Abstract
AbstractThe K2NiF4 phases La1+xSr1–xCo0.5Cr0.5O4±δ (x = 0, 0.15) and La1+xSr1–xCo0.5Mn0.5O4±δ (x = 0, 0.2) have been synthesised and examined by X‐ray powder diffraction, thermal analysis, neutron powder diffraction and magnetic susceptibility measurements. Mn3+/Co3+ and Cr3+/Co3+ states predominate in the oxidised forms. Structural stability and crystal symmetry are retained under reducing conditions which cause reduction of Co3+ into Co2+ and the creation of oxide ion vacancies within the equatorial planes of the K2NiF4 structure. Excess oxygen in La1.2Sr0.8Co0.5Mn0.5O4.1 is accommodated in the ideal interstitial positions (0, 0.5, 0.25) of the tetragonal structure of these materials in an oxygen/air atmosphere. No long‐range magnetic order has been observed because of competing AFM and FM interactions in these B‐site disordered materials.
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