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Location of Cu2+ ions in some protoned Nasicon-type phosphates

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Abstract

Nasicon-type phosphates Cu1−xHxZr2(PO4)3 (0 < x <1) and Cu1−xH2x−1Zr2(PO4)3 (0.5 < x <1) have been investigated by magnetic susceptibility and electron paramagnetic resonance (EPR). Room-temperature EPR spectra at X-band (9.5 GHz) exhibit relatively different local information about paramagnetic environments in the two sets. Analysis by computer simulations of Cu1−xHxZr2(PO4)3 spectra reveals that Cu2+ ion is located in an axially distorted octahedron, which can be assigned to the M(1) site. However, in the case of Cu1−xH2x−1Zr2(PO4)3, EPR parameters suggest that Cu2+ ions are distributed in two types of sites with axial and lower than axial symmetries; these latter can be attributed to M(1) and M(2) sites respectively. g and A components are related to structural properties using molecular orbital method. Data are obtained on variations of the bond covalence with the composition.

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Authors and Affiliations

  1. Laboratoire de Spectronomie Physique, Faculté des Sciences, BP 4010 Béni M'hamed, Meknès, Morocco

    I. Taoufik & M. Haddad

  2. Laboratoire de Chimie du Solide et Inorganique Moléculaire, URA CNRS 1495, Groupe de Cristallochimie, Université de Rennes, Avenue du Général Leclerc, 35042, Rennes Cedex, France

    R. Brochu

  3. UMR Université Bordeaux-I, CNRS 5798, 351 cours de la Libération, 33405, Talence Cedex, France

    R. Berger

Authors
  1. I. Taoufik
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  2. M. Haddad
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  3. R. Brochu
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  4. R. Berger
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Correspondence to M. Haddad.

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Taoufik, I., Haddad, M., Brochu, R. et al. Location of Cu2+ ions in some protoned Nasicon-type phosphates. Journal of Materials Science 34, 2943–2947 (1999). https://doi.org/10.1023/A:1004656023198

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