公开(公告)号：EP1134200B1

公开(公告)日：2003-08-27

申请号：EP00309332.5

申请日：2000-10-23

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Bahr, Charles C., Jr. ,  Bhandarkar, Suhas ,  Bohrer, Michael P.

IPC: C03C1/00 ,  C03C13/04 ,  C03B19/12 ,  C03B37/012 ,  C03C17/02 ,  C03C3/06

CPC classification number: C03C1/006 ,  C03B19/12 ,  C03B37/016 ,  C03B2201/12 ,  C03C2201/06 ,  C03C2201/12 ,  Y10S65/16 ,  Y10S65/901 ,  Y10S501/90 ,  Y10S501/905

公开(公告)号：EP1134200A1

公开(公告)日：2001-09-19

申请号：EP00309332.5

申请日：2000-10-23

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Bahr, Charles C., Jr. ,  Bhandarkar, Suhas ,  Bohrer, Michael P.

IPC: C03C1/00 ,  C03C13/04 ,  C03B19/12 ,  C03B37/012 ,  C03C17/02 ,  C03C3/06

CPC classification number: C03C1/006 ,  C03B19/12 ,  C03B37/016 ,  C03B2201/12 ,  C03C2201/06 ,  C03C2201/12 ,  Y10S65/16 ,  Y10S65/901 ,  Y10S501/90 ,  Y10S501/905

Abstract: The invention reflects discovery of a liquid phase doping technique that, unlike previous techniques, exhibits very little fluorine depletion upon subsequent heating. The invention involves the steps of providing a silica sol comprising a tetraalkylammonium hydroxide and a di-, tri-, or tetra-alkylammonium fluoride, the sol having pH of about 10 to about 14, adding a gelling agent to the sol to induce gelation, casting or extruding the sol to form a gel body, and then drying, heat treating, and sintering the body. Advantageously, the fluorine-containing compound is tetramethylammonium fluoride.