Multiferroic BiFeO crystals were investigated by means of micro-Raman spectroscopy using the laser wavelengths of 442 nm (resonant conditions) and 633 nm (non-resonant conditions). The azimuthal angle dependence of the intensity of the Raman modes allowed their symmetry assignment. The experimental data are consistent with a simulation based on Raman tensor formalism. Mixed symmetries were taken into account, considering the orientation of the crystal optic axis along a pseudo-cubic <111> direction. The strong anisotropic intensity variation of some of the polar Raman modes was used for line scans and mappings in order to identify ferroelastic domain patterns. The line scans performed with different excitation wavelengths and hence different information depths indicate a tilt of the domain walls with respect to the sample surface. The domain distribution found by Raman spectroscopy is in very good agreement with the finding of electron back scattering diffraction.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6344528 | PMC |
| http://dx.doi.org/10.1038/s41598-018-36462-5 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Atomic-scale structure of ZrO: Formation of metastable polymorphs.
Sci Adv
January 2025
Department of Nuclear Engineering, University of Tennessee, Knoxville, TN 37996, USA.
Metastable phases can exist within local minima in the potential energy landscape when they are kinetically "trapped" by various processing routes, such as thermal treatment, grain size reduction, chemical doping, interfacial stress, or irradiation. Despite the importance of metastable materials for many technological applications, little is known about the underlying structural mechanisms of the stabilization process and atomic-scale nature of the resulting defective metastable phase. Investigating ion-irradiated and nanocrystalline zirconia with neutron total scattering experiments, we show that metastable tetragonal ZrO consists of an underlying structure of ferroelastic, orthorhombic nanoscale domains stabilized by a network of domain walls.
View Article and Find Full Text PDFAn organic-inorganic hybrid ferroelastic with a near-room-temperature phase transition.
Dalton Trans
December 2024
Ordered Matter Science Research Center, Nanchang University, 330031, P. R. China.
Organic-inorganic hybrid metal halides (OIMHs) with ferroelastic phase transition properties have recently attracted great attention due to their widespread application prospects in the fields of energy storage, sensors, switches, . However, most of the hybrid ferroelastics exhibit phase transition points () far beyond room temperature, which may limit their applications in mechanical switches and energy storage for daily working requirements. Herein, we synthesized a new zinc halide OIMH ferroelastic (,)-[BPHD]ZnBr (BPHD = 1,6-bis(piperidine-1-yl) hexa-2,4-diene diamide), which experiences a 2/1̄ type paraelastic-ferroelastic phase transition at a near-room-temperature of 285 K.
View Article and Find Full Text PDFIn-line tempering eliminates the domain boundary in perovskite single crystals for high-energy resolution ionizing radiation detectors.
Sci Adv
December 2024
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
Metal halide perovskite single crystals (SCs) emerge as a promising candidate for ionizing radiation detection. The realization of top-performing radiation detectors typically relies on careful crystal selection from broad candidate groups, as residual strain remains unavoidable during the SC growth process, which often leads to the formation of ferroelastic domains with varied orientations. Here, we introduce an in-line tempering strategy to alleviate microstrain and homogenize the domain orientation across methylammonium lead iodide (MAPbI) perovskite SCs.
View Article and Find Full Text PDFFerroelasticity and Canted Antiferromagnetism in Two-Dimensional Organic-Inorganic Layered Perovskite [CH(CH)NH]FeCl.
ACS Omega
December 2024
Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
Two-dimensional organic-inorganic perovskites have been attracted as candidates for multiferroic materials that exhibit two or more ferroic orders such as ferromagnetism, ferroelectricity, ferroelasticity, and ferrotoroidicity. Here, we introduce the structure, ferroelastic domains and magnetic properties of the two-dimensional organic-inorganic perovskite [CH(CH)NH]FeCl (CHEA-Fe) composed of 2-(1-cyclohexenyl)ethylammonium and FeCl . CHEA-Fe underwent two ferroelastic phase transitions from tetragonal to orthorhombic at 332 K and to monoclinic at 232 K with decreasing temperature and exhibited ferroelastic domains under polarized light as a consequence of these ferroelastic phase transitions.
View Article and Find Full Text PDFFerroelastic Domain Switching and Time-Resolved Negative Capacitance in Polar-Axis-Oriented HfZrO Grown by Atomic Layer Epitaxy.
Small
December 2024
Department of Materials Science and Engineering, National Taiwan University, Taipei, 106319, Taiwan.
Ferroelectric properties of HfZrO are strongly correlated with its crystallographic orientation, with the [001] direction serving as the polar axis. However, the epitaxial growth of highly polar-axis-oriented HfZrO layers with pronounced ferroelectricity is rarely reported. Here epitaxial (001)-oriented HfZrO thin films grown by atomic layer epitaxy (ALE) is demonstrated, which achieve a state-of-the-art ferroelectric polarization up to 78.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!