| http://www.w3.org/ns/prov#value | - Such migration is liable to result from the application of temperatures in excess of 600??? C. Such layers forming a barrier to alkali metals are known, and mention may be made of SiO2, SiOC and SiOxNy layers, with a thickness for example of at least 50 nm, as described in PCT International Application WO 02/24971.
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