NOVELTY - A laminated crucible contains inner layer silica layer consists of inner layer stucco layer inside the casting mold combined with 50-300 micrometers fine fused silica sand by silica, and silicon nitride coating layer consists of mixed substrate layer of 75-90 wt.% 0.2-4 mu m silicon-nitride powder, 10-6000 ppm sodium-containing silica, and outermost surface which contains barium hydroxide or barium carbonate with average particle diameter of 0.01-0.1 mu m.    USE - Laminated crucible for dissolving and casting silicon raw material to manufacture silicon ingot (claimed) used in manufacture of solar cells.    ADVANTAGE - Oxygen concentration in silicon ingot is reduced, and photoelectric conversion efficiency is improved.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacturing method of laminated crucible for silicon ingot casting which involves applying or spraying a slurry consists of fused silica powder and colloidal silica which contains 10-6000 ppm sodium inside the casting mold to form a slurry bed, spreading 50-300 mu m fine fused silica sand on the surface of the slurry bed, forming inner layer stucco layer on the fine fused silica sand, applying or spraying silicon nitride slurry obtained by mixing 0.2-4 mu m silicon nitride powder with colloidal silica which contains 10-6000 ppm sodium to form mixed substrate layer on the inner layer stucco layer, drying, baking, repeating the process of inner layer stucco layer formation, and mixed substrate layer formation, and forming the mixed substrate layer of outermost surface using barium-containing silicon nitride slurry obtained by mixing barium hydroxide powder or barium carbonate powder with an average particle diameter of 0.01-0.1 mu m with silicon nitride slurry.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional schematic diagram (a), and expanded cross-section of a part of laminated crucible for silicon ingot casting (b).    Laminated crucible for silicon ingot casting (1)    Casting mold (2)    Inner layer silica layer (3)    Silicon nitride coating layer (4)    Silica substrate (5)    Barium-containing compound (6)    Inner layer stucco layer (30)    Fine fused silica sand (31)    Mixed substrate layer (40)    Barium-containing mixed substrate layer (40')    Silicon nitride powder (41)