Baza Publikacji Pracowników Politechniki Lubelskiej

Status:
Autorzy:	Svito Ivan A., Fedotova Julia A., Milosavljević Momir, Żukowski Paweł, Kołtunowicz Tomasz, Saad Anis M., Kierczyński Konrad, Fedotov Aleksander K.
Rok wydania:	2013
Wersja dokumentu:	Drukowana \| Elektroniczna
Język:	angielski
Wolumen/Tom:	615
Strony:	344 - 347
Impact Factor:	2,726
Web of Science® Times Cited:	0
Scopus® Cytowania:	39
Bazy:	Web of Science \| Scopus
Efekt badań statutowych	NIE
Materiał konferencyjny:	NIE
Publikacja OA:	NIE
Abstrakty:	angielski
	The present paper investigates conductivity σ for a wide temperature range of 2 K < T < 300 K in the nanocomposite (FeCoZr)x(Al2O3)1−x films (1–6 μm thicknesses, 0.30 < x < 1.00) which were sputtered on glass–ceramic substrates from the compound target in vacuum chamber filled with Ar (set 1 films) or Ar + O2 gas mixture (set 2 films). TEM and HRTEM images revealed that granular films of set 1 containing nanosized crystalline metallic bcc α-FeCo-based nanoparticles embedded in the amorphous Al2O3 matrix. In case of Ar + O atmosphere of deposited α-FeCo-based crystalline “cores” with stabilized sizes were covered with an amorphous FeCo-based oxide “shells”. The σ(T) dependences were found to be in agreement with this phase structure. They show transition of the set 1 films σ(T) curves with x from tunneling (hopping) behavior below the percolation threshold x < xC ≈ 0.46 to metallic one for x > xC. Moreover, as opposed to such behavior, for the set 2 films hopping mechanism of σ(T) was revealed far beyond xC due to the formation of semiconducting FeCo-based oxide “shells” separating electrically contacting FeCoZr cores.

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Influence of sputtering atmosphere on hopping conductance in granular nanocomposite (FeCoZr)x(Al2O3)1−x films

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