Inversion and suppression of an oxygen bulk phase transition in confined geometry
Universität des Saarlandes, Technische Physik, 66123 Saarbrücken, Germany
2 Institut Laue-Langevin, BP 156, 38042 Grenoble, Cedex 9, France
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Published online: 5 November 2003
By means of susceptibility experiments on oxygen confined to the pores of a Gelsil substrate we investigated the bulk γ-β transition. At low fillings, the transformation is completely suppressed. At higher but still incomplete filling we observe a partial transformation from γ to β on cooling and a subsequent inverted transition on heating, i.e. the transformation of γ-phase material into the β-phase upon heating. At 100% filling this inversion disappears. We discuss our results on the basis of geometric considerations.
PACS: codes. – 75.75.+a - magnetic properties of nanostructures / codes. – 61.43.Gt - powders, porous materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003