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Título: | High pressure synthesis and properties of Bi0.5Pb0.5CrO3: A novel Cr4+/Cr3+ perovskite |
Autor: | Pirrotta, Ivan; Schmidt, Rainer; Dos Santos-García, Antonio J.; García-Hernández, Mar CSIC ORCID ; Morán, Emilio; Alario-Franco, Miquel Á. | Palabras clave: | Electrical properties Magnetic properties Bismuth-lead-chromium oxides Perovskites High pressure synthesis |
Fecha de publicación: | may-2015 | Editor: | Elsevier | Citación: | Journal of Solid State Chemistry 225: 321-329 (2015) | Resumen: | We have synthesized a new Bi0.5Pb0.5CrO3 perovskite phase by means of a high pressure reaction at 70 kbar and 1000 °C. The distorted orthorhombic perovskite structure can be indexed in the space group Pnma with lattice parameters a=5.4768 (1) Å, b=7.7450 (2) Å, and c=5.4574 (1) Å at room temperature, but undergoes a structural phase transition and enters into a P21/m monoclinic distorted perovskite phase below 150 K with a=5.4173 (2), b=7.7286 (4) and c=5.4930 (3). The structural transition is coincident with the onset of magnetic interactions. At lower temperatures a weak ferromagnetic structure is evident related to antiferromagnetic Cr-spin canting and a spin-glass transition is observed at ≈40 K. The semiconducting-type electrical resistivity is relatively low, associated with Cr3+/Cr4+ electron hopping, and shows considerable magneto-resistance (up to 15%). Due to the low resistivity the dielectric permittivity εr could be determined only below T<80 K to be ≈300 and did not show any strong temperature-dependence. Ferroelectricity was not detected in the T-range investigated and no magnetocapacitance effects were observed. | Versión del editor: | https://doi.org/10.1016/j.jssc.2014.10.027 | URI: | http://hdl.handle.net/10261/184369 | DOI: | 10.1016/j.jssc.2014.10.027 | Identificadores: | doi: 10.1016/j.jssc.2014.10.027 issn: 0022-4596 |
Aparece en las colecciones: | (ICMM) Artículos |
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