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Growth of Large Quartz Crystals

Abstract

DURING recent years there has been considerable interest both in Europe and the United States in the synthesis of quartz crystals large enough for use as piezo-electric oscillators in telecommunication equipment. An isothermal process for growing such crystals was described by Nora and W. A. Wooster1 in 1946 and a similar method was developed independently in Germany during the Second World War by Nacken2. The isothermal process depends on the high solubility of silica glass relative to that of α-quartz under hydrothermal conditions. In our most successful experiments we were able to deposit a total of nearly 1 mm. of good-quality quartz on to a seed crystal, cut parallel to a rhombohedral face, in an 18-hr, growth-cycle. However, difficulties were incurred in attempting to prolong the growth-cycle beyond a day, due to the devitrification of the silica glass3. We therefore re-examined alternative methods employing a temperature gradient, such as Spezia4 used in his pioneer experiments.

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References

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BROWN, C., KELL, R., THOMAS, L. et al. Growth of Large Quartz Crystals. Nature 167, 940–941 (1951). https://doi.org/10.1038/167940a0

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