The Influence of Relative Content of a Metal Component in a Dielectric Matrix on the Formation and Dimensions of Cobalt Nanocrystallites in Co{sub x}(MgF{sub 2}){sub 100 –} {sub x} Film Composites

Journal Article · Thu Feb 14 23:00:00 EST 2019 · Physics of the Solid State

DOI:https://doi.org/10.1134/S1063783419020112· OSTI ID:22925370

Ivkov, S. A. ^[1]; Sitnikov, A. V.; Stognei, O. V. ^[2]; Kozakov, A. T.; Nikol’skii, A. V. ^[3]

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1. Voronezh State University (Russian Federation)
2. Voronezh State Technical University (Russian Federation)
3. Southern Federal University (Russian Federation)

The influence of relative content of a metal component on the phase composition and substructure of Co{sub x}(MgF{sub 2}){sub 100 –} {sub x} in a wide range of x = 16–63 at % is studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and infrared (IR) spectroscopy. The layers of nanocomposite with a micron thickness have been obtained by the ion-beam sputtering of the target in the argon environment. The results reveal that the relative metal cobalt content in the MgF{sub 2} dielectric matrix strongly affects the phase composition and substructure of nanocomposites. With a lower content of cobalt, it is in the amorphous state in the form of clusters in the MgF{sub 2} nanocrystalline matrix. An increase of cobalt content to x = 29 at % on a sitall substrate and to x = 42 at % on a glass substrate in the X-ray amorphous MgF{sub 2} dielectric matrix leads to the formation of cobalt nanocrystals with a hexagonal crystallographic system, whose sizes are on the order of 10 nm. These are predominately oriented in the basis plane of the (001) hexagonal lattice of α-Со. A further increase of cobalt content to c = 59 at % enlarges the α-Со nanocrystals to ~20 nm with retaining the same orientation. In accordance with a fine structure analysis of XPS spectra of Со 2p and О 1s, cobalt is strongly oxidized on the surface of all the composites; only on the surface of samples with a low content of Co is X‑ray amorphous cobalt found in a metallic state along with cobalt oxide. The IR spectra of these samples with the lowest metal phase content exhibit the pronounced modes from the nanocrystalline MgF{sub 2} dielectric phase.

• OSTI ID: 22925370
• Journal Information: Physics of the Solid State, Journal Name: Physics of the Solid State Journal Issue: 2 Vol. 61; ISSN 1063-7834
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMORPHOUS STATE
ARGON
COBALT
COBALT OXIDES
CRYSTALLOGRAPHY
DIELECTRIC MATERIALS
GLASS
HEXAGONAL LATTICES
INFRARED SPECTRA
ION BEAMS
MAGNESIUM FLUORIDES
NANOCOMPOSITES
NANOCRYSTALS
ORIENTATION
SPUTTERING
SURFACES
THICKNESS
THIN FILMS
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY