3.0.1 General remarks

Stability of Tetravalent Actinides in Perovskites

“…A useful parameter by which the stability of perovskites can be judged is the Goldschmidt tolerance factor t (25). In a study of the thermochemistry of the lanthanide(ivj" perovskites Ba(Ce,Pr,Tb)0 3, Morss and Mensi (7) showed that the tolerance factor correlates roughly with AHTcomplex), i.e., AE for the reaction (2).…”

Surface Studies of Re3Fe5O12Garnets, ReFeO3Orthoferrites and ReVO4Orthovanadates

“…The rare earth orthoferrites and garnets are widely studied series of compounds because of their possible applications as technological magnetic materials [1,2].…”

“…The rare earth orthoferrites ReFeO3 crystallize with the orthorhombic distortion of the perovskite stucture [1]. There are two nonequivalent positions O (1) and O(2) of oxygen ions in the orthoferrite unit cell, where the number ratio O(2):O(1) = 2:1.…”

“…There are two nonequivalent positions O (1) and O(2) of oxygen ions in the orthoferrite unit cell, where the number ratio O(2):O(1) = 2:1. The both O(1) and O(2) sites have four Re3 + neighbors at average distance equal to, e.g.…”

“…In these compounds the iron lattice orders around 700 K and the rare earth lattice only at a few degrees Kelvin. Therefore at room (329) temperature the strongest interaction in the orthoferrites is the antiferromagnetic coupling of the iron moments [1].…”