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Effect of Aliovalent Cation Doping on the Electrical Conductivity of Na2SO4: Role of Charge and Size of the Dopant

✍ Scribed by A. Singhvi; S. Gomathy; P. Gopalan; A.R. Kulkarni

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
359 KB
Volume
138
Category
Article
ISSN
0022-4596

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✦ Synopsis

A systematic study of the effect of size of the dopant and vacancy concentration on the electrical conductivity of Na 2 SO 4 is reported. The enhancement of conductivity, most pronounced with trivalent cation doping, and maximized for 4 m/o Sm 2 (SO 4 ) 3 , is more than three orders of magnitude at 200°°C. The enhancement of conductivity depends on the extent of solid solubility, formation of intermediate compounds, and extent of vacancy-ion interaction. The size of the dopant influences the conductivity significantly. The effect of doping several cations simultaneously in Na 2 SO 4 is also investigated.

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