Warren-Cowley order parameter

If the coordination numbers of two types of molecules are the same in the solution (z = z b), then the two Warren-Cowley order parameters are also... 

Those Warren-Cowley parameters have been determined in situ above the order-disorder transition temperature by diffuse neutron scattering. From these experimentally determined static correlations, the first nine effective pair interactions have been deduced using inverse Monte Carlo simulations. 

For a solution containing molecules i and j, Warren and Cowley defined an order parameter 77 as ... 

Figure 2.12 shows the variations in Warren and Cowley s order parameter for the quasi-chemical model, with the following values of the parameters T = 800 K, NsWab = 30 kJ and z = 12. The result obtained respects the symmetry of the model, with a minimum for the composition Xa = Xb = 0.5. 

Table 2. Warren-Cowley short-range order parameters for impurities in the (Gao.9325MnJ 04O625M o-oo9375- o.oi75)As alloy at T = 1400 K.

Table 2. Warren-Cowley parameters of ordered structures in their perfectly ordered states.

The ordering processes in the Ni-Mo and Ni-V alloys reproduced by Monte Carlo simulation are discussed based on the pairwise interaction model. Table 2 shows Warren-Cowley parameters a(w) of the ordered structures in their perfectly ordered states. The parameter a(n) is defined by ... 

The quantities of interest to follow the global evolution of precipitation during the simulation are Warren-Cowley short range order (SRO) parameters [5]. SRO parameters for first-nearest neighbors evolve too quickly to give any really significant information on precipitation state. During simulation first steps, Zr atoms surround themselves... 

It is also of interest to obtain information on changes of short-range order (SRO) during irradiation as well as of long-range order (LRO). The state of SRO is usually given by the Cowley-Warren parameters a, that describe the conditional probability (P ba) finding B (A) atoms on the successive coordination shells around A (B) atoms, and which have the form... 

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