TY  - JOUR
AU  - Corlett, Cole A.
AU  - Obradović, Nina
AU  - Watts, Jeremy L.
AU  - Bohannan, Eric W.
AU  - Fahrenholtz, William G.
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/14708
AB  - The synthesis, densification behavior, and crystallographic site occupancy were investigated for four different spinel-based ceramics, including a high-entropy spinel (Co0.2Cu0.2Mg0.2Ni0.2 Zn0.2)Al2O4. Each composition was reacted to form a single phase, but analysis of X-ray diffraction patterns revealed differences in cation site occupancy with the high-entropy spinel being nearly fully normal. Densification behavior was investigated and showed that fully dense ceramics could be produced by hot pressing at temperatures as low as 1375°C for all compositions. Vickers’ hardness values were at least 10 GPa for all compositions. The cations present in the high-entropy spinel appear to have a stabilizing effect that led to nearly normal site occupancy compared to full cation inversion behavior of nickel aluminate spinel. This is the first report that compares cation site occupancy of a high-entropy spinel to conventional spinel ceramics.
PB  - Informa UK Limited
T2  - Journal of Asian Ceramic Societies
T1  - Synthesis, densification, and cation inversion in high entropy (Co,Cu,Mg,Ni,Zn)Al2O4 spinel
SP  - 1
SP  - 330
EP  - 8
EP  - 337
VL  - 11
IS  - 3
DO  - 10.1080/21870764.2023.2227535
UR  - https://hdl.handle.net/21.15107/rcub_dais_14708
ER  - 

@article{
author = "Corlett, Cole A. and Obradović, Nina and Watts, Jeremy L. and Bohannan, Eric W. and Fahrenholtz, William G.",
year = "2023",
abstract = "The synthesis, densification behavior, and crystallographic site occupancy were investigated for four different spinel-based ceramics, including a high-entropy spinel (Co0.2Cu0.2Mg0.2Ni0.2 Zn0.2)Al2O4. Each composition was reacted to form a single phase, but analysis of X-ray diffraction patterns revealed differences in cation site occupancy with the high-entropy spinel being nearly fully normal. Densification behavior was investigated and showed that fully dense ceramics could be produced by hot pressing at temperatures as low as 1375°C for all compositions. Vickers’ hardness values were at least 10 GPa for all compositions. The cations present in the high-entropy spinel appear to have a stabilizing effect that led to nearly normal site occupancy compared to full cation inversion behavior of nickel aluminate spinel. This is the first report that compares cation site occupancy of a high-entropy spinel to conventional spinel ceramics.",
publisher = "Informa UK Limited",
journal = "Journal of Asian Ceramic Societies",
title = "Synthesis, densification, and cation inversion in high entropy (Co,Cu,Mg,Ni,Zn)Al2O4 spinel",
pages = "1-330-8-337",
volume = "11",
number = "3",
doi = "10.1080/21870764.2023.2227535",
url = "https://hdl.handle.net/21.15107/rcub_dais_14708"
}

Corlett, C. A., Obradović, N., Watts, J. L., Bohannan, E. W.,& Fahrenholtz, W. G.. (2023). Synthesis, densification, and cation inversion in high entropy (Co,Cu,Mg,Ni,Zn)Al2O4 spinel. in Journal of Asian Ceramic Societies
Informa UK Limited., 11(3), 1-8.
https://doi.org/10.1080/21870764.2023.2227535
https://hdl.handle.net/21.15107/rcub_dais_14708

Corlett CA, Obradović N, Watts JL, Bohannan EW, Fahrenholtz WG. Synthesis, densification, and cation inversion in high entropy (Co,Cu,Mg,Ni,Zn)Al2O4 spinel. in Journal of Asian Ceramic Societies. 2023;11(3):1-8.
doi:10.1080/21870764.2023.2227535
https://hdl.handle.net/21.15107/rcub_dais_14708 .

