Magnetic behavior of Fe-doped of multicomponent bismuth niobate pyrochlore

被引:2
作者
Zhuk, Nadezhda A. [1 ]
Makeev, Boris A. [2 ]
Nekipelov, Sergey, V [3 ]
Yermolina, Maria, V [4 ]
Fedorova, Anna, V [5 ]
Chernykh, Galina, I [1 ]
机构
[1] Syktyvkar State Univ, Oktjabrsky Prospect 55, Syktyvkar 167001, Komi Republic, Russia
[2] Komi Sci Ctr UB RAS, Inst Geol, Pervomaiskaya St 54, Syktyvkar 167982, Komi Republic, Russia
[3] Komi Sci Ctr UB RAS, Inst Phys & Math, Oplesnina St 4, Syktyvkar 167982, Republic Of Kom, Russia
[4] Univ Illinois, 845 W Taylor St,MC 111, Chicago, IL 60607 USA
[5] St Petersburg State Univ, Univ Sky Pr 26, St Petersburg 198504, Russia
关键词
magnetic susceptibility; iron; NEXAFS; pyrochlore structural type; solid solutions; DIELECTRIC-PROPERTIES; PHASE-EQUILIBRIA; ELECTRICAL-PROPERTIES; OPTICAL-PROPERTIES; SYSTEM; CERAMICS; NANOCOMPOSITE; NEXAFS; EPR;
D O I
10.1515/rams-2021-0011
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Two series of iron-containing solid solutions Bi2Mg1-xFexNb2O9+delta and Bi2MgNb2-2xFe2xO9-delta of pyrochlore structure were obtained by the traditional solid phase synthesis method. The electronic state and character of exchange interactions of iron atoms in solid solutions were investigated by methods of magnetic dilution and NEXAFS-spectroscopy. According to X-ray spectroscopy and magnetic susceptibility data, iron(III) atoms are distributed mainly in octahedral positions of niobium(V) and in a dominant amount are in the charge state of Fe(III) in the form of monomers and exchange-bonded clusters mainly with antiferromagnetic type of exchange. Differences in magnetic behavior of iron-containing solid solutions of both series have been revealed. Antiferromagnetic and ferromagnetic exchange can be realized between iron atoms, which, with increasing concentration of paramagnetic atoms and averaging structure distortions, becomes less significant. The parameters of exchange interactions in clusters and distribution of iron paramagnetic atoms depending on the concentration of solid solutions have been calculated.
引用
收藏
页码:38 / 46
页数:9
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