Temperature dependences of the dielectric properties of lithium-titanium ferrite ceramics

Малышев, А. В.; Peshev, V. V.; Pritulov, A. M.

doi:10.1134/1.1641950

Cited by 5 publications

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“…The anomalous behavior consisted in a sharp decrease in the values of the real part ε′ of dielectric permittivity in the vicinity of the magnetic Curie temperature (300°С). When these dependences were obtained at a low testsignal level (E test = 2.3 V/cm) at a fixed-bias voltage we also observed anomalies characteristic of ferroelectric, manifested as sharp changes in the values of ε′ and ε″ in narrow temperature intervals [4,5]. It was, therefore, suggested that the relaxational polarization is of ferroelectric nature [4,5].…”

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confidence: 74%

“…When these dependences were obtained at a low testsignal level (E test = 2.3 V/cm) at a fixed-bias voltage we also observed anomalies characteristic of ferroelectric, manifested as sharp changes in the values of ε′ and ε″ in narrow temperature intervals [4,5]. It was, therefore, suggested that the relaxational polarization is of ferroelectric nature [4,5].This work describes the experiments on determination of electric Barkhausen's pulses, non-linearity and hysteresis in the dependences P = f(E Р ) aimed at acquiring additional data on ferro-or anti-ferroelectric properties of Li-Ti-ferrite. Here, P and E Р are the polarization vector and electric field strength values, respectively.…”

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confidence: 75%

“…It should be noted that the temperature range 200-250°C (Е P = 62 V/cm) nearly coincides with that at which sharp stepwise variations occurred in the dependences for ε′(T) and ε″(T) measured with a bias [4,5]. Curves 2-4 exhibit a sharp decrease in in the pulse height at the same temperature of about 250 °C.…”

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confidence: 87%

“…In [4,5], it was shown that a ceramic material of the composition Li 0.649 Fe 1.598 Ti 0.5 Zn 0.2 Mn 0.051 O 4 with an addition of 0.22% Bi 2 O 3 can also possess ferroelectric properties.…”

Section: 226mentioning

confidence: 99%

“…The sintering technology and the process of specimen preparation were the same as in [4]. The specimens were shaped as tablets measuring 13 mm in diameter, with silver contacts deposited onto their surface by thermal evaporation in vacuum.…”

Section: 226mentioning

confidence: 99%

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Hysteresis of dielectric properties of Li-Ti-Ferrite ceramics

2004

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537.226Field dependences of Li-Ti ferrite ceramics polarization are obtained. When related to temperature, these dependences exhibit either non-linear behavior or non-linearity and hysteresis. Electric Barkhausen's pulses are revealed. Temperature dependences of the electric pulse heights are obtained after re-polarization of the specimens in the electric fields of different strengths. The results provide evidence on the presence of ferroelectric properties in Li-Ti ferrite ceramics.The ferrite ceramics of the lithium group are materials whose properties have been extensively studied [1][2][3]. In [4,5], it was shown that a ceramic material of the composition Li 0.649 Fe 1.598 Ti 0.5 Zn 0.2 Mn 0.051 O 4 with an addition of 0.22% Bi 2 O 3 can also possess ferroelectric properties.We have obtained temperature dependences of the complex dielectric permittivity at the frequencies 10 2 , 10 3 , 10 4 and 10 6 Hz, which exhibited anomalies when the measurements were made at a high level test-signal (E test = 120 V/cm) at a frequency of 10 2 Hz [4]. The anomalous behavior consisted in a sharp decrease in the values of the real part ε′ of dielectric permittivity in the vicinity of the magnetic Curie temperature (300°С). When these dependences were obtained at a low testsignal level (E test = 2.3 V/cm) at a fixed-bias voltage we also observed anomalies characteristic of ferroelectric, manifested as sharp changes in the values of ε′ and ε″ in narrow temperature intervals [4,5]. It was, therefore, suggested that the relaxational polarization is of ferroelectric nature [4,5].This work describes the experiments on determination of electric Barkhausen's pulses, non-linearity and hysteresis in the dependences P = f(E Р ) aimed at acquiring additional data on ferro-or anti-ferroelectric properties of Li-Ti-ferrite. Here, P and E Р are the polarization vector and electric field strength values, respectively.The sintering technology and the process of specimen preparation were the same as in [4]. The specimens were shaped as tablets measuring 13 mm in diameter, with silver contacts deposited onto their surface by thermal evaporation in vacuum. The contact diameter and the specimen thickness were 5 and 0.24 mm, respectively.Observation of the electric Barkhausen's pulses was performed in a setup shown in Fig. 1, whose flow block is given in the insert to the figure. Measurements were made in the course of slow (2°/min) heating of the specimens within the temperature interval T = 25-330°C. A bias voltage was applied to the specimens. Detection of the electric pulses was done with a computer-controlled Velleman oscilloscope. In order to identify non-linearity and hysteresis of dielectric characteristics, the dependence of C on E P was measured at different temperatures, where C is the specimen capacitance. The capacitance measurements were made with an Е7-14 automatic LCR-meter. The dependence P = f(E P ) was obtained by a graphic integration of the curves C = f(E P ).A typical pulse form is shown in Fig. 1. Figure 2 depicts the tempe...

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confidence: 87%

Section: 226mentioning

confidence: 99%

Section: 226mentioning

confidence: 99%

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Hysteresis of dielectric properties of Li-Ti-Ferrite ceramics

2004

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Anomalies of dielectric properties in a polycrystalline lithium-titanium ferrite

Малышев

Peshev

2007

Russ Phys J

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A. V. Malyshev and V. V. Peshev UDC 537.226 For the first time a dielectric hysteresis is observed in a polycrystalline lithium-titanium ferrite in the temperature range 475-575 K. A thermal Barkhausen effect is detected during heating and cooling of ferrite specimens prepolarized in an electric field. The results provide evidence on the formation of properties similar to ferroelectric ones in lithium-titanium ferrites under certain conditions.

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Investigation into the special features of the dielectric and polarization properties of lithiumtitanium ferrite ceramics

Малышев

2011

Russ Phys J

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A. V. MalyshevUDC 537.226Loop-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. 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.

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Temperature dependences of the dielectric properties of lithium-titanium ferrite ceramics

Cited by 5 publications

References 7 publications

Hysteresis of dielectric properties of Li-Ti-Ferrite ceramics

Hysteresis of dielectric properties of Li-Ti-Ferrite ceramics

Anomalies of dielectric properties in a polycrystalline lithium-titanium ferrite

Investigation into the special features of the dielectric and polarization properties of lithiumtitanium ferrite ceramics

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