Dielectric Properties of Lithium–Titanium Ferrite Ceramics

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

doi:10.1023/b:rupj.0000008199.29313.28

Cited by 4 publications

(7 citation statements)

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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: 71%

“…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: 79%

“…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.…”

mentioning

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%

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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: 79%

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confidence: 87%

Section: 226mentioning

confidence: 99%

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Hysteresis of dielectric properties of Li-Ti-Ferrite ceramics

2004

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“…3), where R1, С1 and R2, C2 are respectively active resistance and capacity reactance of the grains and grain boundaries. The conductivity growth at frequency becomes clear in consideration of the fact that the high-resistance polycrystalline intergrain boundaries "bridging" takes place on the ac field at a certain signal frequency [9].…”

Section: Fig 2 Frequency and Temperature σ Dependence Graphic Chartmentioning

confidence: 99%

Temperature Frequency Characteristics of Charge Transition in the Li0.5Fe2.4Ti0.1O4 Non-stoichiometric System

Gasyuk

Угорчук

Kaykan

et al. 2014

jpnu

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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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Dielectric Properties of Lithium–Titanium Ferrite Ceramics

Cited by 4 publications

References 5 publications

Hysteresis of dielectric properties of Li-Ti-Ferrite ceramics

Hysteresis of dielectric properties of Li-Ti-Ferrite ceramics

Temperature Frequency Characteristics of Charge Transition in the Li0.5Fe2.4Ti0.1O4 Non-stoichiometric System

Anomalies of dielectric properties in a polycrystalline lithium-titanium ferrite

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