Enhancement of negative capacitance effect in (CoFeZr)(x)(CaF2)((100-x)) nanocomposite films deposited by ion beam sputtering in argon and oxygen atmosphere
Nema prikaza
Autori
Koltunowicz, T. N.Zhukowski, P.
Bondariev, V.
Saad, A.
Fedotova, J. A.
Fedotov, A. K.
Milosavljević, Momir
Kasiuk, J. V.
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
The paper presents frequency f and temperature T-p dependences of phase shift angle Theta, admittance sigma and capacitance C-p for the as-deposited and annealed (CoFeZr)(x)(CaF2)((100-x)) nanocomposite films deposited by ion-beam sputtering of a compound target in a mixed argon-oxygen gas atmosphere in vacuum chamber. The studied films presented metallic FeCoZr cores covered with FeCo-based oxide shells embedded into oxygen-free dielectric matrix (fluorite). It was found for the metallic phase content within the range of 52.2 at.% LT = x LT = 84.3 at.% in low-f region that Theta values were negative, while in the high-f region we observed the Theta LT 0 degrees. It was obtained that the f-dependences of capacitance module displayed minimum at the corresponding frequency when the Theta(f) crossed its zero line Theta = 0 degrees. It was also observed that the sigma(T-p) dependence displayed the occurrence of two minima that were related to the values of Theta(1) = 90 degrees (the first ...minimum) and of Theta(2)= -90 degrees (the second one). Some possible reasons of such behavior of (CoFeZr)(x)(CaF2)((100-x)) nanocomposite films are discussed. (C) 2013 Elsevier B.V. All rights reserved.
Ključne reči:
Electronic transport / Hopping conductance / Nanocomposites / PercolationIzvor:
Journal of Alloys and Compounds, 2014, 615, S361-S365Finansiranje / projekti:
- Iuventus Plus program of Polish Ministry of Science and Higher Education [IP2012 026572], Visby Program of Swedish Institute, State Sub-Programme Crystalline and molecular systems of Belarus
Napomena:
- International Symposium on Metastable, Amorphous and Nanostructured Materials (ISMANAM), Jun 30-Jul 05, 2013, Torino, Italy
DOI: 10.1016/j.jallcom.2013.12.125
ISSN: 0925-8388; 1873-4669
WoS: 000343613600076
Scopus: 2-s2.0-84907551190
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Koltunowicz, T. N. AU - Zhukowski, P. AU - Bondariev, V. AU - Saad, A. AU - Fedotova, J. A. AU - Fedotov, A. K. AU - Milosavljević, Momir AU - Kasiuk, J. V. PY - 2014 UR - https://vinar.vin.bg.ac.rs/handle/123456789/7040 AB - The paper presents frequency f and temperature T-p dependences of phase shift angle Theta, admittance sigma and capacitance C-p for the as-deposited and annealed (CoFeZr)(x)(CaF2)((100-x)) nanocomposite films deposited by ion-beam sputtering of a compound target in a mixed argon-oxygen gas atmosphere in vacuum chamber. The studied films presented metallic FeCoZr cores covered with FeCo-based oxide shells embedded into oxygen-free dielectric matrix (fluorite). It was found for the metallic phase content within the range of 52.2 at.% LT = x LT = 84.3 at.% in low-f region that Theta values were negative, while in the high-f region we observed the Theta LT 0 degrees. It was obtained that the f-dependences of capacitance module displayed minimum at the corresponding frequency when the Theta(f) crossed its zero line Theta = 0 degrees. It was also observed that the sigma(T-p) dependence displayed the occurrence of two minima that were related to the values of Theta(1) = 90 degrees (the first minimum) and of Theta(2)= -90 degrees (the second one). Some possible reasons of such behavior of (CoFeZr)(x)(CaF2)((100-x)) nanocomposite films are discussed. (C) 2013 Elsevier B.V. All rights reserved. T2 - Journal of Alloys and Compounds T1 - Enhancement of negative capacitance effect in (CoFeZr)(x)(CaF2)((100-x)) nanocomposite films deposited by ion beam sputtering in argon and oxygen atmosphere VL - 615 SP - S361 EP - S365 DO - 10.1016/j.jallcom.2013.12.125 ER -
@article{ author = "Koltunowicz, T. N. and Zhukowski, P. and Bondariev, V. and Saad, A. and Fedotova, J. A. and Fedotov, A. K. and Milosavljević, Momir and Kasiuk, J. V.", year = "2014", abstract = "The paper presents frequency f and temperature T-p dependences of phase shift angle Theta, admittance sigma and capacitance C-p for the as-deposited and annealed (CoFeZr)(x)(CaF2)((100-x)) nanocomposite films deposited by ion-beam sputtering of a compound target in a mixed argon-oxygen gas atmosphere in vacuum chamber. The studied films presented metallic FeCoZr cores covered with FeCo-based oxide shells embedded into oxygen-free dielectric matrix (fluorite). It was found for the metallic phase content within the range of 52.2 at.% LT = x LT = 84.3 at.% in low-f region that Theta values were negative, while in the high-f region we observed the Theta LT 0 degrees. It was obtained that the f-dependences of capacitance module displayed minimum at the corresponding frequency when the Theta(f) crossed its zero line Theta = 0 degrees. It was also observed that the sigma(T-p) dependence displayed the occurrence of two minima that were related to the values of Theta(1) = 90 degrees (the first minimum) and of Theta(2)= -90 degrees (the second one). Some possible reasons of such behavior of (CoFeZr)(x)(CaF2)((100-x)) nanocomposite films are discussed. (C) 2013 Elsevier B.V. All rights reserved.", journal = "Journal of Alloys and Compounds", title = "Enhancement of negative capacitance effect in (CoFeZr)(x)(CaF2)((100-x)) nanocomposite films deposited by ion beam sputtering in argon and oxygen atmosphere", volume = "615", pages = "S361-S365", doi = "10.1016/j.jallcom.2013.12.125" }
Koltunowicz, T. N., Zhukowski, P., Bondariev, V., Saad, A., Fedotova, J. A., Fedotov, A. K., Milosavljević, M.,& Kasiuk, J. V.. (2014). Enhancement of negative capacitance effect in (CoFeZr)(x)(CaF2)((100-x)) nanocomposite films deposited by ion beam sputtering in argon and oxygen atmosphere. in Journal of Alloys and Compounds, 615, S361-S365. https://doi.org/10.1016/j.jallcom.2013.12.125
Koltunowicz TN, Zhukowski P, Bondariev V, Saad A, Fedotova JA, Fedotov AK, Milosavljević M, Kasiuk JV. Enhancement of negative capacitance effect in (CoFeZr)(x)(CaF2)((100-x)) nanocomposite films deposited by ion beam sputtering in argon and oxygen atmosphere. in Journal of Alloys and Compounds. 2014;615:S361-S365. doi:10.1016/j.jallcom.2013.12.125 .
Koltunowicz, T. N., Zhukowski, P., Bondariev, V., Saad, A., Fedotova, J. A., Fedotov, A. K., Milosavljević, Momir, Kasiuk, J. V., "Enhancement of negative capacitance effect in (CoFeZr)(x)(CaF2)((100-x)) nanocomposite films deposited by ion beam sputtering in argon and oxygen atmosphere" in Journal of Alloys and Compounds, 615 (2014):S361-S365, https://doi.org/10.1016/j.jallcom.2013.12.125 . .