Electron microscopy, XRD, dielectric, and Mossbauer studies of Li-doped Pb(Fe_0.5Nb_0.5)O₃ ceramics sintered from mechanically activated powders

A. A. GusevInstitute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia

S. I. RaevskayaResearch Institute of Physics and Physical Faculty, Southern Federal University, Rostov-on-Don, Russia

I. P. RaevskiResearch Institute of Physics and Physical Faculty, Southern Federal University, Rostov-on-Don, RussiaCorrespondence[email protected]

V. P. IsupovInstitute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia

E. G. AvvakumovInstitute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia

S. P. KubrinResearch Institute of Physics and Physical Faculty, Southern Federal University, Rostov-on-Don, Russia

H. ChenInstitute of Applied Physics and Materials Engineering, Faculty of Science and Technology, University of Macau, Macau, China

V. V. TitovResearch Institute of Physics and Physical Faculty, Southern Federal University, Rostov-on-Don, Russia

T. A. MinasyanResearch Institute of Physics and Physical Faculty, Southern Federal University, Rostov-on-Don, Russia

C.- C. ChouNational Taiwan University of Science and Technology, Taipei, Taiwan

S. V. TitovResearch Institute of Physics and Physical Faculty, Southern Federal University, Rostov-on-Don, Russia

M. A. MalitskayaResearch Institute of Physics and Physical Faculty, Southern Federal University, Rostov-on-Don, Russia

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ABSTRACT

X-ray diffraction (XRD) studies of the phases formed on the surface of the Li-doped PbFe_0.5Nb_0.5O₃ (PFN) ceramics sintered under different conditions from the mechanically activated mixture of oxides and Li₂CO₃ have been carried out. At sintering temperatures exceeding 800°C a partial evaporation of PbO leads to the formation of pyrochlore Pb₂Fe₄Nb₄O₂₁ and lithium ferrites LiFeO₂ and LiFe₅O₈ phases in the surface layer about 100 μm thick. An increase of the Neel temperature by more than 40 K, as compared to single crystal, was achieved in the mechanically activated PFN powder sintered at 600°C.

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Funding

This study is partially supported by the Russian Foundation for Basic Research (RFBR) project 13–03-00869_a, Ministry of education and science of the Russian Federation (research projects 2132 and 3.1137. 2014K), Southern Federal University (grant 213.01–2014/012-VG), and Research Committee of the University of Macau under Research & Development Grant for Chair Professor No RDG007/FST-CHD/2012.

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Electron microscopy, XRD, dielectric, and Mossbauer studies of Li-doped Pb(Fe_0.5Nb_0.5)O₃ ceramics sintered from mechanically activated powders

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Electron microscopy, XRD, dielectric, and Mossbauer studies of Li-doped Pb(Fe0.5Nb0.5)O3 ceramics sintered from mechanically activated powders

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Electron microscopy, XRD, dielectric, and Mossbauer studies of Li-doped Pb(Fe_0.5Nb_0.5)O₃ ceramics sintered from mechanically activated powders