Characterization of SrBiMn2?xTixO6 perovskites: Local ordering influence on the dielectric and magnetic response |
| |
| Affiliation: | 1. Dpto. Química Inorgánica I, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain;2. Institut Laue Langevin, 71 Av. des Martyrs, F38042 Grenoble, France;3. Instituto de Ciencia de Materiales, CSIC, Cantoblanco, 28049 Madrid, Spain;1. SPECIFIC – College of Engineering, Swansea University, Baglan Bay Innovation & Knowledge Centre, Central Avenue, Baglan, Port Talbot SA12 7AX, United Kingdom;2. University of Bath – Department of Chemistry, 1 South 1.20, Bath BA27AY, United Kingdom;1. Department of Bio and Nano Technology Engineering, Faith University, B.Çekmece, 34500 Istanbul, Turkey;2. Department of Chemistry, Fatih University, B.Çekmece, 34500 Istanbul, Turkey;3. Department of Software Engineering, Istanbul Sabahattin Zaim University, Halkali Cad., K.Çekmece, 34303 Istanbul, Turkey;1. School of Materials Science and Engineering, University of Jinan, Jinan 250022, China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China;1. School of Materials Science and Engineering, University of Jinan, Jinan 250022, China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China;1. School of Chemistry, Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;2. Shanxi Province Key Laboratory of Functional Nanocomposites, North University of China, Taiyuan 030051, China;1. Department of Physics, Faculty of Sciences, Selcuk University, Konya, Turkey;2. Department of Physics, Faculty of Arts and Sciences, Mustafa Kemal University, Hatay, Turkey;3. Department of Metallurgical and Materials Engineering, Faculty of Technology, Iskenderun Technical University, Hatay, Turkey |
| |
| Abstract: | Two new phases in the (SrTiO3)-(BiMnO3) perovskite type system were studied. These SrBiMn2?xTixO6 (x=0.5 and 0.75) ceramics were prepared by the liquid-mix method as polycrystalline powders. They were characterized by neutron diffraction (ND), electrical and magnetic measurements and these results were analysed in connection with the x=0.25 phase, previously described by us. Their crystal structures were fitted in the tetragonal I4/mcm space group, with additional superstructure reflections suggesting local ordering. Electron microscopy results revealed these ordering effects are actually present concerning both perovskite sublattices. The electrical response pointed to a mechanism consisting in variable range hopping of polarons. A relaxor ferroelectric behaviour dependent on the pellets thickness was found with Tm in the 140–240 K range. The magnetic structures imply an incommensurable modulation of the magnetic moments along the c or a directions, depending on the substitution degree x. A cluster picture in terms of chemically different nanoregions responsible of the macroscopic response is discussed. |
| |
| Keywords: | Perovskites Dielectrics Neutron Diffraction Relaxor Ferroelectrics |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
