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|Type:||Artigo de periódico|
|Title:||Kinetics Of Ordering In Graphite-sbcl5 Studied By Esr|
|Abstract:||Spin-resonance experiments allowed us to study the kinetics of ordering in the quasi-two-dimensional order-disorder phase transition observed at Tc=2102 K in stage-4 SbCl5-intercalated graphite. Quenching from the disordered phase (TTc) reveals a time broadening of the linewidth with a scaling behavior (tn), which we attribute to the time growth of the average linear domain size of a weakly incommensurate superlattice. Fittings of the experimental data give n0.48 for T<Tc and n0.55 for T>Tc, which are close to the exponents obtained in Monte Carlo simulations for domain growth of degenerate superlattices. For TTc a much faster kinetics is observed, which may indicate the presence of critical phenomena. A more sluggish kinetics is observed after an elapsed time of approximately 50 min, and at low temperatures (TTc), the results indicate that the system is in a metastable frozen-in state. © 1987 The American Physical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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