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AssigneeRhodia Chimie
InventorsSylvain Busnot, Pierre Macaudiere
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The composition is based on a samarium sesquisulphide, it exhibits a samarium purity with respect to other rare earth metals of greater than 99% and it comprises at least one alkali metal or alkaline earth metal element, at least a portion of which is included in the crystal lattice of the said sesquisulphide. According to another embodiment, the composition is based on a sesquisulphide of samarium and of at least one rare earth metal which is solely trivalent and it comprises at least one alkali metal or alkaline earth metal element, at least a portion of which is included in the crystal lattice of the said sesquisulphide. According to a third embodiment, the composition exhibits a samarium purity such that the cerium content is less than 1%. The process consists in reacting samarium, trivalent rare earth metal and alkali metal or alkaline earth metal compounds with a gaseous mixture of hydrogen sulphide and of carbon disulphide.
A yellow samarium sesquisulphide, comprising a crystal lattice comprising samarium and rare earth metals different from samarium, the samarium purity being greater than 99% with respect to rare earth metals, and comprising at least one alkali metal or alkaline earth metal element, at least a portion of which being included in the crystal lattice of said sesquisulphide.
A yellow samarium sesquisulphide, comprising a crystal lattice, comprising samarium, one or more solely trivalent rare earth metals, and at least one alkali metal or alkaline earth metal element, at least a portion of said alkali metal or alkaline earth metal element being included in the crystal lattice of said sesquisulphide.
A yellow samarium sesquisulphide, comprising a crystal lattice, comprising cerium and samarium, whose purity is such that the cerium is present in an amount of less than 1%, and further comprising at least one alkali metal or alkaline earth metal element, at least a portion of which being included in the crystal lattice of said sesquisulphide.
Dependencies are inferred from the claim text.