Evolution of structure and physical properties in Al-substituted Ba-hexaferrites

doi:10.1088/1674-1056/25/1/016102

中国物理B ›› 2016, Vol. 25 ›› Issue (1): 16102-016102.doi: 10.1088/1674-1056/25/1/016102

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Evolution of structure and physical properties in Al-substituted Ba-hexaferrites

Alex Trukhanov, Larisa Panina, Sergei Trukhanov, Vitalii Turchenko, Mohamed Salem

1. National University of Science and Technology MISiS, 119049, Moscow, Leninsky Prospekt, 4, Russia;
2. SSPA Scientific and Practical Materials Research Centre of NAS of Belarus, 220072 RB, Minsk, 19 P. Brovki Str., Russia;
3. Joint Institute for Nuclear Research, 141980, Dubna, 6 Joliot-Curie Street, Russia

收稿日期:2015-07-31 修回日期:2015-09-15 出版日期:2016-01-05 发布日期:2016-01-05
通讯作者: Alex Trukhanov E-mail:truhanov86@mail.ru
基金资助:
Project supported by the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST “MISiS” (Grant No. K4-2015-040). L. Panina acknowledges support under the Russian Federation State contract for organizing a scientific work.

Evolution of structure and physical properties in Al-substituted Ba-hexaferrites

Alex Trukhanov^1,2, Larisa Panina¹, Sergei Trukhanov², Vitalii Turchenko³, Mohamed Salem¹

1. National University of Science and Technology MISiS, 119049, Moscow, Leninsky Prospekt, 4, Russia;
2. SSPA Scientific and Practical Materials Research Centre of NAS of Belarus, 220072 RB, Minsk, 19 P. Brovki Str., Russia;
3. Joint Institute for Nuclear Research, 141980, Dubna, 6 Joliot-Curie Street, Russia

Received:2015-07-31 Revised:2015-09-15 Online:2016-01-05 Published:2016-01-05
Contact: Alex Trukhanov E-mail:truhanov86@mail.ru
Supported by:
Project supported by the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST “MISiS” (Grant No. K4-2015-040). L. Panina acknowledges support under the Russian Federation State contract for organizing a scientific work.

摘要/Abstract

摘要： The investigations of the crystal and magnetic structures of the BaFe_12-xAl_xO₁₉ (x=0.1-1.2) solid solutions have been performed with powder neutron diffractometry. Magnetic properties of the BaFe_12-xAl_xO₁₉ (x=0.1-1.2) solid solutions have been measured by vibration sample magnetometry at different temperatures under different magnetic fields. The atomic coordinates and lattice parameters have been Rietveld refined. The invar effect is observed in low temperature range (from 4.2 K to 150 K). It is explained by the thermal oscillation anharmonicity of atoms. The increase of microstress with decreasing temperature is found from Rietveld refinement. The Curie temperature and the change of total magnetic moment per formula unit are found for all compositions of the BaFe_12-xAl_xO₁₉ (x=0.1-1.2) solid solutions. The magnetic structure model is proposed. The most likely reasons and the mechanism of magnetic structure formation are discussed.

关键词: barium hexaferrites, neutron diffraction, crystal and magnetic structures

Abstract: The investigations of the crystal and magnetic structures of the BaFe_12-xAl_xO₁₉ (x=0.1-1.2) solid solutions have been performed with powder neutron diffractometry. Magnetic properties of the BaFe_12-xAl_xO₁₉ (x=0.1-1.2) solid solutions have been measured by vibration sample magnetometry at different temperatures under different magnetic fields. The atomic coordinates and lattice parameters have been Rietveld refined. The invar effect is observed in low temperature range (from 4.2 K to 150 K). It is explained by the thermal oscillation anharmonicity of atoms. The increase of microstress with decreasing temperature is found from Rietveld refinement. The Curie temperature and the change of total magnetic moment per formula unit are found for all compositions of the BaFe_12-xAl_xO₁₉ (x=0.1-1.2) solid solutions. The magnetic structure model is proposed. The most likely reasons and the mechanism of magnetic structure formation are discussed.

Key words: barium hexaferrites, neutron diffraction, crystal and magnetic structures

中图分类号: (Neutron diffraction)

61.05.fm

61.50.Nw (Crystal stoichiometry) 75.10.-b (General theory and models of magnetic ordering)

Alex Trukhanov, Larisa Panina, Sergei Trukhanov, Vitalii Turchenko, Mohamed Salem. Evolution of structure and physical properties in Al-substituted Ba-hexaferrites[J]. 中国物理B, 2016, 25(1): 16102-016102.

Alex Trukhanov, Larisa Panina, Sergei Trukhanov, Vitalii Turchenko, Mohamed Salem. Evolution of structure and physical properties in Al-substituted Ba-hexaferrites[J]. Chin. Phys. B, 2016, 25(1): 16102-016102.

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Evolution of structure and physical properties in Al-substituted Ba-hexaferrites

Evolution of structure and physical properties in Al-substituted Ba-hexaferrites

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