| Autor: |
Troyanchuk, I. O., Karpinskiĭ, D. V., Bushinskiĭ, M. V., Chobot, A. N., Pushkarev, N. V., Prohnenko, O., Kopcewicz, M., Szymczak, R. |
| Předmět: |
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| Zdroj: |
Crystallography Reports; Dec2009, Vol. 54 Issue 7, p1172-1178, 7p, 1 Diagram, 3 Charts, 5 Graphs |
| Abstrakt: |
Bi1 − xSr xFeO3 − x/2 (I), Bi1 − xSr xFe1 − xMn xO3 (II), and Bi1 − xCa xFe1 − xMn xO3 (III) solid solutions have been obtained. Their magnetization has been measured by X-ray and neutron diffraction and Mössbauer spectroscopy. According to the Mössbauer spectroscopy data, iron ions are in the trivalent state in system I. Near the concentration x ≈ 0.2, rhombohedral distortions (sp. gr. R3 c) are transformed into tetragonal ( P4/ mmm). The symmetry of system II changes at x > 0.2 ( R3 c → R3 c), whereas orthorhombic distortions ( R3 c → Pbnm) arise in system III at x > 0.2. The magnetic structure is antiferromagnetic (of G type). The samples of systems II and III exhibit weak ferromagnetism at x > 0.2 due to the Dzyaloshinski-Moriya interaction. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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