Device for manufacturing a crystalline material from a crucible having non-uniform heat resistance

A device forming crucible for fabrication of crystalline material by directional solidification comprising a bottom and at least one side wall wherein the bottom comprises:

• a first portion presenting a first thermal resistance and a second portion presenting a second thermal resistance that is lower than the first thermal resistance,
• the bottom and said at least one side wall being at least partly formed by a tightly sealed part comprising at least one indentation participating in defining said first and second portions,
• wherein the first portion is covered by a first anti-adherent layer having a first face in contact with the bottom of the crucible and a second face designed to be in contact with the crystalline material, the first anti-adherent layer having an additional first thermal resistance measured between said first and second faces, and
• wherein the second portion is covered by a second anti-adherent layer having a first face in contact with the bottom of the crucible and a second face designed to be in contact with the crystalline material, the second anti-adherent layer having an additional second thermal resistance that is lower than the first thermal resistance and measured between said first and second faces.