TY  - JOUR
AU  - Romčević, Nebojša Ž.
AU  - Gilić, Martina D.
AU  - Anzel, I.
AU  - Rudolf, R.
AU  - Mitrić, Miodrag
AU  - Romčević, Maja J.
AU  - Hadžić, Branka B.
AU  - Joksimović, Danijela
AU  - Damjanovic, M. Petrovic
AU  - Kos, M.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5968
AB  - Our work deals with the problem of producing a complex metal-ceramic composite using the processes of internal oxidation (IO) and severe plastic deformation. For this purpose, Cu-Al alloy with 0.4wt.% of Al was used. IO of sample serves in the first step of the processing as a means for attaining a fine dispersion of nanosized oxide particles in the metal matrix. Production technology continues with repeated application of severe plastic deformation (SPD) of the resulting metal-matrix composite to produce the bulk nanoscaled structural material. SPD was carried out with equal channel angular pressing (ECAP), which allowed that the material could be subjected to an intense plastic strain through simple shear. Microstructural characteristics of one phase and multiphase material was studied on internally oxidized Cu with 0.4wt.% of Al sample composed of one phase copper-aluminum solid solution in the core and fine dispersed oxide particles in the same matrix in the mantle region. In this manner AFM, X-ray diffraction and Raman spectroscopy were used. Local structures in plastically deformed samples reflect presence of Cu, CuO, Cu2O, Cu4O3 or Al2O3 structural characteristics, depending on type of sample.
T2  - Journal of mining and metallurgy, Section B: Metallurgy
T1  - Determination of Microstructural Changes By Severely Plastically Deformed Copper-Aluminum Alloy: Optical Study
VL  - 50
IS  - 1
SP  - 61
EP  - 68
DO  - 10.2298/JMMB140121007R
ER  - 

@article{
author = "Romčević, Nebojša Ž. and Gilić, Martina D. and Anzel, I. and Rudolf, R. and Mitrić, Miodrag and Romčević, Maja J. and Hadžić, Branka B. and Joksimović, Danijela and Damjanovic, M. Petrovic and Kos, M.",
year = "2014",
abstract = "Our work deals with the problem of producing a complex metal-ceramic composite using the processes of internal oxidation (IO) and severe plastic deformation. For this purpose, Cu-Al alloy with 0.4wt.% of Al was used. IO of sample serves in the first step of the processing as a means for attaining a fine dispersion of nanosized oxide particles in the metal matrix. Production technology continues with repeated application of severe plastic deformation (SPD) of the resulting metal-matrix composite to produce the bulk nanoscaled structural material. SPD was carried out with equal channel angular pressing (ECAP), which allowed that the material could be subjected to an intense plastic strain through simple shear. Microstructural characteristics of one phase and multiphase material was studied on internally oxidized Cu with 0.4wt.% of Al sample composed of one phase copper-aluminum solid solution in the core and fine dispersed oxide particles in the same matrix in the mantle region. In this manner AFM, X-ray diffraction and Raman spectroscopy were used. Local structures in plastically deformed samples reflect presence of Cu, CuO, Cu2O, Cu4O3 or Al2O3 structural characteristics, depending on type of sample.",
journal = "Journal of mining and metallurgy, Section B: Metallurgy",
title = "Determination of Microstructural Changes By Severely Plastically Deformed Copper-Aluminum Alloy: Optical Study",
volume = "50",
number = "1",
pages = "61-68",
doi = "10.2298/JMMB140121007R"
}

Romčević, N. Ž., Gilić, M. D., Anzel, I., Rudolf, R., Mitrić, M., Romčević, M. J., Hadžić, B. B., Joksimović, D., Damjanovic, M. P.,& Kos, M.. (2014). Determination of Microstructural Changes By Severely Plastically Deformed Copper-Aluminum Alloy: Optical Study. in Journal of mining and metallurgy, Section B: Metallurgy, 50(1), 61-68.
https://doi.org/10.2298/JMMB140121007R

Romčević NŽ, Gilić MD, Anzel I, Rudolf R, Mitrić M, Romčević MJ, Hadžić BB, Joksimović D, Damjanovic MP, Kos M. Determination of Microstructural Changes By Severely Plastically Deformed Copper-Aluminum Alloy: Optical Study. in Journal of mining and metallurgy, Section B: Metallurgy. 2014;50(1):61-68.
doi:10.2298/JMMB140121007R .

Romčević, Nebojša Ž., Gilić, Martina D., Anzel, I., Rudolf, R., Mitrić, Miodrag, Romčević, Maja J., Hadžić, Branka B., Joksimović, Danijela, Damjanovic, M. Petrovic, Kos, M., "Determination of Microstructural Changes By Severely Plastically Deformed Copper-Aluminum Alloy: Optical Study" in Journal of mining and metallurgy, Section B: Metallurgy, 50, no. 1 (2014):61-68,
https://doi.org/10.2298/JMMB140121007R . .

