C03B19/095

QUARTZ GLASS CRUCIBLE CAPABLE OF MEASURING INFRARED TRANSMITTANCE

A quartz glass crucible 1 having a cylindrical side wall portion 10a, a bottom portion 10b, and a corner portion 10c connecting the side wall portion 10a and the bottom portion 10b to each other includes a transparent layer 11 made of quartz glass that does not contain bubbles, a bubble layer 12 formed outside the transparent layer 11 and made of quartz glass containing a large number of bubbles, and a semi-molten layer 13 formed outside the bubble layer 12 and made of raw material silica powder solidified in a semi-molten state, wherein at least one semi-molten layer-removed portion 13X is formed as a recessed region from which a portion of the semi-molten layer 13 has been removed toward an inner side of the quartz glass crucible 1.