2020/12/30 by Anna N. Morozovska, D. V. Karpinsky, Morozovska, Anna N. +27
Materials Science · #FOS: Physical sciences #Ferroelectric and Piezoelectric Materials #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Multiferroics and related materials
paper · pdf · doi:10.48550/arxiv.2012.15241
openalex publication_date 2020/12/30 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
The physical nature of the ferroelectric (FE), ferrielectric (FEI) and\nantiferroelectric (AFE) phases, their coexistence and spatial distributions\nunderpin the functionality of antiferrodistortive (AFD) multiferroics in the\nvicinity of morphotropic phase transitions. Using Landau-Ginzburg-Devonshire\n(LGD) phenomenology and a semi-microscopic four sublattice model (FSM), we\nexplore the behavior of different AFE, FEI and FE long-range orderings and\ntheir coexistence at the morphotropic phase boundaries in FE-AFE-AFD\nmultiferroics. These theoretical predictions are compared with the experimental\nobservations for dense Bi1-yRyFeO3 ceramics, where R is Sm or La atoms with the\nfraction 0 < y< 0.25, as confirmed by the X-ray diffraction (XRD) and\nPiezoresponse Force Microscopy (PFM). These complementary measurements were\nused to study the macroscopic and nanoscopic transformation of the crystal\nstructure with the doping. The comparison of the measured and calculated AFE/FE\nphase fractions demonstrate that the LGD-FSM approach well describes the\nexperimental results obtained by XRD and PFM for Bi1-yRyFeO3. Hence, this\ncombined theoretical and experimental approach provides further insight into\nthe origin of the morphotropic boundaries and coexisting FE and AFE states in\nmodel rare-earth doped multiferroics.\n