Cathodochromic sodalite
AssigneeU.S. Philips Corporation
InventorRoelof Egbert Schuil
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Abstract
A cathodochromic sodalite defined by the formula Na.sub.3 Al.sub.3 Si.sub.3 O.sub.12.NaX (X = Cl, Br or J) comprising at least one of the elements tin, lead and germanium in a quantity of between 0.05 and 2 atom % calculated with respect to silicon. The addition of the said elements results in an improvement of the reversible bleaching properties. Notably, a faster and also a more complete bleaching is obtained.
Claims7
A cathodochromic sodalite defined by the formula Na.sub.3 Al.sub.3 Si.sub.3 O.sub.12.NaX in which X represents at least one halogen selected from the group consisting of chlorine, bromine and iodine, wherein the sodalite contains at least one element selected from the group consisting of tin, lead and germanium in a quantity of between 0.05 and 2 atom % calculated with respect to silicon.
Dependencies are inferred from the claim text.