Spin-glass to long-range order to spin-glass evolution of magnetic properties with the composition in Sm2MnZnMn4−Ti O12 (x = 1, 2, and 3) perovskites

A-Site Columnar-Ordered Perovskite CaZnV2O6 as a Pauli-Paramagnetic Metal

“…It would come from the fact that high-pressure synthesis can stabilize cations with high coordination numbers . Similarly, an unusual 10-coordinated manganese has been reported to slightly substituted A-site cation of high-pressure synthesized A-site columnar-ordered perovskites. − The refined structural parameters of CaZnV 2 O 6 (= Ca 0.977 Zn 0.023 ZnV 2 O 6 ) with the splitting of the A′-site Zn are listed in Table . The bond valence sums (BVSs), selected bond lengths, and bond angles are tabulated in Table .…”

Anisotropic Thermal Expansion and a Second-Order Charge Order Transition in the Ferrimagnetic Dy2CuZnMn4O12 Perovskite with Triple A-Site Cation Ordering

“…Small antisite disorders are often realized in A 2 A′A″B 4 O 12 perovskites with A = rare earths, A′ = Mn, and A″ = Mn. Such antisite disorders could be observed with synchrotron XRPD data as small (but detectable) deviations of occupation factors from unity (for ideal cation distribution models). − , However, during the structural analysis of Dy 2 CuZnMn 4 O 12 , all cation occupation factors converged to values close to unity. We report here the occupation factors at 600 K as the symmetry at 600 K is higher (see below) and the number of refined structural parameters is smaller.…”

“…In comparison with classical ABO 3 perovskites with one type of A sites and A-site-ordered quadruple perovskites, AA′ 3 B 4 O 12 , with intrinsically two types of A sites (A with a 12-fold coordination and A′ with a square-planar coordination), A 2 A′A″B 4 O 12 perovskites have an additional degree of freedom in the presence of the A″ site with a tetrahedral coordination (as the first coordination sphere). Therefore, a principally different, new set of cations, which are not usually located at A sites of perovskites, can be used for the A′′ site, such as Ga 3+ and Zn 2+ . − …”