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Author published in "Journal of Alloys and Compounds" affiliate to

College of Science and Engineering

Chi-Shun Tu

Department of Physics,

Fu Jen Catholic University, New Taipei City, Taiwan

Article published in 

"Journal of Alloys and Compounds", Volume 768, 5 November 2018, Pages 903-913

Composition and thermal structural evolution in Pr modified bismuth ferrite near the morphotropic phase boundary

Nanoscale domains and structural disorder are important phenomena in lead-free rare-earth-substituted bismuth ferrite in the vicinity of the morphotropic phase boundary (MPB). This work highlights substitution-driven transitions in (Bi1-xPrx)FeO3 (x = 0.05–0.25) polycrystalline ceramics from ferroelectric (FE) rhombohedral R3c to antiferroelectric (AFE) orthorhombic Pbam, then nonpolar orthorhombic Pnma phases as the system crosses over the MPB, identified by the 12{ooo}, 12(011), 14{111}, and 12{100} electron superlattice diffraction patterns. Enhanced ferromagnetic (FM) magnetizations near the MPB may result from a minor Fe4+ valence state and structural disorder. Sequential temperature-dependent phase transitions were observed and the orthorhombic Pnma phase becomes a dominant phase upon heating. The decreased O 2p–Fe 3d orbital hybridization plays a critical role for substitution-driven and thermally-activated structural transitions in the vicinity of the MPB. [Full article]