Flash sintering with concurrent crystallization of Li1.5Al0.5Ge1.5(PO4)3 glass

Author(s)

Campos, Joao, V ; Lavagnini, Isabela R. ; Zallocco, Vinicius M. ; Ferreira, Eduardo B. ; Pallone, Eliria M. J. A. ; Rodrigues, Ana C. M.

• Document type: Journal article
• Source: ACTA MATERIALIA; v. 244, p. 10-pg., 2023-01-01.

Abstract

Single-phase Li1.5Al0.5Ge1.5(PO4)3 NaSICON (Na superionic conductor) glass-ceramic is obtained via a new route using flash-sinter crystallization. Green compacts of glass powder are sinter-crystallized in a few seconds. The results suggest that controlling the current increase during the flash event is needed to avoid overheating, which could cause the melting of the samples. A processing map for the flash sinter-crystallization of Li1.5Al0.5-Ge1.5(PO4)3 is developed and presented based on the current density and holding time at the steady state. The samples fabricated by flash sinter-crystallization are compared with those conventionally heated. Using this novel technique, single-phase glass-ceramics are obtained with total ionic conductivity at room temperature surpassing that of glass-ceramics prepared by conventional heating (2.26 10-4 S cm-1 and 1.36 10-4 S cm- 1, respectively). (AU)

• FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
• Grantee: Edgar Dutra Zanotto
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 19/14677-9 - Influence of the Multi Step Flash Sintering technique on the microstructural control of ZrO2
• Grantee: Eliria Maria de Jesus Agnolon Pallone
• Support Opportunities: Regular Research Grants
• FAPESP's process: 21/06509-9 - Ionic conductor glass-ceramics sintering with concurrent crystallisation using flash sintering
• Grantee: João Vitor Campos
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 21/12412-8 - Contribution to the study of ionic conduction mechanisms in glasses
• Grantee: Vinicius Martins Zallocco
• Support Opportunities: Scholarships in Brazil - Doctorate