Tetrahedral versus octahedral Mn site coordination in wurtzite and rocksalt Zn1−xMnxO investigated by means of XAS experiments under high pressure |
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| Authors: | J Pellicer-Porres A Segura JF Snchez-Royo JA Sans JP Iti AM Flank P Lagarde A Polian |
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| Institution: | aICMUV, Universidad de Valencia, c/Dr. Moliner 50, 46100 Burjassot, Valencia, Spain;bSynchrotron SOLEIL, L’ Orme des Merisiers, Saint-Aubin - BP 48 91192, Gif-sur-Yvette CEDEX, France;cPhysique des Milieux Denses, IMPMC, Université Pierre et Marie Curie, 140 Boulevard de Lourmel, 75015 Paris, France |
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| Abstract: | We present the results of x-ray absorption measurements carried out in Zn1−xMnxO thin films under high pressure. The Mn environment remains essentially the same for nominal Mn concentrations given by x=0.05, 0.1, 0.15 and 0.25. Both the XANES (X-ray Absorption Near Edge Structure) and EXAFS (Extended X-ray Absorption Fine Structure) indicate that Mn occupies the Zn site, being surrounded by four oxygen atoms at 2.02±0.01 Å. The substitutional hypothesis is reinforced by comparing the differences between the ambient (wurtzite) and high pressure (rocksalt) spectra, which correspond to tetrahedral and octahedral Mn environments. |
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| Keywords: | ZnO XAS High pressure XANES EXAFS XAFS |
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