TY  - JOUR
AU  - Cherneva, Sabina
AU  - Iankov, ROumen
AU  - Radić, Nenad
AU  - Grbić, Boško
AU  - Datcheva, Maria
AU  - Stoychev, Dimitar
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2184
AB  - The aim of the present work is to determine the indentation hardness (HIT) and indentation modulus (EIT) of pure TiO2 and WO3 thin films, as well as thin films composed of different TiO2 and WO3 proportions and deposited by spray pyrolysis on a stainless-steel (OC 404) substrate. Since the HIT and EIT of the films are properties expected to depend on the phase-chemical composition, morphology, structure and their changes when increasing the WO3 content in the TiO2-WO3 composite film, the correlation between the mechanical and structural properties is also addressed. The obtained results show that HIT and EIT strongly depend on the concentration of the co-deposited WO3. The determined values of HIT and EIT noticeably decrease (in comparison with HIT and EIT of the pure (100 %) TiO2 layer) when very low concentrations of WO3 (up to 2.5 % of W) are co-deposited. At higher concentrations of the co-deposited WO3 (more than 2.5 % of W), the HIT and EIT values increase almost linearly with an increase of the WO3 in the precursor. The observed non-proportional behavior of HIT and EIT is associated with specific changes of the structure and a development of defects in the deposited TiO2-WO3 composite phase, as well as with the increase in the amount of the formed separate WO3 phase (with increasing of WO3 (H2W3O12) in the working solution) surrounded by solitary TiO2 particles.
PB  - Institute of Metals and Technology
T2  - Materiali in Tehnologije
T1  - Nano-indentation investigations of the mechanical properties of thin tio2, wo3 and their composites layers, deposited by spray pyrolysis
VL  - 51
IS  - 1
SP  - 75
EP  - 83
DO  - 10.17222/mit.2015.216
ER  - 

@article{
author = "Cherneva, Sabina and Iankov, ROumen and Radić, Nenad and Grbić, Boško and Datcheva, Maria and Stoychev, Dimitar",
year = "2017",
abstract = "The aim of the present work is to determine the indentation hardness (HIT) and indentation modulus (EIT) of pure TiO2 and WO3 thin films, as well as thin films composed of different TiO2 and WO3 proportions and deposited by spray pyrolysis on a stainless-steel (OC 404) substrate. Since the HIT and EIT of the films are properties expected to depend on the phase-chemical composition, morphology, structure and their changes when increasing the WO3 content in the TiO2-WO3 composite film, the correlation between the mechanical and structural properties is also addressed. The obtained results show that HIT and EIT strongly depend on the concentration of the co-deposited WO3. The determined values of HIT and EIT noticeably decrease (in comparison with HIT and EIT of the pure (100 %) TiO2 layer) when very low concentrations of WO3 (up to 2.5 % of W) are co-deposited. At higher concentrations of the co-deposited WO3 (more than 2.5 % of W), the HIT and EIT values increase almost linearly with an increase of the WO3 in the precursor. The observed non-proportional behavior of HIT and EIT is associated with specific changes of the structure and a development of defects in the deposited TiO2-WO3 composite phase, as well as with the increase in the amount of the formed separate WO3 phase (with increasing of WO3 (H2W3O12) in the working solution) surrounded by solitary TiO2 particles.",
publisher = "Institute of Metals and Technology",
journal = "Materiali in Tehnologije",
title = "Nano-indentation investigations of the mechanical properties of thin tio2, wo3 and their composites layers, deposited by spray pyrolysis",
volume = "51",
number = "1",
pages = "75-83",
doi = "10.17222/mit.2015.216"
}

Cherneva, S., Iankov, R., Radić, N., Grbić, B., Datcheva, M.,& Stoychev, D.. (2017). Nano-indentation investigations of the mechanical properties of thin tio2, wo3 and their composites layers, deposited by spray pyrolysis. in Materiali in Tehnologije
Institute of Metals and Technology., 51(1), 75-83.
https://doi.org/10.17222/mit.2015.216

Cherneva S, Iankov R, Radić N, Grbić B, Datcheva M, Stoychev D. Nano-indentation investigations of the mechanical properties of thin tio2, wo3 and their composites layers, deposited by spray pyrolysis. in Materiali in Tehnologije. 2017;51(1):75-83.
doi:10.17222/mit.2015.216 .

Cherneva, Sabina, Iankov, ROumen, Radić, Nenad, Grbić, Boško, Datcheva, Maria, Stoychev, Dimitar, "Nano-indentation investigations of the mechanical properties of thin tio2, wo3 and their composites layers, deposited by spray pyrolysis" in Materiali in Tehnologije, 51, no. 1 (2017):75-83,
https://doi.org/10.17222/mit.2015.216 . .

