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Potassium Beams from Solid State Electrochemical Cells

Published online by Cambridge University Press:  25 February 2011

P.G. Bruce ,
S. Roy ,
H. Stewart  and
K. A. Prior
P.G. Bruce
Affiliation:
Centre for Electrochemical and Materials Sciences (CEMS), Department of Chemistry, University of St Andrews, St Andrews, Fife, KY16 9ST, Scotland
S. Roy
Affiliation:
Centre for Electrochemical and Materials Sciences (CEMS), Department of Chemistry, University of St Andrews, St Andrews, Fife, KY16 9ST, Scotland
H. Stewart
Affiliation:
Department of Physics, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, Scotland
K. A. Prior
Affiliation:
Department of Physics, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, Scotland
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Abstract

A solid state electrochemical cell, K1-xFe11O17/potassium beta-alumina/metal gauze, is presented which is capable of producing a beam of potassium vapour. The generation of potassium vapour has been demonstrated and the cell has been used to dope ZnSe during growth of the chalcogenide by molecular beam epitaxy, thus forming p-type ZnSe. The electrochemical source has the advantage that the potassium flux is controlled by the current passing through the cell and eliminates the need to handle potassium metal. Cyclic voltammetric measurements at 350'C suggest that potassium metal is first generated electrochemically by a mechanism of nucleation and growth, then evaporates from the cell.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 293: Symposium U – Solid State Ionics III , 1992 , 93
Copyright
Copyright © Materials Research Society 1993

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References

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