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Título: | Electronic properties in intrinsically disordered double perovskites: Sr3MnMo2O9 and Ba3MnMo2O9 with Mo5+ valence state |
Autor: | López, C. A.; Saleta, M. E.; Pedregosa, J. C.; Sánchez, R. D.; Lamas, D. G.; Alonso, J. A. CSIC ORCID; Fernández-Díaz, M. T. | Palabras clave: | Neutron diffraction Impedance spectroscopy Magnetic measurements Electronic properties Crystal structures Inorganic materials |
Fecha de publicación: | 15-mar-2016 | Editor: | Elsevier | Citación: | Journal of Alloys and Compounds 661: 411-418 (2016) | Resumen: | Sr3MnMo2O9 and Ba3MnMo2O9 double perovskites with Mo5+ valence states have been prepared in polycrystalline form by thermal treatment, in reducing atmosphere (H2/N2 flow), of previously decomposed citrate precursors. These materials have been studied by X-ray and neutron powder diffraction (XRPD, NPD), magnetic and transport measurements. At room temperature, the crystal structure of Sr3MnMo2O9 is monoclinic, space group P21/n, with a = 5.6564(1) Å, b = 5.6383(1) Å, c = 7.9765(2) Å, β = 89.994(7)º; whereas Ba3MnMo2O9 presents a cubic lattice, space group Fm m, with a = 8.14900(8) Å. These samples present a frustrated magnetic interaction below to 12 and 9 K for Sr3MnMo2O9 and Ba3MnMo2O9, respectively. Semiconductor behaviour, observed either from d.c. or a.c. measurements, was modelled by a variable-range hopping mechanism. This transport behaviour is in accord with the electronic configurations Mn2+(3 d5)–Mo5+(4 d1) and supports the absence of mixed valence states in both double perovkites. | Versión del editor: | https://doi.org/10.1016/j.jallcom.2015.11.204 | URI: | http://hdl.handle.net/10261/186272 | DOI: | 10.1016/j.jallcom.2015.11.204 | Identificadores: | doi: 10.1016/j.jallcom.2015.11.204 issn: 0925-8388 |
Aparece en las colecciones: | (ICMM) Artículos |
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