ray photoelectron spectroscopy show that no magnetic impurity is detected within the detection limit. The maximum coercivity (353 344 A m −1 ) is obtained for the samples heated at 800 °C. The relationship between the temperature and the structure is discussed and the possible growth mechanism is given in terms of atomic diffusion.