Correlation between Ionic Radius of Substituting Element and Magnetic Properties of Bi1-xAxFeO3-x/2 (A= Ca, Sr, Pb, Ba) Multiferroics

2009 ◽  
Vol 152-153 ◽  
pp. 131-134 ◽  
Author(s):  
V.A. Khomchenko ◽  
Michael Kopcewicz ◽  
Armandina M. Lima Lopes ◽  
Yuri G. Pogorelov ◽  
J.P. Araujo ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Spin Structure ◽  
Ionic Radius ◽  
Oxygen Vacancies ◽  
Magnetic State ◽  
Weak Ferromagnetism ◽  
Host Lattice ◽  
A Site ◽  
Spiral Spin

Investigation of crystal structure and magnetic properties of the diamagnetically- substituted Bi1-xAxFeO3-x/2 (A= Ca, Sr, Pb, Ba; x= 0.2, 0.3) polycrystalline samples has been carried out. It has been shown that the heterovalent A2+ substitution result in the formation of oxygen vacancies in the host lattice. The solid solutions have been found to possess a rhombohedrally distorted perovskite structure described by the space group R3c. Magnetization measurements have shown that the magnetic state of these compounds is determined by the ionic radius of the substituting elements. A-site substitution with the biggest ionic radius ions has been found to suppress the spiral spin structure of BiFeO3 giving rise to the appearance of weak ferromagnetism.

Effect of Diamagnetic A2+ Substitution on the Magnetic and Ferroelectric Properties of the Bi1−xAxFeO3 Multiferroics

2007 ◽  
Vol 1034 ◽  
Author(s):  
V. A. Khomchenko ◽  
D. A. Kiselev ◽  
J. M. Vieira ◽  
Li Jian ◽  
A. M. L. Lopes ◽  
...  
Keyword(s):  
Spin Structure ◽  
Ionic Radius ◽  
Ferroelectric Properties ◽  
Piezoresponse Force Microscopy ◽  
Weak Ferromagnetism ◽  
Force Microscopy ◽  
Microscopy Data ◽  
A Site ◽  
Induced Changes ◽  
Spiral Spin

AbstractInvestigation of crystal structure, magnetic and local ferroelectric properties of the diamagnetically-doped Bi1−xAxFeO3 (A= Ca, Sr, Pb, Ba; x= 0.2, 0.3) ceramic samples has been carried out. It has been shown that the solid solutions have a rhombohedrally distorted perovskite structure described by the space group R3c. Piezoresponse force microscopy data have revealed the existence of the spontaneous ferroelectric polarization in the samples at room temperature. Magnetization measurements have shown that the magnetic state of these compounds is determined by the ionic radius of the substituting elements. A-site substitution with the biggest ionic radius ions has been found to suppress the spiral spin structure of BiFeO3 and to result in the appearance of weak ferromagnetism. The magnetic properties have been discussed in terms of doping- induced changes in the magnetic anisotropy.

scholarly journals Effect of octahedron tilt on structure and magnetic properties of bismuth ferrite

2020 ◽  
Author(s):  
Yang Hong ◽  
Jun Li ◽  
Han Bai ◽  
Zhenjia Song ◽  
Ming Wang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spin Structure ◽  
Bismuth Ferrite ◽  
Hysteresis Loops ◽  
Rhombohedral Structure ◽  
Raman Analysis ◽  
Natural Resonance ◽  
State Method ◽  
A Site ◽  
Spiral Spin

Abstract Multiferroic trivalent ions doped BiFeO3 ceramics were synthesized using the rapid liquid state method. The trivalent ions (Sm3+, Gd3+, Y3+) doping causes structural distortion without changing the rhombohedral structure. Raman analysis shows that the effect of doping on E modes is greater than A1 modes, and FeO6 octahedron is regulated by ions doping. M-H hysteresis loops show A-site trivalent ions doped samples exhibit improved magnetism compared with pure BiFeO3 since the suppressed spiral spin structure. Doped samples exhibited natural resonance around 16~17 GHz due to the changes in dielectric loss caused by the tilt of the FeO6 octahedron.

