Samarium sesquioxide

Samarium sesquioxide is used in optical and infrared absorbing glass to absorb infrared radiation. Also, it is used as a neutron absorber in control rods for nuclear power reactors. Tbe oxide catalyzes dehydration of acychc primary alcohols to aldehydes and ketones. Another use involves preparation of other samarium salts. 

Samarium sesquioxide may be prepared by two methods (1) thermal decomposition of samarium carbonate, hydroxide, nitrate, oxalate or sulfate ... 

Samarium sesquioxide dissolves in mineral acids, forming salts upon evaporation and crystallization ... 

Disamarium trioxide EINECS 235-043-6 Samaria Samarium (III) oxide Samarium oxide Samarium oxide (Sm203) Samarium sesquioxide Samarium trioxide Samarium(3 ) oxide Samarium(lll) oxide. Catalyst in the dehydrogenation of ethanol, infrared-absorbing glass, neutron absorber, preparation of samarium salts. Solid d -8.347. Noah Chem. Rhdne-Poulenc. 

CAS 12060-58-1 EINECS/ELINCS 235-043-6 Synonyms Samarium (III) oxide Samarium sesquioxide... 

Self-Diffusion of Oxygen in Neodymium and Samarium Sesquioxide, G.D. Stone, G.R. Weber and L. Eyring, Proceedings of a Conference on Mass Transport in Oxides, pp. 179-186, 1968. 

Leger etal. (1980,1981) have described the preparation, at high pressures, of the metallic monoxides for the elements from lanthanum to samarium and have determined their structure and conductivities. A negative PAV term in the free-energy expression makes it possible to synthesize the monoxides from a mixture of the metal and the sesquioxide under pressure. These monoxides can be maintained at normal pressures after,preparation. The monoxides through NdO are metallic, golden-yellow compounds with the Ln atom being trivalent. SmO is metallic with a valence close to... 

Assuming that the lanthanide and actinide dioxides are truly stoichiometric, a self-consistent and relative set of quadrivalent radii can be calculated from their lattice parameters. These radii are given in table 30. The actinide dioxides are known to have larger lattice parameters than their lanthanide electronic homologs. Thus, PuOj has a parameter similar to that for Ce02, which is four elements to the left of samarium, the vertical 4f homolog of Pu. This is a greater shift than that observed with the sesquioxides (see below). Structurally, the dioxides of the lanthanides and actinides are isostructural, and crystallize in the fluorite-type, cubic (fee) structure. 

The structure and magnetic properties of samarium as the sesquioxide and the metal have been studied by Perakis and Kern (1972). Between 8(1-154 K the magnetic susceptibility of a purified Sm specimen essentially coincided with that for Sm " in monoclinic Sm203. The minimum of x (the magnetic susceptibility) was at about 350 K. 

Pankratz, L.B., E.G. King and K.K. Kelley, 1962, High-Temperature Heat Contents and Entropies of the Sesquioxides of Europium, Gadolinium, Neodymium, Samarium and Yttrium Jn Bur. Mines Ryjort. of Inv. 6033. Panlei( er, R.J., R.N. Blumenthal and J.E. Gamier, 1975, J. Phys. Chem. Solids, 36, 1213. 

Stecura, S., 1965, Crystallographic Modifications and Phase Transformation Rates of Five Rare Earth Sesquioxides Lanthanum Oxide, Neodymium Oxide, Samarium Oxide, Europium Oxide and Gadolinium Oxide, in Bur. of Mines Rept. of Inv. 6616. 

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