Corlett, Cole A., Obradović, Nina, Watts, Jeremy L., Bohannan, Eric W., Fahrenholtz, William G., "Synthesis, densification, and cation inversion in high entropy (Co,Cu,Mg,Ni,Zn)Al2O4 spinel" in Journal of Asian Ceramic Societies, 11, no. 3 (2023):1-8,
https://doi.org/10.1080/21870764.2023.2227535 .,
https://hdl.handle.net/21.15107/rcub_dais_14708 .

TY  - CONF
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Bohannan, Eric W.
AU  - Fahrenholtz, William G.
PY  - 2023
UR  - https://dais.sanu.ac.rs/123456789/16212
AB  - Mixtures of ZrO2 and C were prepared by high-energy ball milling. Powders were milled for times from 0 to 120 minutes in air atmosphere. As milling time increased, surface area of powders increased, indicating significant particle size reduction. The thermal treatment cycle included heating at 10 °C/min to 1600 °C followed by an isothermal hold for 2 hours under the vacuum (~20 Pa) in a resistance-heated graphite element furnace. This first step of the process promoted carbothermal reaction of the starting materials.
DSC-TGA was used to follow the carbothermal reaction. The onset temperature does not seem to change for non-activated and activated powders. The change in peak area may be related to the amount of the powder that reacts at this temperature. The catbothermal reaction was split into two parts for powders activated 60 and 120 minutes. Only part of the powder reacts at the initial
reaction, and then higher temperatures are required for full reaction.
PB  - Brno : Central and Eastern European Committee for Thermal Analysis and Calorimetry (CEEC-TAC)
C3  - Book of abstracts of the 7th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC7)
T1  - Carbothermal reaction of mechanically activated ZrC powders followed by DSC-TGA
SP  - 137
EP  - 137
UR  - https://hdl.handle.net/21.15107/rcub_dais_16212
ER  - 

@conference{
author = "Obradović, Nina and Filipović, Suzana and Bohannan, Eric W. and Fahrenholtz, William G.",
year = "2023",
abstract = "Mixtures of ZrO2 and C were prepared by high-energy ball milling. Powders were milled for times from 0 to 120 minutes in air atmosphere. As milling time increased, surface area of powders increased, indicating significant particle size reduction. The thermal treatment cycle included heating at 10 °C/min to 1600 °C followed by an isothermal hold for 2 hours under the vacuum (~20 Pa) in a resistance-heated graphite element furnace. This first step of the process promoted carbothermal reaction of the starting materials.
DSC-TGA was used to follow the carbothermal reaction. The onset temperature does not seem to change for non-activated and activated powders. The change in peak area may be related to the amount of the powder that reacts at this temperature. The catbothermal reaction was split into two parts for powders activated 60 and 120 minutes. Only part of the powder reacts at the initial
reaction, and then higher temperatures are required for full reaction.",
publisher = "Brno : Central and Eastern European Committee for Thermal Analysis and Calorimetry (CEEC-TAC)",
journal = "Book of abstracts of the 7th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC7)",
title = "Carbothermal reaction of mechanically activated ZrC powders followed by DSC-TGA",
pages = "137-137",
url = "https://hdl.handle.net/21.15107/rcub_dais_16212"
}

Obradović, N., Filipović, S., Bohannan, E. W.,& Fahrenholtz, W. G.. (2023). Carbothermal reaction of mechanically activated ZrC powders followed by DSC-TGA. in Book of abstracts of the 7th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC7)
Brno : Central and Eastern European Committee for Thermal Analysis and Calorimetry (CEEC-TAC)., 137-137.
https://hdl.handle.net/21.15107/rcub_dais_16212

Obradović N, Filipović S, Bohannan EW, Fahrenholtz WG. Carbothermal reaction of mechanically activated ZrC powders followed by DSC-TGA. in Book of abstracts of the 7th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC7). 2023;:137-137.
https://hdl.handle.net/21.15107/rcub_dais_16212 .

Obradović, Nina, Filipović, Suzana, Bohannan, Eric W., Fahrenholtz, William G., "Carbothermal reaction of mechanically activated ZrC powders followed by DSC-TGA" in Book of abstracts of the 7th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC7) (2023):137-137,
https://hdl.handle.net/21.15107/rcub_dais_16212 .