Influence of sputtering atmosphere on hopping conductance in granular nanocomposite (FeCoZr)(x)(Al2O3)(1-x) films
Nema prikaza
Autori
Svito, I.Fedotova, J. A.
Milosavljević, Momir
Zhukowski, P.
Koltunowicz, T. N.
Saad, A.
Kierczynski, Konrad
Fedotov, A. K.
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
The present paper investigates conductivity sigma for a wide temperature range of 2 K LT T LT 300 K in the nanocomposite (FeCoZr)(x)(Al2O3)(1-x) films (1-6 mu m thicknesses, 0.30 LT x LT 1.00) which were sputtered on glass-ceramic substrates from the compound target in vacuum chamber filled with Ar (set 1 films) or Ar + O-2 gas mixture (set 2 films). TEM and HRTEM images revealed that granular films of set 1 containing nanosized crystalline metallic bcc alpha-FeCo-based nanoparticles embedded in the amorphous Al2O3 matrix. In case of Ar + O atmosphere of deposited alpha-FeCo-based crystalline cores with stabilized sizes were covered with an amorphous FeCo-based oxide shells. The sigma(T) dependences were found to be in agreement with this phase structure. They show transition of the set 1 films sigma(T) curves with x from tunneling (hopping) behavior below the percolation threshold x LT x(c) approximate to 0.46 to metallic one for x GT x(c). Moreover, as opposed to such behavior, for t...he set 2 films hopping mechanism of sigma(T) was revealed far beyond x(c) due to the formation of semiconducting FeCo-based oxide shells separating electrically contacting FeCoZr cores. (C) 2013 Elsevier B.V. All rights reserved.
Ključne reči:
Electronic transport / Nanocomposites / PercolationIzvor:
Journal of Alloys and Compounds, 2014, 615, S344-S347Finansiranje / projekti:
- VISBY Program of the Swedish Institute, Belarusian State Sub-Programme Crystalline and Molecular Structures [2.4.12], Iuventus Plus program of Polish Ministry of Science and Higher Education [IP2012 026572]
Napomena:
- International Symposium on Metastable, Amorphous and Nanostructured Materials (ISMANAM), Jun 30-Jul 05, 2013, Torino, Italy
DOI: 10.1016/j.jallcom.2013.12.061
ISSN: 0925-8388; 1873-4669
WoS: 000343613600072
Scopus: 2-s2.0-84907509026
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Svito, I. AU - Fedotova, J. A. AU - Milosavljević, Momir AU - Zhukowski, P. AU - Koltunowicz, T. N. AU - Saad, A. AU - Kierczynski, Konrad AU - Fedotov, A. K. PY - 2014 UR - https://vinar.vin.bg.ac.rs/handle/123456789/7039 AB - The present paper investigates conductivity sigma for a wide temperature range of 2 K LT T LT 300 K in the nanocomposite (FeCoZr)(x)(Al2O3)(1-x) films (1-6 mu m thicknesses, 0.30 LT x LT 1.00) which were sputtered on glass-ceramic substrates from the compound target in vacuum chamber filled with Ar (set 1 films) or Ar + O-2 gas mixture (set 2 films). TEM and HRTEM images revealed that granular films of set 1 containing nanosized crystalline metallic bcc alpha-FeCo-based nanoparticles embedded in the amorphous Al2O3 matrix. In case of Ar + O atmosphere of deposited alpha-FeCo-based crystalline cores with stabilized sizes were covered with an amorphous FeCo-based oxide shells. The sigma(T) dependences were found to be in agreement with this phase structure. They show transition of the set 1 films sigma(T) curves with x from tunneling (hopping) behavior below the percolation threshold x LT x(c) approximate to 0.46 to metallic one for x GT x(c). Moreover, as opposed to such behavior, for the set 2 films hopping mechanism of sigma(T) was revealed far beyond x(c) due to the formation of semiconducting FeCo-based oxide shells separating electrically contacting FeCoZr cores. (C) 2013 Elsevier B.V. All rights reserved. T2 - Journal of Alloys and Compounds T1 - Influence of sputtering atmosphere on hopping conductance in granular nanocomposite (FeCoZr)(x)(Al2O3)(1-x) films VL - 615 SP - S344 EP - S347 DO - 10.1016/j.jallcom.2013.12.061 ER -
@article{ author = "Svito, I. and Fedotova, J. A. and Milosavljević, Momir and Zhukowski, P. and Koltunowicz, T. N. and Saad, A. and Kierczynski, Konrad and Fedotov, A. K.", year = "2014", abstract = "The present paper investigates conductivity sigma for a wide temperature range of 2 K LT T LT 300 K in the nanocomposite (FeCoZr)(x)(Al2O3)(1-x) films (1-6 mu m thicknesses, 0.30 LT x LT 1.00) which were sputtered on glass-ceramic substrates from the compound target in vacuum chamber filled with Ar (set 1 films) or Ar + O-2 gas mixture (set 2 films). TEM and HRTEM images revealed that granular films of set 1 containing nanosized crystalline metallic bcc alpha-FeCo-based nanoparticles embedded in the amorphous Al2O3 matrix. In case of Ar + O atmosphere of deposited alpha-FeCo-based crystalline cores with stabilized sizes were covered with an amorphous FeCo-based oxide shells. The sigma(T) dependences were found to be in agreement with this phase structure. They show transition of the set 1 films sigma(T) curves with x from tunneling (hopping) behavior below the percolation threshold x LT x(c) approximate to 0.46 to metallic one for x GT x(c). Moreover, as opposed to such behavior, for the set 2 films hopping mechanism of sigma(T) was revealed far beyond x(c) due to the formation of semiconducting FeCo-based oxide shells separating electrically contacting FeCoZr cores. (C) 2013 Elsevier B.V. All rights reserved.", journal = "Journal of Alloys and Compounds", title = "Influence of sputtering atmosphere on hopping conductance in granular nanocomposite (FeCoZr)(x)(Al2O3)(1-x) films", volume = "615", pages = "S344-S347", doi = "10.1016/j.jallcom.2013.12.061" }
Svito, I., Fedotova, J. A., Milosavljević, M., Zhukowski, P., Koltunowicz, T. N., Saad, A., Kierczynski, K.,& Fedotov, A. K.. (2014). Influence of sputtering atmosphere on hopping conductance in granular nanocomposite (FeCoZr)(x)(Al2O3)(1-x) films. in Journal of Alloys and Compounds, 615, S344-S347. https://doi.org/10.1016/j.jallcom.2013.12.061
Svito I, Fedotova JA, Milosavljević M, Zhukowski P, Koltunowicz TN, Saad A, Kierczynski K, Fedotov AK. Influence of sputtering atmosphere on hopping conductance in granular nanocomposite (FeCoZr)(x)(Al2O3)(1-x) films. in Journal of Alloys and Compounds. 2014;615:S344-S347. doi:10.1016/j.jallcom.2013.12.061 .
Svito, I., Fedotova, J. A., Milosavljević, Momir, Zhukowski, P., Koltunowicz, T. N., Saad, A., Kierczynski, Konrad, Fedotov, A. K., "Influence of sputtering atmosphere on hopping conductance in granular nanocomposite (FeCoZr)(x)(Al2O3)(1-x) films" in Journal of Alloys and Compounds, 615 (2014):S344-S347, https://doi.org/10.1016/j.jallcom.2013.12.061 . .