Ordering and Anti-Site AS Disorder in Double Perovskites

AS disorder has a direct influence on the magnetic properties of the double perovskites. It is observed in FM double perovskites that the 

On the other hand, to explain the magnetisation and a reduced Ms in n-type metallic double perovskite system, Sr2 xCaa FeMo06 (0 x 2), Goodenough and Dass invoked the idea of anti-phase boundaries (APB). 

It is apparent that correct estimation of the percentage order is important for precisely understanding the magnetic properties. The extent of ordering (or AS disorder) can be determined by the Rietveld refinement of the structure employing powder neutron or X-ray diffraction. In a cubic double perovskite with Fm3m space group symmetry, a new set of 

As mentioned in Section 5.5.1, apart from the intrinsic effect of size and charge difference on B-cation ordering in double perovskites, the synthesis condition plays a pivotal role on the degree of ordering. 

While Balcells et reported progressive increase of cation order with rise in sintering temperature, according to Shimada et a kinetic or 

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