Decoupling of the Magnetic State in RuSr2Eu1.5Ce0.5Cu2O10-δ

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3617-3621 ◽  
Author(s):  
I. Felner ◽  
E. Galstyan
Keyword(s):  
Magnetic Properties ◽  
Elevated Temperatures ◽  
Magnetic State ◽  
Hysteresis Loops ◽  
Weak Ferromagnetism ◽  
The Other ◽  
Zn Substitution ◽  
Other Hand ◽  
Three Samples ◽  
Ferromagnetic Hysteresis

We have studied the effect of Zn substitution for Cu, on the superconducting (SC) and magnetic properties of RuSr 2 Eu 2-x Ce x( Cu 1-x Zn x)2 O 10 (Ru-1222) for x = 0, 0.01 and 0.025. Similar to all other Zn doped HTSC materials, Zn reduces TC, from TC = 38 to 26 K for x = 0 and 0.01 respectively. The system with x = 0.025 is not SC down to 4.2 K. On the other hand, the magnetic state of the Ru sublattice is not significantly affected by the presence or absence the SC State. Thus, the two states are practically decoupled. The wide ferromagnetic hysteresis loops which open at 5 K close themselves at elevated temperatures and the remanent magnetizations (Mrem) and the coercive fields (HC) become zero around Tirr = 80 K . Surprisingly, at Tirr < T < TM a reappearance of the Mrem and HC (with a peak at 120 K) is observed for all three samples studied. We argue that the Ru-1222 system becomes (i) Anti-ferromagnetically (AFM) ordered at TM. (ii) At Tirr < TM, weak-ferromagnetism (W–FM) is induced by the canting of the Ru moments. (iii) At TC (TM/TC ~ 4), the system becomes SC and both SC and W–FM states coexist.

Formation of Ferromagnetic/Ferroelectric Superlattices by a Laser MBE and Their Electric & Magnetic Properties

1997 ◽  
Vol 494 ◽  
Author(s):  
Hitoshi Tabata ◽  
Kenji Ueda ◽  
Tomoji Kawai
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Spin Structure ◽  
Piezoelectric Effect ◽  
Ferromagnetic Material ◽  
Ferromagnetic Order ◽  
Laser Mbe ◽  
Perovskite Type ◽  
Laser Ablation Technique ◽  
Similar Crystal Structure

ABSTRACTWe have constructed artificial superlattices with a combination of magnetic/magnetic and ferroelectric/ferromagnetic materials using a laser ablation technique. An ideal hetero-epitaxy can be obtained due to the similar crystal structure of the perovskite type di/ferroelectric BaTiO3, Pb(Zr,Ti)O3 (so-called PZT), SrTiO3 and ferro/antiferromagnetic LaFeO3, LaCrO3, (La,Sr)MnO3. First of all, we have controlled ferromagnetic order on LaFeO3/LaCrO3 superlattices formed on SrTiO3(l11) substrate. Such a spin structure(ferromagnetic order) can't be got in bulk condition. In the heterostructured ferromagnetic /ferroelectric devices, (La,Sr)MnO3/PZT there are remarkable and interesting phenomena. The electric properties of the ferromagnetic material can be controlled by the piezoelectric effect via distortion of the crystal structure.

Insight into physicochemical properties of Nd2CuO4±δ and the A-site cation deficient Nd1.9CuO4±δ layered oxides

2020 ◽  
Vol 13 (06) ◽  
pp. 2051034
Author(s):  
Bartłomiej Gȩdziorowski ◽  
Anna Niemczyk ◽  
Anna Olszewska ◽  
Kacper Cichy ◽  
Konrad Świerczek
Keyword(s):  
Crystal Structure ◽  
Electrical Conductivity ◽  
Physicochemical Properties ◽  
Oxygen Vacancies ◽  
Numerical Density ◽  
Interstitial Oxygen ◽  
Layered Oxides ◽  
Oxygen Defects ◽  
A Site ◽  
Insight Into

