Dielectric properties of Cd1−x FexSe compounds

Żukowski, P.; Partyka, J.; Wagierek, P.; Shostak, Yu. A.; Sidorenko, Yu. V.; Rodzik, A.

doi:10.1134/1.1317568

Cited by 20 publications

(13 citation statements)

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“…Temperature dependence on permittivity can also be observed and specifically its increase along with the temperature growth. This is consistent with a model of thermally activated permittivity that is characteristic for the hopping exchange of electric charges [33,34].…”

Section: Methodssupporting

confidence: 89%

Inductive type properties of FeCoZr–CaF2 and FeCoZr–PZT nanocomposites

Kołtunowicz

2015

J Mater Sci: Mater Electron

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The paper presents investigations into frequency dependences of conductivity, capacitance and the phase angle h for nanocomposites (FeCoZr) x (CaF 2 ) (100-x) and (FeCoZr) x (PZT) (100-x) . The nanocomposites have been produced with the application of ion-beam sputtering using pure argon ions (oxygen-free materials) and mixed ions of argon and oxygen (oxygen materials). The phase angle versus frequency characteristics for the oxygen nanocomposites show a transition from negative to positive phase angle values along with the frequency increase. The maximum observed phase angle h values reach beyond the 90°. The phase angle transition through 0°is accompanied with the voltage resonance phenomenon that is represented by strong minima in the capacitance versus frequency curves. In the conductivity versus frequency characteristics, strong minima occur during the phase angle h transition through 90°, which corresponds to the occurrence of current resonance. Occurrence of the coilless inductance features in nanocomposites (FeCoZr) x (PZT) (100-x) and (FeCoZr) x (CaF 2 ) (100-x) , produced with the ion-beam sputtering using argon and oxygen ions, is related to the formation of a subsurface layer of metal oxides on the metallic phase nanogranules.

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Section: Methodssupporting

confidence: 89%

Inductive type properties of FeCoZr–CaF2 and FeCoZr–PZT nanocomposites

Kołtunowicz

2015

J Mater Sci: Mater Electron

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“…The model was improved in Ref. 36 to take the unequal distances between the nanoparticles and their size distribution into account, such that the lifetime (s m ) of an electron in a nanoparticle in Eq. 1 is not constant, having some distribution.…”

Section: Resultsmentioning

confidence: 99%

AC Hopping Conductance in Nanocomposite Films with Ferromagnetic Alloy Nanoparticles in a PbZrTiO3 Matrix

Kołtunowicz

Żukowski

Boiko

et al. 2015

Journal of Elec Materi

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In this work, the temperature and frequency dependences of the real part of the admittance [r(f, T)] of annealed nanocomposite films containing Co 45 Fe 45 Zr 10 -based nanoparticles covered with native oxides and embedded in a doped PbZrTiO 3 ferroelectric matrix were studied. The nanocomposites studied were deposited by ion sputtering a complex target in a mixed Ar/O 2 atmosphere followed by a 15-min annealing process (with steps of 25 K) in air in the temperature range of 398 K £ T a £ 573 K. The r(f, T) of the annealed samples was measured in the temperature range of 77 K < T p < 373 K at frequencies of 50 Hz < f < 1 MHz. The observed r(f, T) dependences confirmed that the annealed samples displayed the effects of negative capacitance over the whole frequency and temperature ranges studied because of the pronounced oxidation of the nanoparticles. The r(f, T) dependences obtained are described using an earlier-developed AC hopping conductance model. Comparisons between experimental and simulation results allow the model parameters to be estimated, such as the activation energies of the hopping conductance and the lifetimes of the electrons in the nanoparticles.

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“…It is clear that for both materials, in the frequency range of 40-1000 kHz, this behavior is abnormal -it increases with the increase in frequency. According to [17], it can be assumed that the emergence of additional dipoles is related to hopping recharge of defects the energy field of which is in vicinity of the Fermi level. The essentially greater magnitude of ε for TiO 2 , according to [18], just indicates a higher concentration of defects in it.…”

Section: Resultsmentioning

confidence: 99%

Gigantic Capacito-Energetic Parameters of Lithium-Intercalation Current Generation Reaction in Nanodispersed TiO₂with Defective Structure

et al. 2010

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To determine the reasons of the difference between the parameters of lithium intercalation process for materials of the same nature, the nanodispersed TiO 2 was synthesized by pyrogenic method from TiCl 4 in hydrogen-air flame with SiCl 4 doping precursor and was compared with TiO 2 of "Merck" quality. The X-ray analysis with the use of small-angle scattering method, electronic scanning microscopy and impedance spectroscopy were used to determine aforesaid parameters. Obtained results show that the reason of such behaviour lays in size effect and in modification of energetic topology of impurity system. Thermodynamic parameters of intercalation reaction agree well with investigated properties of ceramic samples.

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Dielectric properties of Cd1−x FexSe compounds

Cited by 20 publications

References 1 publication

Inductive type properties of FeCoZr–CaF2 and FeCoZr–PZT nanocomposites

Inductive type properties of FeCoZr–CaF2 and FeCoZr–PZT nanocomposites

AC Hopping Conductance in Nanocomposite Films with Ferromagnetic Alloy Nanoparticles in a PbZrTiO3 Matrix

Gigantic Capacito-Energetic Parameters of Lithium-Intercalation Current Generation Reaction in Nanodispersed TiO₂with Defective Structure

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Dielectric properties of Cd1−x FexSe compounds

Cited by 20 publications

References 1 publication

Inductive type properties of FeCoZr–CaF2 and FeCoZr–PZT nanocomposites

Inductive type properties of FeCoZr–CaF2 and FeCoZr–PZT nanocomposites

AC Hopping Conductance in Nanocomposite Films with Ferromagnetic Alloy Nanoparticles in a PbZrTiO3 Matrix

Gigantic Capacito-Energetic Parameters of Lithium-Intercalation Current Generation Reaction in Nanodispersed TiO2with Defective Structure

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Gigantic Capacito-Energetic Parameters of Lithium-Intercalation Current Generation Reaction in Nanodispersed TiO₂with Defective Structure