The impact of heat-treatment protocol on the grain size and ionic conductivity of NASICON glass-ceramics

Na2AlTi(PO4)3 (NATP) and Na1.8Al0.8Ge1.2(PO4)3 (NAGP) NASICON (Na-Superionic Conductor) glass-ceramics are obtained by applying different single (SHT) and double (DHT) heat treatments on the respective precursor glass to evaluate its effect on the microstructure and in turn, on the total ionic condu...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2020-12, Vol.40 (15), p.5634-5645
Main Authors: Nieto-Muñoz, Adriana M., Ortiz-Mosquera, Jairo F., Rodrigues, Ana C.M.
Format: Article
Language:English
Subjects:
Brick layer model
Glass-ceramics
Grain boundary conductivity
Grain size effect
NASICON
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Summary:Na2AlTi(PO4)3 (NATP) and Na1.8Al0.8Ge1.2(PO4)3 (NAGP) NASICON (Na-Superionic Conductor) glass-ceramics are obtained by applying different single (SHT) and double (DHT) heat treatments on the respective precursor glass to evaluate its effect on the microstructure and in turn, on the total ionic conductivity. The grain and grain boundary contributions are also analyzed in the NATP composition. SHT with longer crystallization times favors the development of well-defined grains in both compositions and also promotes the grain growth in NAGP samples. This behavior causes a decrease in the activation energy of the grain boundary, which enhances the total ionic conductivity. Regarding DHT samples, microstructure with larger grains and higher ionic conductivity were obtained with shorter nucleation times for NATP and NAGP compositions. Finally, the microstructural variation generated by the different thermal treatments causes the total conductivity to increase up to two times.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2020.05.026