Landau-Ginsburg parameter

A simple quantitative model, with no adjustable parameters, is developed for the finite size effect of ferroelectric particles on the Curie transition temperature. As the size of ferroelectric particles decreases, the Curie temperature decreases. Based on our model for lattice contraction and the Landau-Ginsburg-Devonshire (LGD) phenomenological theory, size effects on Curie temperature of lead zirconate titanate PbZri. Ti Oj (PZT, x > 0.6) are considered. It is shown that Curie temperature of PZT (x > 0,6) decreases with decreasing particle size. The predictions of our equation are in agreement with the experimental results. 

Earlier, Homreich, Luban and Shtrikman had proposed a new type of higher order critical point, which they called the Lifshitz point, by considering a Landau-Ginsburg free energy expansion in terms of a scalar order parameter M for a magnetic system... 

Earlier [14] a ratio connecting the Ginsburg-Landau parameter % of niobium with the value of specific electroresistivity p was obtained ... 

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