TY  - JOUR
AU  - Kostić, Radmila
AU  - Damjanovic, M. Petrovic
AU  - Romčević, Nebojša Ž.
AU  - Romčević, Maja J.
AU  - Stojanović, Dušanka
AU  - Čomor, Mirjana
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4714
AB  - Far-infrared reflectivity spectra, in spectral region 50-600 cm(-1) and temperature region 80-300 K, of CdS and Cd1-xMnxS nanocrystals embedded in hexametaphosphate, are presented. The analysis of the far-infrared experimental reflectivity spectrum was made by the fitting procedure. The Maxwell-Garnet effective medium theory is used for modeling an effective dielectric function as well as to separate respond from nanoparticles. To analyze spectra in CdS omega(TO)(approximate to 238 cm(-1)) to omega(TO)(approximate to 305 cm(-1)) spectral region, quantized dipolar modes in a spherical isotropic material quantum dot (QD) are considered in the framework of a continuum model. As to the mechanical boundary conditions rigid sphere is concerned. Experimental far-infrared reflectivity spectra of our samples are in general agreement with the predictions of this model. Experimentally registered and through fitting procedure located features for CdS nanoparticles in spectral region below CdS omega(TO) at: approximate to 102 cm(-1), approximate to 135 cm(-1), approximate to 170 cm(-1) and approximate to 210 cm(-1) are associated to defect induced modes, especially to defects located near the surface of CdS QD. In region over CdS omega(LO), modes are identified as multiphonons. In Cd1-xMnxS QD spectra new reflectivity peaks are at: approximate to 85 cm(-1), approximate to 110 cm(-1) and approximate to 180 cm(-1) in spectral region below CdS omega(TO), approximate to 270 cm(-1) inside CdS omega(TO)-omega(LO) spectral region and approximate to 356 cm(-1) and approximate to 376 cm(-1) in region over CdS omega(LO). First two registered modes are associated to both mass and force constant defects at the surface, and rest four modes are consequence of MnS phases present in the sample. (C) 2012 Published by Elsevier B.V.
T2  - Journal of Alloys and Compounds
T1  - Far-infrared spectroscopy of Cd1-xMnxS quantum dots
VL  - 521
SP  - 134
EP  - 140
DO  - 10.1016/j.jallcom.2012.01.079
ER  - 

@article{
author = "Kostić, Radmila and Damjanovic, M. Petrovic and Romčević, Nebojša Ž. and Romčević, Maja J. and Stojanović, Dušanka and Čomor, Mirjana",
year = "2012",
abstract = "Far-infrared reflectivity spectra, in spectral region 50-600 cm(-1) and temperature region 80-300 K, of CdS and Cd1-xMnxS nanocrystals embedded in hexametaphosphate, are presented. The analysis of the far-infrared experimental reflectivity spectrum was made by the fitting procedure. The Maxwell-Garnet effective medium theory is used for modeling an effective dielectric function as well as to separate respond from nanoparticles. To analyze spectra in CdS omega(TO)(approximate to 238 cm(-1)) to omega(TO)(approximate to 305 cm(-1)) spectral region, quantized dipolar modes in a spherical isotropic material quantum dot (QD) are considered in the framework of a continuum model. As to the mechanical boundary conditions rigid sphere is concerned. Experimental far-infrared reflectivity spectra of our samples are in general agreement with the predictions of this model. Experimentally registered and through fitting procedure located features for CdS nanoparticles in spectral region below CdS omega(TO) at: approximate to 102 cm(-1), approximate to 135 cm(-1), approximate to 170 cm(-1) and approximate to 210 cm(-1) are associated to defect induced modes, especially to defects located near the surface of CdS QD. In region over CdS omega(LO), modes are identified as multiphonons. In Cd1-xMnxS QD spectra new reflectivity peaks are at: approximate to 85 cm(-1), approximate to 110 cm(-1) and approximate to 180 cm(-1) in spectral region below CdS omega(TO), approximate to 270 cm(-1) inside CdS omega(TO)-omega(LO) spectral region and approximate to 356 cm(-1) and approximate to 376 cm(-1) in region over CdS omega(LO). First two registered modes are associated to both mass and force constant defects at the surface, and rest four modes are consequence of MnS phases present in the sample. (C) 2012 Published by Elsevier B.V.",
journal = "Journal of Alloys and Compounds",
title = "Far-infrared spectroscopy of Cd1-xMnxS quantum dots",
volume = "521",
pages = "134-140",
doi = "10.1016/j.jallcom.2012.01.079"
}

Kostić, R., Damjanovic, M. P., Romčević, N. Ž., Romčević, M. J., Stojanović, D.,& Čomor, M.. (2012). Far-infrared spectroscopy of Cd1-xMnxS quantum dots. in Journal of Alloys and Compounds, 521, 134-140.
https://doi.org/10.1016/j.jallcom.2012.01.079

Kostić R, Damjanovic MP, Romčević NŽ, Romčević MJ, Stojanović D, Čomor M. Far-infrared spectroscopy of Cd1-xMnxS quantum dots. in Journal of Alloys and Compounds. 2012;521:134-140.
doi:10.1016/j.jallcom.2012.01.079 .

Kostić, Radmila, Damjanovic, M. Petrovic, Romčević, Nebojša Ž., Romčević, Maja J., Stojanović, Dušanka, Čomor, Mirjana, "Far-infrared spectroscopy of Cd1-xMnxS quantum dots" in Journal of Alloys and Compounds, 521 (2012):134-140,
https://doi.org/10.1016/j.jallcom.2012.01.079 . .