Nd2CuO[Formula: see text] is known to possess either oxygen vacancies or interstitial oxygen defects, depending on the synthesis route, as well as may exhibit the A-site deficiency. In this work, insight into physicochemical properties of Nd2CuO[Formula: see text] and Nd[Formula: see text]CuO[Formula: see text] layered oxides is given, focusing on the crystal structure, electrical conductivity, and oxygen permeation, as well as on numerical density functional theory (DFT) simulations concerning ionic defects formation and their possible movement in the crystal structure. The results indicate that in oxidizing conditions at low temperatures, interstitial oxygen defects are stable, but with the increase of temperature, the release of oxygen is observed, leading to formation of the oxygen vacancies. Both materials are stable at elevated temperatures in air and Ar. Larger oxygen nonstoichiometry and improved electrical conductivity at high temperatures for Nd[Formula: see text]CuO[Formula: see text] compound are accompanied by the recorded oxygen flux of ca. 0.2[Formula: see text]mL[Formula: see text]cm[Formula: see text][Formula: see text]min[Formula: see text] at 880∘C for 0.8[Formula: see text]mm thick ceramic membrane.

Crystal Structure and Magnetic Properties of A-Site Substituted Nd1-xPrxBaMn2O6 Double Manganite

2020 ◽  
Vol 33 (6) ◽  
pp. 1899-1903
Author(s):  
Svetlana G. Titova ◽  
Evgenii V. Sterkhov ◽  
Sergey A. Uporov
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
A Site

Crystal structure and magnetic properties of A-site-ordered quadruple perovskite CeCu3Cr4O12

2019 ◽  
Vol 793 ◽  
pp. 42-48 ◽  
Author(s):  
Alexei A. Belik ◽  
Yoshio Katsuya ◽  
Masahiko Tanaka ◽  
Kazunari Yamaura
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
A Site

scholarly journals Structure, optical and magnetic properties of new Bi0.5Na0.5TiO3- SrMnO3−δ solid solution materials

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Dang Duc Dung ◽  
Nguyen The Hung ◽  
Dorj Odkhuu
Keyword(s):  
Solid Solution ◽  
Magnetic Properties ◽  
Room Temperature ◽  
Optical Band Gap ◽  
Electronic Devices ◽  
Sol Gel ◽  
Weak Ferromagnetism ◽  
Host Lattice ◽  
Ferroelectric Materials ◽  
Optical And Magnetic Properties

AbstractThe new Bi0.5Na0.5TiO3-SrMnO3−δ solid solution materials were fabricated via sol–gel method. The random incorporation of Sr and Mn cations into host lattice of Bi0.5Na0.5TiO3 resulted in structural distortion and influenced on the reduction of the optical band gap from 3.07 eV to 1.81 eV for pure Bi0.5Na0.5TiO3 and 9 mol% SrMnO3−δ solid solution into Bi0.5Na0.5TiO3. The magnetic properties of Bi0.5Na0.5TiO3 materials at room temperature were tuned via compensation of diamagnetic material with weak-ferromagnetism to ferromagnetism with low SrMnO3−δ content and combination of paramagnetism/antiferromagnetism-like and ferromagnetism with higher SrMnO3−δ content solid solution in Bi0.5Na0.5TiO3. The tunable magnetic and optical properties of lead-free ferroelectric materials was promising for their application to green electronic devices.

scholarly journals Structural, magnetic behaviors and temperature-dependent Raman scattering spectra of Y and Zr codoped BiFeO3 ceramics

2015 ◽  
Vol 05 (03) ◽  
pp. 1550025 ◽  
Author(s):  
Cheng Zhang ◽  
Dan Xie ◽  
Jianlong Xu ◽  
Yilin Sun ◽  
Yongyuan Zang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Spin Structure ◽  
X Ray Diffraction ◽  
Phonon Modes ◽  
Temperature Dependent ◽  
X Ray ◽  
Raman Modes ◽  
Scattering Spectra ◽  
Raman Scattering Spectra ◽  
Spiral Spin

Multiferroic [Formula: see text] (BFO) and Y, Zr codoped BFO [Formula: see text] ceramics were prepared and the influence of codoping on the crystal structure and magnetic properties were investigated in this work. Confirmed by the evolution of X-ray diffraction and Raman modes, the codoping has changed the crystal structure from rhombohedral to tetragonal in bulk BFO ceramics. The enhancement of magnetic behaviors is demonstrated by the damage of space-modulated spiral spin structure, and it can be attributed to the crystal structure change and size effects. Meanwhile, Raman spectra from 300 to 800 K demonstrates that lower frequency phonon modes show rapid softening near the Neel temperature.

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