Structure and magnetic properties of Mn-doped ZnO nanoparticles.

Authors :: Luo, J.
Liang, J. K.
Liu, Q. L.
Liu, F. S.
Zhang, Y.
Sun, B. J.
Rao, G. H.
Source :: Journal of Applied Physics; 4/15/2005, Vol. 97 Issue 8, p086106, 3p, 1 Black and White Photograph, 1 Chart, 3 Graphs
Publication Year :: 2005
Abstract: We report the crystal structure and magnetic properties of the Zn<subscript>1-x</subscript>Mn<subscript>x</subscript>O compounds synthesized by a combustion method. The Zn<subscript>1-x</subscript>Mn<subscript>x</subscript>O compounds with x=0–0.1 crystallize in the wurtzite ZnO structure. The lattice parameters a and c of Zn<subscript>1-x</subscript>Mn<subscript>x</subscript>O increase linearly with the Mn content, indicating that Mn<superscript>2+</superscript> ions substitute for Zn<superscript>2+</superscript> ions. Scanning electron microscopy shows that the average particle radius of Zn<subscript>0.95</subscript>Mn<subscript>0.05</subscript>O is about 40 nm. From the Curie–Weiss behavior of susceptibility at high temperature, it was found that the Mn–Mn interaction is dominated by antiferromagnetic coupling with effective nearest-neighbor exchange constant J about -32 K and the large negative value of the Curie–Weiss temperature. [ABSTRACT FROM AUTHOR]