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The effect of Sr concentration on the crystal and magnetic structures of La1-xSrxFeO3-γ orthoferrite
Russian version
Sedykh V. D. 1, Rybchenko O. G. 1, Dmitriev A. I. 2, Kulakov V. I. 1, Gapochka A. M. 3, Rusakov V. S. 3
1Osipyan Institute of Solid State Physics RAS, Chernogolovka, Russia
2Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS, Сhernogolovka, Russia
3Lomonosov Moscow State University, Moscow, Russia
Email: sedykh@issp.ac.ru, orybch@issp.ac.ru, alex-dmitriev2005@yandex.ru, kulakov@issp.ac.ru, al-gap@physics.msu.ru, rusakovvs@mail.ru
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The structural and magnetic features of substituted La1-xSrxFeO3-γ have been studied, in both synthesized and vacuum-annealed samples, depending on the Sr content (for x=0.33 and 0.50), using X-ray diffraction, Mossbauer spectroscopy and magnetic measurements. It has been shown that in the as-prepared samples, the volume of the pseudocubic perovskite cell decreased and the number of vacancies and Fe4+ ions increased with an increase in the Sr concentration. The Neel temperatures were determined for two compositions of the compound: TN~233 K for the La0.5Sr0.5FeO3-γ sample and TN~385 K for the La0.67Sr0.33FeO3-γ sample. The contributions of Fe3+ ions with different local environments were redistributed under vacuum annealing. That led to changes in the JF/JAF ratio, a shift in the balance towards increasing antiferromagnetism, a noticeable increase in the Neel temperature TN, and a decrease in the width of the magnetic hysteresis loops and the magnetization value. Keywords: substituted lanthanum ferrites, orthoferrites, Fe valence states, oxygen vacancies, X-ray diffraction analysis, Mossbauer spectroscopy, magnetization.
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