NOVELTY - The crucible for melting and crystallizing a metal, a semiconductor material or a metal alloy such as silicon in a polycrystalline block, comprises a crucible base body having a crucible wall, which is completely made of a crucible material. The crucible wall is formed in a crucible base of the base body. A crucible side wall of the base body consists of silicon dioxide with unit of 99%. The crucible wall of the base body is section-wisely provided with an inner-side and/or an outer-side coating, and is formed with joined wall components. An inner-side lining is arranged on the crucible wall.    USE - Crucible for melting and crystallizing a metal, a semiconductor material or a metal alloy such as silicon in a polycrystalline block (claimed) to produce solar cells, electronic components and photovoltaic components.    ADVANTAGE - The crucible is capable of rapidly, cost-effectively and efficiently melting and crystallizing the silicon with high purity and improved thermal conductivity thus increasing the productivity of the solar cells with reduced costs.    DETAILED DESCRIPTION - The crucible for melting and crystallizing a metal, a semiconductor material or a metal alloy such as silicon in a polycrystalline block, comprises a crucible base body having a crucible wall, which is completely made of a crucible material. The crucible wall is formed in a crucible base of the base body. A crucible side wall of the base body consists of silicon dioxide with unit of 99%. The crucible wall of the base body is section-wisely provided with an inner-side and/or an outer-side coating, and is formed with joined wall components. An inner-side lining is arranged on the crucible wall of the base body in a section-wise manner. The crucible wall of the base body is section-wisely formed with property gradients. INDEPENDENT CLAIMS are included for:    (1) a component for a crucible base body of a crucible for melting and crystallizing a metal, a semiconductor material or a metal alloy; and    (2) a method for producing a component for a crucible base of a crucible for melting and crystallizing a metal, a semiconductor material or a metal alloy.