Abstract
Loop-shaped dependences of the electric polarization on the electric field strength (the dielectric hysteresis) are registered for the first time for polycrystalline Li-Ti ferrite. Temperature evolution of the hysteresis loop parameters is investigated for ferrite samples. A thermal Barkhausen effect is detected during heating and cooling of ferrite specimens prepolarized in an electric field. The results obtained can be interpreted from the viewpoint of the Maxwell-Wagner relaxation polarization or induced ferroelectric-like state in the electric ferrite subsystem.
Highlights
Ferrite ceramics of the lithium group are the materials with well-established magnetic properties [1,2,3]
It was shown that the experimental temperature dependences of the complex dielectric permittivity at the frequencies 102, 103, 104 and 106 Hz demonstrate a number of anomalies when measured at a high-level of the test signal (Etest=120 V/cm) at the frequency 102 Hz [2]
Based on the analysis of the data obtained, the authors put forward a hypothesis that an additional relaxation polarization process induced by the electric field might occur in the ferrite, which is characterized by ferroelectric behavior [5, 6]
Summary
Series: Materials Science and Engineering 81 (2015) 012010 doi:10.1088/1757-899X/81/1/012010. A V Malyshev, E V Nikolaev, A P Surzhikov and A N Zarubin2 1National Research Tomsk Polytechnic University, Tomsk, Russia 2National Research Tomsk State University, Tomsk, Russia
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