Process for preparing cathodochromic sodalite

Details Process for preparing cathodochromic sodalite Process for preparing cathodochromic sodalite

1974-04-01

1976-01-13

Meros, Edward J.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423329, 423330, 2523014F, C01B 3326, C01B 3328, C09K 1108

Patent

active

039325920

ABSTRACT:
A process for preparing cathodochromic materials whereby coloration properties of the materials are enhanced by a low-temperature re-crystallization process. Crystalline powders formed using either hydrothermal or sintering growth techniques are hydrothermally re-crystallized at a temperature sufficiently high and for a time sufficiently long to effect re-crystallization. The temperature range for hydrothermal re-crystallization is 60.degree.C to 300.degree.C and the re-crystallization growth time is at least the order of 12 hours and, more typically, the order of three days. There is shown a cathode ray tube employing said materials.

REFERENCES:
patent: 2761846 (1956-09-01), Medved
patent: 3705323 (1972-12-01), Shidlovsky
patent: 3760063 (1973-09-01), Dreyfus
patent: 3773540 (1970-11-01), Shidlovsky
williams et al. "J. American Ceramic Society" Vol. 52, No. 3, 1969, pp. 139-145.
Todd "Investigation of the Properties of Cathodochromic Sodalite and Cathodochromic CRT Display Devices" Feb. 1974, M.I.T., Feb. 1974, pp. 38-41.

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