The impact of heat-treatment protocol on the grain size and ionic conductivity of NASICON glass-ceramics |
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| Affiliation: | 1. Institut für Physikalische Chemie, WWU Münster, Corrensstraße 30, D48149 Münster, Germany;2. Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, CP 676, 13565-905, São Carlos, SP, Brazil;3. Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, São Carlos SP 13566-590, SP. Brazil |
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| Abstract: | 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. |
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| Keywords: | Grain size effect Brick layer model NASICON Glass-ceramics Grain boundary conductivity |
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