Basic microstructural, mechanical, electrical and optical characterisation of BaTiAl6O12 ceramics
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Date
2024-06-27
Authors
Drdlík, Daniel
Mařák, Vojtěch
Klement, Róbert
Tofel, Pavel
Drdlíková, Katarina
Hadraba, Hynek
Chlup, Zdeněk
0000-0003-4545-7779Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
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Abstract
In progressive particle or layered composites based on a combination of BaTiO3 and Al2O3, serving as e.g. ceramic harvesters, new phases are formed during heat treatment. The dominant one is BaTiAl6O12. This study provides information about the microstructural, mechanical and optical properties of the BaTiAl6O12 ceramics. The evolution of the phases during the solid-state reaction synthesis of the BaTiAl6O12 was monitored. The fully dense samples prepared by Spark Plasma Sintering had indentation Vickers hardness and indentation elastic modulus within ranges of 10.1 – 13.7 GPa and 132.0 – 187.0 GPa, depending on loading force. The three-point bending tests of the BaTiAl6O12 samples resulted in flexural strength of 129.9 MPa and fracture toughness of 1.8 MPa.m1/2.The sample showed blue broad-band emission under UV excitation due to the charge-transfer transition of the Ti4+ and defect sites. The BaTiAl6O12 evinced low permittivity (') = 16 and dielectric loss (tan ) < 0.0003 at a frequency 1 kHz.
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Citation
BOLETIN DE LA SOCIEDAD ESPANOLA DE CERAMICA Y VIDRIO. 2024, vol. 63, issue 5, p. 368-376.
https://www.sciencedirect.com/science/article/pii/S0366317524000189
https://www.sciencedirect.com/science/article/pii/S0366317524000189
Document type
Peer-reviewed
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Published version
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en