The magnetic coupling constants of KCuF3, Sr2CuO2Cl2, La2CuO4, La2NiO4, K2NiF4, KNiF3, NiF2, KMnF3, and MnF2 are calculated with a hybrid density functional, in which 35% of the nonlocal Hartree-Fock exchange is mixed in the general gradient approximation to the density functional theory. The theoretical magnetic coupling constants for these materials with different structures, spins, and magne...

La2NiO4+δ particles with a plate-like morphology were prepared from NaOH melt by molten-flux synthesis. For this purpose, the intermediates sol–gel process used as reactants. Using powder X-ray diffraction, identified mixture of tetragonal La2O2CO3 and cubic NiO. The existence NiO was also confirmed transmission electron microscopy in combination electron-energy loss spectroscopy. ultrafine mix...