Observation of Enhanced Dielectric Coupling and Room-Temperature Ferromagnetism in Chemically Synthesized BiFeO3@SiO2 Core–Shell Particles
作者： Mandar M. Shirolkar , Raja Das , Tuhin Maity , Pankaj Poddar , Sulabha K. Kulkarni
DOI: 10.1021/JP3025683
关键词: Nuclear magnetic resonance 、 Electron density 、 Dielectric 、 Ferromagnetism 、 Conductivity 、 Condensed matter physics 、 Coating 、 Lattice (order) 、 Alternating current 、 Materials science 、 Dissipation factor
摘要: We report the effect of SiO2 coating on structural, magnetic, and dielectric properties chemically synthesized high-purity BiFeO3 particles. The as-synthesized particles demonstrate comparable with those reported for bulk BiFeO3. On other hand, structural measurement BiFeO3@SiO2 shows that has anisotropically compressed lattice stimulates variation in electron density. This affects magnetic behavior material. Frequency-dependent constant study at low temperature (20–325 K) revealed slight reduction (8–10%) compared to uncoated reveals five anomalies 234, 206, 146, 84, 25 K located close proximity linear magnetodielectric coupling spin reorientation transitions. loss tangent (≈10–3) alternating current (ac) conductivity (≈10–8 Ω–1cm–1) are orders magnitude...
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