NDLI: The physical and photo electrochemical characterization of the crednerite CuMnO$

Content Provider	Springer Nature Link
Author	Bessekhouad, Yassine Gabes, Yamina Bouguelia, Aissa Trari, Mohamed
Copyright Year	2007
Abstract	CuMnO$_{2}$ is prepared via Cu$^{+}$ → Li$^{+}$ exchange in molten copper (I) chloride. It crystallizes in a monoclinic structure (SG C2/m) where the MnO$_{6}$ octahedra elongation is ascribed to the Yahn–Teller (Y–T) effect of Mn$^{3+}$ ions. From chemical analysis, the oxide is more accurately formulated as CuMnO$_{2.01}$. Above 250 °C, it undergoes a reversible transition to spinel Cu$_{ x }$Mn$_{3−x }$O$_{4}$ and beyond 940 °C it converts back to Cu$_{1.1}$Mn$_{0.9}$O$_{2}$. Extrapolation of high-temperature magnetic data indicates T-intercept θ $_{p}$ of −450 K and an effective moment of 5.22 μ$_{B}$, consistent with strong antiferromagnetism in the basal plans and high spin (HS) configuration Mn$^{3+}$. This value is slightly larger than that of the spin only moment, a behavior ascribed to Cu$^{2+}$ originating from oxygen insertion. As prepared, CuMnO$_{2}$ displays p-type conductivity with an activation energy of 0.16 eV. Most holes generated upon band gap excitation are trapped on Cu$^{+}$ ions and the conduction occurs by small polarons hopping between neighboring sites. The linear increase of thermopower for Cu$_{1.05}$Mn$_{0.95}$O$_{2}$ with temperature indicates a hole mobility μ$_{300 K}$ (3.5 × 10$^{-6}$ cm$^{2}$ V$^{−1 }$s$^{−1}$) thermally activated. CuMnO$_{2}$ is made p- and n-type and the difference in the carriers mobilities is attributed to different oxygen polyhedra. The title oxide, characterized photo electrochemically, exhibits a pH-insensitive flat band potential (+0.13 V$_{SCE}$). The valence band, located at 5.3 eV below vacuum, is made up of Cu 3d orbital. As application, the powder showed a good performance for the H$_{2}$-photo evolution.
Starting Page	6469
Ending Page	6476
Page Count	8
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	42
Issue Number	15
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2007-04-25
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mechanics Crystallography Continuum Mechanics and Mechanics of Materials Polymer Sciences Characterization and Evaluation of Materials Materials Science
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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