The structural, resistive, magnetic, and magnetoresistive properties of the La0.6Sr0.3 - x Bi (x) Mn1.1O3 ceramics have been studied. The substitution of Bi ions for Sr ions increases the lattice parameter of the rhombohedral perovskite structure, decreases the metal-semiconductor and ferromagnet-paramagnet phase transition temperatures and the peak of the magnetoresistive effect, and increases the resistivity, approaching the system to the ferroelectric state. The Mn-55 NVR study indicates on the high-frequency Mn3+ a dagger" Mn4+ superexchange and heterogeneity of the valence and magnetic states of manganese due to the nonuniformity of distribution of all ions and defects. The phase diagram has been constructed, which shows a strong correlation between the structural, magnetic, and magnetoresistive properties.
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Univ Monastir, Fac Sci, Ave Environm, Monastir 5019, Tunisia
Univ Sfax, Fac Sci Sfax, Lab Phys Appl, BP 1171, Sfax 3000, TunisiaUniv Monastir, Fac Sci, Ave Environm, Monastir 5019, Tunisia
Dhahri, Ah.
Dhahri, E.
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Univ Sfax, Fac Sci Sfax, Lab Phys Appl, BP 1171, Sfax 3000, TunisiaUniv Monastir, Fac Sci, Ave Environm, Monastir 5019, Tunisia
Dhahri, E.
Hlil, E. K.
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CNRS, Inst Neel, BP 166, F-38042 Grenoble, France
Univ Joseph Fourier, BP 166, F-38042 Grenoble, FranceUniv Monastir, Fac Sci, Ave Environm, Monastir 5019, Tunisia
机构:
Sidi Mohamed Ben Abdellah Univ, Fac Sci Dhar El Mahraz, Lab Solid Phys, BP 1796, Fes, MoroccoSfax Univ, Fac Sci Sfax, LM2EM, BP 1171, Sfax 3000, Tunisia
Masrour, R.
Jotania, R.
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Gujarat Univ, Univ Sch Sci, Dept Phys Elect & Space Sci, Ahmadabad 380009, Gujarat, IndiaSfax Univ, Fac Sci Sfax, LM2EM, BP 1171, Sfax 3000, Tunisia