Influence of Mn substitution on microstructure and magnetic properties of Cu1-x Mnx O nanoparticles
Journal
Journal of Applied Physics
Journal Volume
101
Journal Issue
9
Date Issued
2007
Author(s)
Abstract
Mn-doped CuO nanoparticles were synthesized using a coprecipitation method. Powder x-ray analysis reveals that all the samples crystallize into a monoclinic-type structure. Significant changes occur in both the microstructure and particle size with calcination temperature TA. The average particle size d increases from 11to85nm as the TA increases from 250to850°C. For particles of size d⩽22nm, energy dispersive spectroscopy indicates the existence of a crystalline Cu1−xMnxO core surrounded by an amorphous CuO shell. M(T) curves reveal a spin-glass behavior for the 11 and 22nm particles and a ferromagnetic behavior for particles of size d⩾35nm. The observed ferromagnetic behavior is attributed to the coexistence of Mn2+ and Mn3+ ions.
Type
journal article