Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 255, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2020.123560
Keywords
Solid-state reaction; Rietveld refinement; Magnetic properties; Neel temperature; Ferroelectric properties
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Funding
- University Grants Commission, New Delhi through Basic Science Research fellowship [25-1/2014-15(BSR)/7-305/2010/(BSR)]
- IASc (Bengaluru)
- INSA (New Delhi)
- NASI (Allahabad)
- DST-FIST, New Delhi
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Narrow compositions of (1-x) BiFeO3 - x BaTiO3 (x = 0.23, 0.25, 0.27 and 0.30) ceramics close to morphotmpic phase boundary (MPB) are investigated to understand the interplay among structural phase percentage, bond length, bond angle, net remnant magnetization Neel temperature and remnant polarisation. Phase pure samples of MPB compositions synthesized by a solid-state reaction method. Rietveld refinement yields the phase percentage of MPB compositions for R3c (83.1%, 79%) and Pm (3) over barm (16.9%, 21%) phases of x = 0.27 and 0.30 respectively. SAED patterns confirmed the structural coexistence of rhombohedral and cubic phases along with defect-free in x = 0.27 and 0.30. The net remnant magnetization of the ferromagnetic phase found to have an inverse relation with the Neel temperature of the antiferromagnetic phase. Breaking of the cycloidal arrangement of dipole moment by Ti-ion substitution promotes the ferromagnetic phase. Saturated ferroelectric loops with a field asymmetry are due to strong Bi-O hybridization inferred by the decreased Bi-O bond length. Magnetic and ferroelectric properties are enhanced in the phase pure MPB compositions (x = 0.27 and 0.30).
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