X-ray studies of barium manganite Ba6Mn24O48 in the magnetic transition region
| Autor: | Yu. E. Stetsenko, Irina Legchenkova, K. A. Yagotintsev, A. I. Prokhvatilov |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Condensed matter physics General Physics and Astronomy chemistry.chemical_element Barium 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology Manganite 01 natural sciences Thermal expansion Condensed Matter::Materials Science Tetragonal crystal system Lattice constant chemistry 0103 physical sciences Crystallite 010306 general physics 0210 nano-technology Anisotropy |
| Zdroj: | Low Temperature Physics. 42:149-151 |
| ISSN: | 1090-6517 1063-777X |
| DOI: | 10.1063/1.4942583 |
| Popis: | X-ray studies of polycrystalline and pressure compacted barium manganite powder Ba6Mn24O48 were conducted at room and low temperatures. It was found that the compacting process that leads to the accumulation of macro- and microstress in the sample exerts a substantial amount of influence on the diffraction pattern. We obtained data for the temperature dependence of the lattice parameters a and c, as well as the linear thermal expansion coefficient in the basal plane of the tetragonal phase at temperatures 20–100 K. In the region of the magnetic phase transition temperature 45 K, we found an abnormal change in lattice parameter a and negative values for the linear thermal expansion coefficients αa. However, at the same time there were no singularities along the c(T) dependence. We suggest that one possible reason for this temperature behavior of the structural and thermal characteristics of barium manganite, is the significant anisotropy of the crystal lattice. |
| Databáze: | OpenAIRE |
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