Detail publikace

Doping of alumina ceramics by manganese – Thermodynamical and experimental approach

SVOBODA, J. DRDLÍKOVÁ, K. DRDLÍK, D. KROUPA, A. MICHALIČKA, J. MACA, K.

Originální název

Doping of alumina ceramics by manganese – Thermodynamical and experimental approach

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

The preparation of a transparent ultra-fine-grained doped ceramics requires a homogeneous dopant distribution in a matrix. In the present work, two thermodynamical phenomena allowing the preparation of such ceramics (the dissolution of the dopant and the formation of undesirable secondary phases) were experimentally and theoretically studied. A general thermodynamic-kinetic model was developed for dopant dissolution, which was verified for the experimental conditions used in this work. The model and experiment showed that Mn3O4 dopant with overall concentration of 1 at.% and particle size of 50 nm is dissolved and homogenized in a fine-grained alumina matrix within less than one hour at a temperature of 1220 °C. For the purposes of the study of the formation of undesired secondary phase, the phase diagram of the Al2O3-Mn3O4 system was calculated using the CALPHAD approach. Detailed STEM observations combined with EDX and EELS chemical analyses showed that the data used for the calculation of the phase diagram need some modifications because they overestimate the solubility of Mn in the alumina and underestimate the solubility of Mn in the MnAl2O4 spinel.

Klíčová slova

alumina; doping; sintering; electron energy loss spectroscopy (EELS); thermodynamics

Autoři

SVOBODA, J.; DRDLÍKOVÁ, K.; DRDLÍK, D.; KROUPA, A.; MICHALIČKA, J.; MACA, K.

Vydáno

27. 3. 2022

Nakladatel

Faculty of Technology, University of Novi Sad

ISSN

2406-1034

Periodikum

Processing and Application of Ceramics

Ročník

16

Číslo

1

Stát

Srbská republika

Strany od

13

Strany do

21

Strany počet

9

URL

http://www.doiserbia.nb.rs/Article.aspx?ID=1820-61312201013S

Plný text v Digitální knihovně

http://hdl.handle.net/11012/204471

BibTex

@article{BUT177570,
  author="Jiří {Svoboda} and Katarina {Drdlíková} and Daniel {Drdlík} and Aleš {Kroupa} and Jan {Michalička} and Karel {Maca}",
  title="Doping of alumina ceramics by manganese – Thermodynamical and experimental approach",
  journal="Processing and Application of Ceramics",
  year="2022",
  volume="16",
  number="1",
  pages="13--21",
  doi="10.2298/PAC2201013S",
  issn="2406-1034",
  url="http://www.doiserbia.nb.rs/Article.aspx?ID=1820-61312201013S"
}