Synthesis and Characterization of Pure and Doped (Na, Ca, Sr) Nanograined LaMnO3 Magnetoresistive Ceramics
| Autor: | Filippo Maglia, G. Spinolo, A. Tacca, Hasan Erdem Çamurlu, G. Chiodelli, L. Malavasi, Umberto Anselmi-Tamburini, M. C. Mozzati, Zuhair A. Munir |
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| Rok vydání: | 2008 |
| Předmět: |
LaMnO3
Materials science Magnetoresistance ceramic Doping Biomedical Engineering Analytical chemistry Spark plasma sintering chemistry.chemical_element Bioengineering General Chemistry Condensed Matter Physics Grain size law.invention SQUID magnetoresistive chemistry Electrical resistivity and conductivity law visual_art nanograined visual_art.visual_art_medium Lanthanum General Materials Science Ceramic |
| Zdroj: | Journal of nanoscience and nanotechnology info:cnr-pdr/source/autori:Maglia F., Malavasi L., Camurlu H. E., Tacca A., Chiodelli G., Spinolo G., Mozzati M. C., Anselmi-Tamburini U., Munir Z.A./titolo:Synthesis and characterization of pure and doped (Na, Ca, Sr) nanograined LaMnO3 magnetoresistive ceramics/doi:/rivista:Journal of nanoscience and nanotechnology (Print)/anno:2007/pagina_da:1/pagina_a:8/intervallo_pagine:1–8/volume:10 |
| ISSN: | 1533-4880 |
| DOI: | 10.1166/jnn.2008.b116 |
| Popis: | Pure and Na, Ca, and Sr doped lanthanum manganites (LaMnO3, La0.85Na0.15MnO3, La0.7Ca0.3MnO3, La0.7Sr0.3MnO3) were prepared in form of bulk nano-structured materials through a two-step process. Nanometric powders were synthesized by the Pechini method and subsequently densified by Spark Plasma Sintering at 1273 K for 5 minutes under a pressure of 140 MPa. The method allowed the preparation of single phase manganites with a theoretical density above 98% together with a very limited growth of the grain size. Grain sizes below 70 nm were obtained for all materials except La0.85Na0.15MnO3 which showed a much larger grain size. Curie temperatures (TC) and magnetoresistivity properties of the samples were measured by a Superconducting Quantum Interference Device (SQUID). The decrease in the resistivity below TC occurred in a much wider range of temperature compared to ceramics having micron-size grains. |
| Databáze: | OpenAIRE |
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