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Photochromic and/or cathodochromic sodalite material, method of its preparation, and sensing element of a variable light transmission device manufactured from such material

  • US 4,490,286 A
  • Filed: 12/14/1981
  • Issued: 12/25/1984
  • Est. Priority Date: 04/15/1980
  • Status: Expired due to Fees
First Claim
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1. A method of preparing a photochromic and/or cathodochromic material of the sodalite series comprised of a homogeneous polycrystalline monolith having a density of at least about 99% of the theoretical density of sodalite of the corresponding chemical composition so that the material is optically transparent and having a temperature of incongruent melting, said method comprising the step of:

  • molding a halogen-containing sodalite powder at a temperature of at least about 800°

    C. but less than the temperature of incongruent melting and a pressure of from about 50 MPa to about 300 MPa for a time sufficient for the density of the material being molded to reach said density of at least about 99% of the theoretical density of sodalite.

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