Ionic conductivity and structural characterization of Na1.5Nb0.3Zr1.5(PO4)3 with NASICON-type structure
| Autor: | Juan E. Iglesias, Paloma Calle, J. M. Rojo, Ana Martínez-Juárez, Carla Verissimo, Oswaldo Luiz Alves, Francisco Manoel dos Santos Garrido |
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| Rok vydání: | 1997 |
| Předmět: |
Inorganic chemistry
Analytical chemistry General Chemistry Activation energy Crystal structure Conductivity Atmospheric temperature range Condensed Matter Physics chemistry.chemical_compound Zirconium phosphate chemistry Fast ion conductor Ionic conductivity General Materials Science Powder diffraction |
| Zdroj: | Solid State Ionics. 100:127-134 |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/s0167-2738(97)00307-x |
| Popis: | The NASICON-type Na1.5Nb0.3Zr1.5(PO4)3 was prepared by solid state reaction of Nb2O5 and the precursor γ-NaHZr(PO4)2 at 700 °C. The EPR spectra showed a signal with a g factor of 1.984 assigned to Nb (IV) species in octahedral oxygen environments. The X-ray powder diffraction pattern obtained with monochromatic radiation was indexed on the basis of a rhombohedral cell, the hexagonal parameters being aH = 8.8061(2) and c H = 22.7638(7) A . The Na+ ion conduction was measured by the complex impedance method (frequency range: 0.1–105 Hz; temperature range: 20–500 °C) on four pellets previously sintered at 450, 750, 900 and 1000 °C. The conductivity data are discussed in relation to the sintering temperature. An activation energy of 0.60 eV for the movement of Na+ ions in the NASICON framework has been found. |
| Databáze: | OpenAIRE |
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