Study of the glassy magnetic behaviour and charge-ordering phase transitions in La0.75Ca0.25FeO3−δ perovskite. Issue 16 (3rd June 2017)

• Record Type: Journal Article
• Authors: Abdel-Khalek, E. K.; Mohamed, E. A.; Salem, A. F.
• Is Part Of: Philosophical magazine. Volume 97:Issue 16(2017)
• Page Start: 1346
• Page End: 1359
• Publication Date: 2017-06-03
• Subjects: Perovskite -- X-ray diffraction -- Mössbauer spectroscopy -- magnetic-phase transitions; Condensed matter -- Periodicals; Physics -- Periodicals; Matière condensée -- Périodiques; Physique -- Périodiques; 530.41
• DOI: 10.1080/14786435.2017.1296202
• Languages: English
• ISSNs: 1478-6435

Abstract

Abstract: In this work, La0.75 Ca0.25 FeO3−δ perovskite sample was prepared by the coprecipitation method. The nanoparticle was found to crystallize in the orthorhombic (Pbnm) phase as confirmed by X-ray diffraction (XRD) and transmission electron microscopic (TEM). The oxygen non-stoichiometry (δ) and magnetic states of iron ions (three magnetic sextets and non-magnetic doublet) were investigated by Mössbauer spectroscopy at room temperature (RT). The shape of the magnetic hysteresis loop of the sample reveals the existence of a weak ferromagnetism at RT. The magnetization vs. temperature curves, measured in the 9 to 200 K range, showed that the sample exhibits two magnetic-phase transition temperatures at 29 K (Tg ) and 120 K (TCO ). The magnetization isotherms, M (H), around these magnetic-phase transition temperatures for the sample are analyzed.