Silica glass crucible

A silica glass crucible, comprising:

• a wall including a bottom wall and a side wall;
• an homogeneously aluminum-doped layer formed on the inner portion of said wall;
• wherein said layer has a depth in the range of 0.2-0.5 mm and is doped with aluminum in the range of about 50-500 ppm.

A method for making a silica glass crucible, comprising:

• introducing into a rotating crucible mold bulk silica grain consisting essentially of pure silica grain to form a bulk grain wall having a bottom wall and a side wall;
• heating the interior of the mold;
• introducing into said mold inner silica grain doped with aluminum, wherein the heat fuses said bulk silica grain and at least partially melts said inner silica grain and fuses said at least partially molten inner silica grain to the bulk grain wall to form a homogeneously aluminum-doped inner layer.

A silica glass crucible comprising:

• a wall including a bottom wall and a side wall;
• and
• a layer non-homogeneously doped with aluminum formed on an inner portion of said wall to promote crystallization of silica.

A method for making a silica glass crucible, comprising:

• introducing into a rotating crucible mold bulk silica grain to form a bulk grain wall having a bottom wall and a side wall, said bulk silica grain consisting essentially of pure silica grain;
• heating the interior of the mold;
• introducing into said mold a non-homogeneous combination of silica grain containing aluminum, wherein the heat fuses said bulk silica grain and wherein the heat at least partially melts said non-homogeneous silica grain and fuses said at least partially molten non-homogeneous silica grain to the wall to form an inner layer.