Abstract
IN a recent communication1 we referred to our work on the measurement of the thermionic emission from mixtures of alkaline earth oxides (BaO, SrO and CaO). The accompanying diagram shows the variation of pulsed emission (amp. cm.−2 at 1,000° K.) with molecular composition which we have found. As can be seen, there appears to be a large central area in which the emission is greater than the maximum obtained from any barium/strontium mixture. A maximum of about 8.0 amp. cm.−2 occurs at BaO : SrO : CaO : : 47 : 43 : 10, the emission falling away sharply with any variation of composition greater than 2 per cent. This value has been obtained from oxides prepared from either mixed or co-precipitated carbonates and can be repeated to within ± 10 per cent. Violet and Reithmuller2 have also found a similar variation of emission in the neighbourhood of this composition. In all, about a hundred different compositions have been studied, in many cases from both mixed and co-precipitated carbonates.
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References
Grey, L. E., Nature, 165, 773 (1950).
Violet, F., and Reithmuller, J., Ann. Radioelect., 4, 184 (1949).
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GREY, L. Pulsed Emission from the BaO–SrO–CaO System. Nature 167, 522 (1951). https://doi.org/10.1038/167522a0
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DOI: https://doi.org/10.1038/167522a0
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