Samarium compounds

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• New text adds divalent halides where previously only trivalent halides were mentioned.
• Sulfide section now describes additional sulfides and polymorphism of Sm2S3.
• Borides section expanded with phase, structural, lattice-parameter, and magnetic-ordering details that are newly present.

Add: Samarium forms both trivalent and divalent binary halides Reaction of the metal with the halogens gives the trihalides X F Cl Br or. Add: Samarium forms several sulfides in addition to SmS The sesquisulfide Sm 2 S 3 containing Sm is polymorphic The A or α modification is orthorhombic with space group Pnma whereas the. Add: Samarium forms several binary borides spanning a wide range of boron content Early phase equilibrium studies of the Sm B system identified a samarium rich phase of approximate composition together with and the boron rich phase The tetraboride and hexaboride have measurable homogeneity ranges and the hardness of the phases generally increases with increasing boron content A further boride has also been structurally characterized is difficult to obtain under ordinary conditions because more boron rich phases are preferentially formed It has been synthesized at high pressure and high temperature and adopts the hexagonal structure type with lattice parameters a 0 3310 nm and c 0 4019 nm crystallizes in the tetragonal structure type It undergoes antiferromagnetic ordering near 25 K with a secon. Add: Samarium hexaboride crystallizes in the cubic structure type in which octahedra form a three dimensional boron framework surrounding the samarium atoms It is an intermediate valence compound the samarium 4f configuration fluctuates between states.

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