Solution sol–gel processing and investigation of percolation threshold in La2/3Ca1/3MnO3:xSiO2 nanocomposite
| Autor: | Dhirendra Bahadur, C M Srivastava, Dibakar Das, A. K. Nigam, Rabindra N. Das, P Chowdhury |
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| Rok vydání: | 2002 |
| Předmět: |
Nanocomposite
Materials science Magnetoresistance Condensed matter physics Crystal Lattices Synthesis (Chemical) Electric Conductivity Percolation threshold Condensed Matter Physics Electronic Optical and Magnetic Materials Electrical resistivity and conductivity Percolation (Solid State) Lattice (order) Volume fraction Crystallite Composite material Lanthanum Compounds Sol-gel |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 238:178-184 |
| ISSN: | 0304-8853 |
| Popis: | The composites of La2/3Ca1/3MnO3:xSiO2 (0less-than-or-equals, slantxless-than-or-equals, slant0.40) have been synthesized by sol–gel technique to derive homogeneous nanocomposites. Si4+ by virtue of its strong preference for tetrahedral site does not enter the perovskite lattice. The percolation threshold composition has been determined by resistivity measurements at around 90% volume fraction of LCMO. A detailed electrical, magnetic and magneto-transport characterizations have been carried out for composites around the threshold composition (x=0.05,0.10,0.15). The magnetoresistance results at 1 T show a sharp peak at Tc and a minimum just below Tc as reported in several polycrystalline LCMO composites. © Elsevier |
| Databáze: | OpenAIRE |
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