Domain radius composition

The synthesis of these materials is outlined in Scheme I. Transmission electron microscopy shows that the morphology of nearly equimolar compositions of the siloxane-chloromethylstyrene block copolymers is lamellar, and that the domain structure is in the order of 50-300 A. Microphase separation is confined to domains composed of similar segments and occurs on a scale comparable with the radius of gyration of the polymer chain. Auger electron spectroscopy indicates that the surface of these films is rich in silicon and is followed by a styrene-rich layer. This phenomenon arises from the difference in surface energy of the two phases. The siloxane moiety exhibits a lower surface energy and thus forms the silicon-rich surface layer. 

A quantitative physical description of the stellar interior is provided by a solution to these equations, i.e. by the run of P,T,m and l as a function of r throughout the domain 0 < r < R, the radius of the star. These solutions are characterised uniquely by M = m(R), the total mass of the star, and by Xj(r), the run of chemical composition through the star. Various approximate and numerical schemes will be examined in Sects. 10-11. 

The condition expressed by Eq. (3.19) is no longer valid as type 11 electrode materials have narrow nonstoichiometric domains (Fig. 3.7). When the host lattice contains a transition-metal element M, the electrons injected in the insertion process are distributed in the empty d orbitals. The decrease in the formal oxidation state results in a change of either the ionic radius of the coordination shell symmetry (Jahn-Teller effect), inducing strains on the (77) framework. This situation is expressed as a strong positive interaction term proportional to the number of intercalated species (Eq. 3.19). It appears that the existence of a maximum of potential V(x) implies some instability in the [e-2] domain. As a consequence, the voltage composition curve shows a plateau in the forbidden composition range due to the equilibrium of the two pseudo-phases. 

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