Ionic Conductivity of Na2SO4–Al2O3 Composite Electrolytes: Mechanism and the Role of the Preparatory Parameters

✍ Scribed by Ashish Jain; Sandeep Saha; Prakash Gopalan; Ajit Kulkarni

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 180 KB
• Volume: 153
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.8764

✦ Synopsis

A moderate increase in the electrical conductivity of sodium sulfate has been obtained by dispersing alumina particles. The largest enhancement in conductivity for furnace-cooled samples is observed for 5.5 and 35 m/o -Al 2 O 3 compositions. For 35 m/o composition, the conductivity increases by more than 1 order of magnitude at 4003C and 2 orders of magnitude at 2003C. In contrast to the understanding based on many composite electrolyte theories, 0.004 m alumina brings about the same or even lower enhancement in conductivity as 0.5 m alumina. Furthermore, contrary to expectations, negligible enhancement is observed when -Al 2 O 3 is employed. The maximum enhancement in this study is observed for the 4 m/o Al 2 O 3 quenched sample: the conductivity increases by 2 orders for the high-temperature phase and by more than 3 orders for the low-temperature phase. 2000 Academic Press