期刊论文详细信息
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 卷:500
The influence of cation ordering and oxygen nonstoichiometry on magnetic properties of Sr2FeMoO6-x, around Curie temperature
Article
Kalanda, Nikolay1  Yarmolich, Marta1  Petrov, Alexander1  Raevski, Igor2,3  Kubrin, Stanislav2,3  Raevskaya, Svetlana2,3  Bobrikov, Ivan4  Lazavenka, Andrei5  Kim, Dong-Hyun6 
[1] NAS Belarus, Sci Pract Mat Res Ctr, P Brovka Str 19, Minsk 220072, BELARUS
[2] Southern Fed Univ, Phys Res Inst, R Zorghe Str 5, Rostov Na Donu 344090, Russia
[3] Southern Fed Univ, Fac Phys, R Zorghe Str 5, Rostov Na Donu 344090, Russia
[4] Joint Inst Nucl Res, IM Frank Lab Neutron Phys, Dubna 141980, Russia
[5] Belarusian State Univ Informat & Radioelect, P Brovka Str 6, Minsk 220013, BELARUS
[6] Chungbuk Natl Univ, Dept Phys, 410 Sungbong Ro, Cheongju 361763, Chungbuk, South Korea
关键词: Strontium ferromolybdate;    Oxygen nonstoichiometry;    Superstructural ordering;    Mossbauer spectroscopy;    Magnetization;    Exchange interactions;   
DOI  :  10.1016/j.jmmm.2019.166386
来源: Elsevier
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【 摘 要 】

Sr2FeMoO6-x polycrystalline samples with different oxygen content (6 - x) and various degrees of super-structural ordering of Fe/Mo cations (P) were obtained by the solid-phase method from the SrFeO2.52 and SrMoO4 precursors. From the investigation on the influence of oxygen non-stoichiometry and the P parameter on the magnetic properties of Sr2FeMoO6-x, it was found that with an increase in P and a decrease in the (6 - x) value from 5.99 to 5.94, an increase in the magnetization values is observed in the temperature range 77-600 K. For all the Sr2FeMoO6-x samples there is a tendency that P value rises with increasing x, where, accordingly, the volume fraction of regions in which there are no anti-structural defects increases as well. This is also indicated by Mossbauer spectroscopy data, confirming an increase in the area of the S1 sextet corresponding to Fe ions in highly ordered regions and a decrease in the area of the S2 sextet associated with disordered regions. Using the temperature scanning method, the temperatures of the onset and completion of the transition from the paramagnetic to the ferrimagnetic state and, correspondingly, the blurring width of the transition have been estimated. It turned out that with decreasing P, the blurring of the transition increases, which is associated with an increase in the concentration of anti-structural defects.

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