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http://hdl.handle.net/10773/37368
Title: | Linking sintering stresses to nano modification in the microstructure of BaLa4Ti4O15 by transmission electron microscopy |
Author: | Selvaraj, Nivas Babu Fernandes, Manuela Reaney, Ian M. Abrantes, João C.C. Denneulin, Thibaud Snoeck, Etienne Vilarinho, Paula Maria Senos, Ana Maria |
Keywords: | Stress Sintering Barium lanthanum titanate High resolution transmission electron microscopy Microstructure Geometric phase analysis |
Issue Date: | Aug-2018 |
Publisher: | Elsevier |
Abstract: | igh quality factor and a temperature stable resonant frequency make BaLa4Ti4O15 (BLT) ceramics attractive materials for microwave applications. Aiming to exploit the effects of external stresses on the development of textured and anisotropic microstructures to optimise MW properties, the influence of applied external pressure during sintering of BLT ceramics is analysed. HRTEM and geometric phase analysis (GPA) showed that stresses applied during sintering, trigger the nucleation and growth of faults hypothesised to be due to the errors in the AO3 layer (basal plane) stacking sequence of the hexagonal perovskite structure. The results reveal a strong correlation between the high concentration of structural defects and the development of anisotropic microstructures, which tune the properties of BLT. Stresses applied during sintering are therefore a promising tool to design material properties. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/37368 |
DOI: | 10.1016/j.matchar.2018.04.054 |
ISSN: | 1044-5803 |
Appears in Collections: | CICECO - Artigos DEMaC - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Linking sintering stresses to nano modification in the.pdf | 7.07 MB | Adobe PDF | View/Open |
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