Samson phases

An important contribution to the structure analysis of intermetallic phases in terms of the coordination polyhedra has been carried out by Frank and Kasper (1958). They described several structure types (Frank-Kasper structures) as the result of the interpenetration of a group of polyhedra, which give rise to a distorted tetrahedral close-packing of the atoms. Samson (1967, 1969) developed the analysis of the structural principles of intermetallic phases having giant unit cells (Samson phases). These structures have been described as arrangements of fused polyhedra rather than the full interpenetrating polyhedra. 

Platzman (1962a) has emphasized the implications of superexcited states in radiation chemistry. On the whole, his conjectures have been proved correct. Figure 4.2, using the data of Haddad and Samson (1986), shows the ionization efficiency in the gas phase of water. It shows that T] starts with a value of 0.4 at the... 

Samson, S. (1969) Structural principles of giant cells. In Development in the Structural Chemistry of Alloy Phases, ed. Giessen, B.C. (Plenum Press, New York), p. 65. 

Lomen PL, Baker LH, Neil GL, Samson MK. Phase I study of 5-azacytidine (NSC-102816) using 24-hour continuous infusion for 5 days. Cancer Chemother Rep 1975 59 1123-1126. 

Samson MK, Fraile RJ, Baker LH, O Bryan R. Phase I-II chnical trial of gallium nitrate (NSC-15200). Cancer Clin Trials 1980 3(2) 131-6. 

Kiziriglou, M.E., Samson, D., Becker, T., Wright, S.W., Yeatman, E.M., 2011. Optimization of heat flow for phase change thermoelectric harvesters. In Power MEMS, Korea. 

The hydroxide and oxide phases that exist for scandium(III) include scandium hydroxide, Sc(OH)3(s), which likely has both amorphous and crystalline forms, ScOOH(s), and scandium oxide. It would be expected that the amorphous hydroxide is the most soluble and Sc203(s) the least. There have been few studies that have examined the solubility of these phases. None of the hydroxide or oxide phases of scandium are known to form naturally, with scandium present, as a major component, in eight mineral phases only (Wood and Samson, 2006). Moreover, there is much conjecture over which phases have actually been studied as well as their crystallinity (Baes and Mesmer, 1976 Wood and Samson, 2006). This review has selected data for both the hydroxide and oxide phases, based largely on the similarity in the stabilities obtained for the phases studied. Baes and Mesmer (1976) provided a stability constant for ScOOH(s) on the basis of data provided by Schindler (1963), but it is believed that the phase actually studied was Sc(OH)3(s) given the similar solubility found in the studies of Feitknecht and Schindler (1963) and Shkolnikov (2009). 

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