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First principles electronic structure calculations have been carried out onordered double perovskites Sr_2B'B"O_6 (for B' = Cr or Fe and B" 4d and 5dtransition metal elements) with increasing number of valence electrons at theB-sites, and on Ba_2MnReO_6 as well as Ba_2FeMoO_6. The Curie temperatures areestimated ab initio from the electronic structures obtained with the localspin-density functional approximation, full-potential generalized gradientapproximation and/or the LDA+U method (U - Hubbard parameter). Frozenspin-spirals are used to model the excited states needed to evaluate thespherical approximation for the Curie temperatures. In cases, where the inducedmoments on the oxygen was found to be large, the determination of the Curietemperature is improved by additional exchange functions between the oxygenatoms and between oxygen and B' and B" atoms.  A pronounced systematics can be found among the experimental and/orcalculated Curie temperatures and the total valence electrons of the transitionmetal elements.

Magnetic and electric properties of double-perovskites and estimation of their Curie temperatures by ab initio calculations