Structural, chemical and magnetic investigations of polycrystalline Zn1−xMnxO |
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Authors: | Alka V. Deshmukh S.M. Yusuf N.P. Lalla |
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Affiliation: | a Centre for Advanced Studies in Materials Science and Condensed Matter Physics, Department of Physics, University of Pune, Pune 411 007, India b Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India c UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India |
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Abstract: | 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. |
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Keywords: | 61.72.uj 61.05. cp 61.50.&minus f 68.37.Lp 07.55.Jg |
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