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Nano-indentation investigations of the mechanical properties of thin tio2, wo3 and their composites layers, deposited by spray pyrolysis

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2017
2182.pdf (843.4Kb)
Authors
Cherneva, Sabina
Iankov, ROumen
Radić, Nenad
Grbić, Boško
Datcheva, Maria
Stoychev, Dimitar
Article (Published version)
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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.

Keywords:
inorganic compounds / chemical synthesis / electron microscopy / elastic properties
Source:
Materiali in Tehnologije, 2017, 51, 1, 75-83
Publisher:
  • Institute of Metals and Technology
Funding / projects:
  • National Science Fund of Bulgaria - T 02-22
  • National Science Fund of Bulgaria - DNTS/Germany 01/6
  • The development of efficient chemical-engineering processes based on the transport phenomena research and process intensification principles (RS-172022)

DOI: 10.17222/mit.2015.216

ISSN: 1580-2949

WoS: 000396592900013

Scopus: 2-s2.0-85025594652
[ Google Scholar ]
3
3
URI
https://cer.ihtm.bg.ac.rs/handle/123456789/2184
Collections
  • Radovi istraživača / Researchers' publications
Institution/Community
IHTM
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
UR  - Conv_3690
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",
url = "Conv_3690"
}
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
Conv_3690
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
Conv_3690 .
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 .,
Conv_3690 .

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