Journal ArticleDOI
Improved dielectric and magnetic properties of Ti modified BiCaFeO3 multiferroic ceramics
Reads0
Chats0
TLDR
In this paper, powder X-ray diffraction investigations performed at room temperature show that all samples possess a rhombohedrally distorted perovskite structure described by the space group R3c.Abstract:
Ti substituted BiCaFeO3 ceramics having compositions Bi0.8Ca0.2Fe1−xTixO3 (x = 0.0, 0.1, 0.2) were synthesized by the conventional solid state reaction method. Powder X-ray diffraction investigations performed at room temperature show that all samples possess a rhombohedrally distorted perovskite structure described by the space group R3c. Rietveld refinement presented a good agreement between the observed and calculated patterns. Dielectric response of these samples was analyzed in the frequency range 1 kHz–5 MHz at different temperatures. Dispersion in dielectric constant (έ) and dielectric loss factor (tanδ) values decreases with Ti substitution. έ increases and tanδ decreases significantly by Ti substitution. Magnetic measurements were carried out at room temperature up to a field of 20 kOe. Magnetic properties of Bi0.8Ca0.2FeO3 ceramic are greatly improved on Ti substitution along with a significant opening in the room temperature M-H hysteresis loop. The values of remnant magnetization (Mr) 0.08 and...read more
Citations
More filters
Journal ArticleDOI
Evidence of improved ferroelectric phase stabilization in Nd and Sc co-substituted BiFeO3
T. Durga Rao,Saket Asthana +1 more
TL;DR: In this paper, polycrystalline BiFeO3 and Bi0.9Nd0.1O3 compounds were prepared using conventional solid-state route and X-ray diffraction studies and Raman measurements indicated that the compounds were crystallized in rhombohedral structure with R3c space group.
Journal ArticleDOI
Enhanced ferromagnetic properties in Ho and Ni co-doped BiFeO3 ceramics
TL;DR: The magnetic properties of polycrystalline Bi1-xHoxFe1-yNiyO3 (x = 0, 0.1; y = 0.03), which were prepared by the solid-state method, have been investigated.
Journal ArticleDOI
Rietveld refinement, dielectric and magnetic properties of NBT-Spinel ferrite composites
TL;DR: Ferrite-ferroelectric composites having general formula (1-x)Na0.5Bi 0.5TiO3-(x)Ni0.25Mg 0.25Fe2O4 were developed by conventional solid state reaction method as mentioned in this paper.
Journal ArticleDOI
Improved structure stability, optical and magnetic properties of Ca and Ti co-substituted BiFeO 3 nanoparticles
Vijay Kumar,Satyendra Singh +1 more
TL;DR: In this paper, the optical and magnetic properties of single-crystalline Ca and Ti co-substituted bismuth ferrite, Bi1-xCaxFe 1-xTixO3, nanoparticles, synthesized by a facile sol-gel methodology in the compositional range wherein 0 ≤ ≥ 0.25 indicates a possibility of utilizing for photocatalytic activities.
Journal ArticleDOI
Ca-Doping of BiFeO3: The Role of Strain in Determining Coupling between Ferroelectric Displacements, Magnetic Moments, Octahedral Tilting, and Oxygen-Vacancy Ordering.
TL;DR: Elastic and anelastic properties of a member of the BiFeO3–CaFeO2.5 perovskite solid solution (BCFO), which is known to have multiple instabilities, have been investigated by resonant ultrasound spectroscopy, confirming that conventional coupling of magnetic order with symmetry-breaking shear strains is weak in BCFO.
References
More filters
Journal ArticleDOI
EXPGUI, a graphical user interface for GSAS
TL;DR: A description and justification of the EXPGUI program, which implements a graphical user interface and shell for the GSAS single-crystal and Rietveld package using the Tcl/Tk scripting language, is presented.
Journal ArticleDOI
Multiferroic and magnetoelectric materials
TL;DR: A ferroelectric crystal exhibits a stable and switchable electrical polarization that is manifested in the form of cooperative atomic displacements that arises through the quantum mechanical phenomenon of exchange.
Journal ArticleDOI
Revival of the Magnetoelectric Effect
Abstract: Recent research activities on the linear magnetoelectric (ME) effect?induction of magnetization by an electric field or of polarization by a magnetic field?are reviewed. Beginning with a brief summary of the history of the ME effect since its prediction in 1894, the paper focuses on the present revival of the effect. Two major sources for 'large' ME effects are identified. (i) In composite materials the ME effect is generated as a product property of a magnetostrictive and a piezoelectric compound. A linear ME polarization is induced by a weak ac magnetic field oscillating in the presence of a strong dc bias field. The ME effect is large if the ME coefficient coupling the magnetic and electric fields is large. Experiments on sintered granular composites and on laminated layers of the constituents as well as theories on the interaction between the constituents are described. In the vicinity of electromechanical resonances a ME voltage coefficient of up to 90?V?cm?1?Oe?1 is achieved, which exceeds the ME response of single-phase compounds by 3?5 orders of magnitude. Microwave devices, sensors, transducers and heterogeneous read/write devices are among the suggested technical implementations of the composite ME effect. (ii) In multiferroics the internal magnetic and/or electric fields are enhanced by the presence of multiple long-range ordering. The ME effect is strong enough to trigger magnetic or electrical phase transitions. ME effects in multiferroics are thus 'large' if the corresponding contribution to the free energy is large. Clamped ME switching of electrical and magnetic domains, ferroelectric reorientation induced by applied magnetic fields and induction of ferromagnetic ordering in applied electric fields were observed. Mechanisms favouring multiferroicity are summarized, and multiferroics in reduced dimensions are discussed. In addition to composites and multiferroics, novel and exotic manifestations of ME behaviour are investigated. This includes (i) optical second harmonic generation as a tool to study magnetic, electrical and ME properties in one setup and with access to domain structures; (ii) ME effects in colossal magnetoresistive manganites, superconductors and phosphates of the LiMPO4 type; (iii) the concept of the toroidal moment as manifestation of a ME dipole moment; (iv) pronounced ME effects in photonic crystals with a possibility of electromagnetic unidirectionality. The review concludes with a summary and an outlook to the future development of magnetoelectrics research.
Journal ArticleDOI
Physics and Applications of Bismuth Ferrite
Gustau Catalan,James F. Scott +1 more
TL;DR: In this paper, the authors summarize both the basic physics and unresolved aspects of BiFeO3 and device applications, which center on spintronics and memory devices that can be addressed both electrically and magnetically.
Journal ArticleDOI
Multiferroics: progress and prospects in thin films.
TL;DR: Novel device paradigms based on magnetoelectric coupling are discussed, the key scientific challenges in the field are outlined, and high-quality thin-film multiferroics are reviewed.