期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 322, 期 5, 页码 536-541出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2009.10.011
关键词
Doping; X-ray diffraction; Transmission electron microscopy (TEM); Magnetization measurement
资金
- UoP-BARC
Present study reports the detailed structural and magnetic, as well as chemical analysis of polycrystalline Zn1-xMnxO (where x=0, 0.005, 0.01, 0.03, 0.05 and 0.1) samples synthesized by the high-temperature solid state reaction route. X-ray diffraction studies reveal the presence of secondary phase for higher Mn-doping concentrations (x >= 0.03). Secondary phase formation having spinel structure is confirmed and reported as an evidence for the first time using transmission electron microscopy study. Chemical investigations using X-ray photoelectron spectroscopy showed the presence of Mn in two valence states. From the observed results we are of the opinion that Zn2+ ions, mainly present at or near grain boundaries, diffuse into manganese oxide to form a stable spinel phase ZnxMn3-xO4 at or near the grain boundaries of ZnO/Zn1-xMnxO. Magnetization measurements did not show any magnetic transition down to 5 K. (C) 2009 Elsevier B.V. All rights reserved.
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