A system for forming an ingot from a melt , the system comprising two crucibles: a first crucible defining a cavity for receiving the melt; a second crucible in the cavity, the second crucible separating an outer zone from an inner zone , the second crucible including a passageway therethrough to allow the melt located within the outer zone to move into the inner zone, wherein the inner zone defines a growth area for the ingot; wherein the system does not comprise further crucibles in addition to the first and second crucible; the system further comprising: a barrier located within the outer zone to limit movement of the melt through the outer zone, the barrier including members that are randomly arranged to define a labyrinth for melt flow, wherein the members are free to move, and wherein the members are buoyant such that the solid feedstock material contacts the members prior to melting; provided that the system does not comprise at least one barrier ring adjacent a base of the second crucible , the barrier ring being positioned in a cavity of the first crucible such that the first crucible , the second crucible , and an outer barrier ring form the outer zone therebetween, and in addition forming at least one transition zone , the barrier ring including a second passageway for the melt to flow through from outer zone into transition zone and then into inner zone . a first crucible defining a cavity for receiving the melt; a second crucible in the cavity, the second crucible separating an outer zone from an inner zone , the second crucible including a passageway therethrough to allow the melt located within the outer zone to move into the inner zone, wherein the inner zone defines a growth area for the ingot; wherein the system does not comprise further crucibles in addition to the first and second crucible; the system further comprising: a barrier located within the outer zone to limit movement of the melt through the outer zone, the barrier including members that are randomly arranged to define a labyrinth for melt flow, wherein the members are free to move, and wherein the members are buoyant such that the solid feedstock material contacts the members prior to melting; provided that the system does not comprise at least one barrier ring adjacent a base of the second crucible , the barrier ring being positioned in a cavity of the first crucible such that the first crucible , the second crucible , and an outer barrier ring form the outer zone therebetween, and in addition forming at least one transition zone , the barrier ring including a second passageway for the melt to flow through from outer zone into transition zone and then into inner zone . a barrier located within the outer zone to limit movement of the melt through the outer zone, the barrier including members that are randomly arranged to define a labyrinth for melt flow, wherein the members are free to move, and wherein the members are buoyant such that the solid feedstock material contacts the members prior to melting; provided that the system does not comprise at least one barrier ring adjacent a base of the second crucible , the barrier ring being positioned in a cavity of the first crucible such that the first crucible , the second crucible , and an outer barrier ring form the outer zone therebetween, and in addition forming at least one transition zone , the barrier ring including a second passageway for the melt to flow through from outer zone into transition zone and then into inner zone . <EOS>