Электронный каталог

Статья

Truong-Son, L.V.
Structural Distortions and Electromagnetic Response in Single-Phase Imma Bi&sub(0.84)La&sub(0.16)Fe&sub(1-x)Mn&sub(x)O&sub(3) Multiferroics / L.V.Truong-Son, L.H.Khiem, E.A.Korneeva, V.T.Nguyen, N.T.Nguyen, A.V.Rutkauskas, [a.o.]. – Text : electronic // Ceramics International. – 2026. – Vol. 52, No. 19. – P. 35365-35375. – URL: https://doi.org/10.1016/j.ceramint.2026.06.067. – Bibliogr.: 66.

The coexistence of multiple phases at the morphotropic phase boundary has long obscured the intrinsic electromagnetic properties of co-substituted BiFeO&sub(3). In this work, we report the stabilization of a single-phase orthorhombic Imma structure in Bi&sub(0.84)La&sub(0.16)Fe&sub(1-x)Mn&sub(x)O&sub(3) (x = 0.1–0.4), contrasting with the multiphase regions typically reported. The structural, valence, ferroelectric, and magnetic properties were systematically investigated using complementary techniques, including X-ray and neutron diffraction, Raman spectroscopy, X-ray photoemission spectroscopy, Mossbauer ¨ spectroscopy, and electrical/magnetic measurements. Integrated analyses reveal that while the bulk maintains stable Fe&sup(3+) and Mn&sup(3+) states, additional mixed-valence Fe&sup(2+) and Mn&sup(4+) are predominantly localized at the surface. Increasing Mn concentration enhances Jahn-Teller distortions, leading to (Fe/Mn)O&sub(6) octahedral modifications. Concurrently, the competition between exchange interactions results in a progressive weakening of the long-range G-type antiferromagnetic order. A magnetic transition occurs from a semi-hard weak ferromagnetism (x *{ 0.3) to a soft-ferromagnetic cluster state embedded in the antiferromagnetic matrix at x = 0.4. Electrically, the polarization response reflects a complex convolution of intrinsic local dipole switching and extrinsic conductive loss. Ferroelectric-like behavior persists at low Mn content (x *{ 0.2), while higher doping leads to leakage-dominated conduction, primarily associated with Mn&sup(3+)/ Mn&sup(4+) hoping. These results demonstrate an effective strategy for tuning multiferroic functionalities through phase-boundary engineering.



Спец.(статьи,препринты) = С 342 г1 - Замедление и диффузия нейтронов. Дифракция
Спец.(статьи,препринты) = С 36 - Физика твердого тела$
ОИЯИ = ОИЯИ (JINR)2026