The influence of oxygen content on the magnetization and electrical resistivity of Ln_0,5A_0,5MnO₃ (Ln = La, Pr, Nd; A = Ca, Ba) manganites with the perovskite structure is investigated. It is shown that the La_0,5Ca_0,5MnO_{3 - g} compound undergoes a sequence of transitions from an antiferromagnetic (g = 0) to a spin-glass (g = 0,17) state and then to an inhomogeneous ferromagnetic (g = 0,3) state. A transition from an antiferromagnetic charge-ordered state to a ferromagnetic charge-disordered state in Nd_0,5Ca_0,5MnO_{3 - g} is observed as the oxygen content is reduced to where g = 0,07. The Nd_0,5Ba_0,5MnO_{3 - g} compound shows an increase of the Curie point from 110 K (g = 0) up to 310 K (g = 0,3). In addition, a large magnetoresistance is revealed which develops below their Curie temperature despite the absence of Mn³⁺ - Mn⁴⁺ pairs. A Zener double-exchange interaction is usually used in literature to explain the magnetic and electrical properties of hole-doped perovskite manganites. The data obtained support the mechanism of superexchange interactions between magnetic moments of the manganese ions via oxygen.

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