TY  - JOUR
AU  - Cherneva, Sabina
AU  - Iankov, Roumen
AU  - Radić, Nenad
AU  - Grbić, Boško
AU  - Stoychev, Dimitar
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1521
AB  - Thin ZrO2, ZrO2-Y2O3, Al2O3 and TiO2 films were deposited by spray pyrolysis method on stainless steel DC 404 substrate with thickness 50 mu m. The thicknesses of obtained films varied from 0.50 to 0.64 mu m. The surface morphology and structure of the films were characterized by scanning electron microscopy in secondary electron imaging mode. The X-ray diffraction measurements for determination of the lattice parameters, the average crystallite size and the sample strain were performed. Mechanical properties of investigated films and substrate were investigated by nanoindentation experiments, using Nano Indenter G200 (Agilent Technologies). As a result of nanoindentation experiments, load-displacement curves were obtained and two mechanical characteristics of the substrate and investigated films - indentation hardness (H-IT) and indentation modulus (E-IT) - were calculated using Oliver & Pharr approximation method. Dependence of indentation modulus and indentation hardness on depth of indentation was investigated as well. 2013 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Materials Science and Engineering B-Advanced Functional Solid-State Materials
T1  - Nanoindentation investigation of mechanical properties of ZrO2, ZrO2-Y2O3, Al2O3 and TiO2 thin films deposited on stainless steel OC 4O4 substrate by spray pyrolysis
VL  - 183
SP  - 12
EP  - 16
DO  - 10.1016/j.mseb.2013.12.006
ER  - 

@article{
author = "Cherneva, Sabina and Iankov, Roumen and Radić, Nenad and Grbić, Boško and Stoychev, Dimitar",
year = "2014",
abstract = "Thin ZrO2, ZrO2-Y2O3, Al2O3 and TiO2 films were deposited by spray pyrolysis method on stainless steel DC 404 substrate with thickness 50 mu m. The thicknesses of obtained films varied from 0.50 to 0.64 mu m. The surface morphology and structure of the films were characterized by scanning electron microscopy in secondary electron imaging mode. The X-ray diffraction measurements for determination of the lattice parameters, the average crystallite size and the sample strain were performed. Mechanical properties of investigated films and substrate were investigated by nanoindentation experiments, using Nano Indenter G200 (Agilent Technologies). As a result of nanoindentation experiments, load-displacement curves were obtained and two mechanical characteristics of the substrate and investigated films - indentation hardness (H-IT) and indentation modulus (E-IT) - were calculated using Oliver & Pharr approximation method. Dependence of indentation modulus and indentation hardness on depth of indentation was investigated as well. 2013 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Materials Science and Engineering B-Advanced Functional Solid-State Materials",
title = "Nanoindentation investigation of mechanical properties of ZrO2, ZrO2-Y2O3, Al2O3 and TiO2 thin films deposited on stainless steel OC 4O4 substrate by spray pyrolysis",
volume = "183",
pages = "12-16",
doi = "10.1016/j.mseb.2013.12.006"
}

Cherneva, S., Iankov, R., Radić, N., Grbić, B.,& Stoychev, D.. (2014). Nanoindentation investigation of mechanical properties of ZrO2, ZrO2-Y2O3, Al2O3 and TiO2 thin films deposited on stainless steel OC 4O4 substrate by spray pyrolysis. in Materials Science and Engineering B-Advanced Functional Solid-State Materials
Elsevier., 183, 12-16.
https://doi.org/10.1016/j.mseb.2013.12.006

Cherneva S, Iankov R, Radić N, Grbić B, Stoychev D. Nanoindentation investigation of mechanical properties of ZrO2, ZrO2-Y2O3, Al2O3 and TiO2 thin films deposited on stainless steel OC 4O4 substrate by spray pyrolysis. in Materials Science and Engineering B-Advanced Functional Solid-State Materials. 2014;183:12-16.
doi:10.1016/j.mseb.2013.12.006 .

Cherneva, Sabina, Iankov, Roumen, Radić, Nenad, Grbić, Boško, Stoychev, Dimitar, "Nanoindentation investigation of mechanical properties of ZrO2, ZrO2-Y2O3, Al2O3 and TiO2 thin films deposited on stainless steel OC 4O4 substrate by spray pyrolysis" in Materials Science and Engineering B-Advanced Functional Solid-State Materials, 183 (2014):12-16,
https://doi.org/10.1016/j.mseb.2013.12.006 . .