scholarly journals EPR, Nexafs Study and Magnetic Properties of Fe-Doped Ferroelectric Ceramics

2018 ◽  
Vol 57 (1) ◽  
pp. 35-41 ◽  
Author(s):  
N. A. Zhuk ◽  
V. P. Lutoev ◽  
B. A. Makeev ◽  
N. V. Chezhina ◽  
V. A. Belyy ◽  
...  
Keyword(s):  
Solid Solution ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Solid Solutions ◽  
Esr Spectra ◽  
Ferroelectric Ceramics ◽  
Layered Perovskite ◽  
Nexafs Spectroscopy ◽  
Ferromagnetic Exchange ◽  
Rhombic Distortion

Abstract Magnetic susceptibility and EPR of iron-containing solid solutions with layered perovskite-like structure Bi2BaNb2-2xFe2xO9-δ and Bi5Nb3-3xFe3xO15-δ have been studied. The solid solutions Bi2BaNb2-2xFe2xO9-δ as well as iron oxides FeO, Fe2O3, and Fe3O4 were studied by the NEXAFS spectroscopy. The formation of exchange-bound aggregates of Fe(III) atoms with antiferroand ferromagnetic exchange types has been found in the solid solutions. In the ESR spectra of the solid solution samples, the lines with g ≈ 2.0 and g = 4.27 having a weak shoulder at g ~ 8 were attributed to Fe(III) atoms in the octahedral field with strong rhombic distortion.

scholarly journals FABRICATION AND PROPERTIES OF Co DOPED Bi0.5K0.5TiO3 – BiFeO3 SOLID SOLUTION

2018 ◽  
Vol 56 (1A) ◽  
pp. 197
Author(s):  
Nguyen Hoang Tuan
Keyword(s):  
Solid Solution ◽  
Raman Spectroscopy ◽  
Magnetic Properties ◽  
Crystal Structures ◽  
Solid Solutions ◽  
Sol Gel ◽  
Structure And Properties ◽  
Antiferromagnetic Ordering ◽  
Co Doped ◽  
Good Agreement

In this study, we present some results on the structure and properties of the solid solution of Bi0.5K0.5TiO3– BiFeCoO3 (BKT – BFCO) by Sol-gel method. Crystal structures of BKT – BFCO solid solutions were studies by XRD and Raman spectroscopy. The results were in good agreement with the previous reports of Bi0.5K0.5TiO3– BiFeO3 (BKT – BFO) and Bi0.5K0.5TiO3 – BiCoO3 (BKT – BCO) solid solutions. The magnetic properties were investigated via unsaturated M-H loop, which showed the competition of paramagnetic and antiferromagnetic ordering in BKT – BFCO. However, differing from the BKT – BFO and BKT – BCO solid solutions, the unclear values of saturated magnetism in BKT – BFCO raised the unexplained question, which needed further studies.

scholarly journals NEXAFS–Spectra and Magnetic Susceptibility of Nickel and Chromium Doped of Bismuth Niobate

2020 ◽  
pp. 340-348
Author(s):  
Irina E. Vasilyeva ◽  
Sergey V. Nekipelov ◽  
Boris A. Makeev ◽  
Alexey G. Krasnov ◽  
Nadezhda A. Zhuk
Keyword(s):  
Magnetic Susceptibility ◽  
Charge State ◽  
Electronic State ◽  
High Spin ◽  
Solid Solutions ◽  
Exchange Interactions ◽  
High Spin State ◽  
Chromium Oxides ◽  
X Ray ◽  
Nexafs Spectroscopy

The electronic state and character of exchange interactions of nickel and chromium atoms in solid solutions of Bi5Nb3-3xМ3xO15-δ (М-Cr,Ni) was researched by methods of magnetic susceptibility and NEXAFS-spectroscopy. NEXAFS spectra of nickel and chromium oxides were obtained. According to X-ray spectroscopy in solid solutions, chromium atoms are mainly in the charge state of Cr(III), and nickel atoms in the high-spin state of Ni(II) in octahedral coordination. In solid solutions, paramagnetic chromium and nickel atoms are present in the form of monomers and clusters with a common antiferromagnetic type of exchange

Thermal and magnetic properties of dilute solid solutions

1965 ◽  
Vol 285 (1403) ◽  
pp. 461-469 ◽  
Keyword(s):  
Solid Solution ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Green Function ◽  
Function Method ◽  
Narrow Band ◽  
Green Function Method ◽  
Dilute Alloys ◽  
Unit Energy ◽  
The Green Function

The number of states per unit energy, for an electron moving in the aperiodic field of a dilute solid solution, is calculated by the Green function method. It is shown that the effect of scattering in a narrow band is to reduce the density of states at the Fermi limit. The thermal and magnetic properties of dilute alloys are therefore influenced by two effects: electron concentration and scattering. The results are applied to dilute solutions of Ag, Rh and Ru in palladium. An explanation is given of the observation that Ru decreases the magnetic susceptibility although Ru increases it in spite of the fact that both metals have negative valency relative to palladium.

Drastic Decrease of the Curie Temperature in the Solid Solution GdRuxCd1–x

2009 ◽  
Vol 64 (3) ◽  
pp. 356-360 ◽  
Author(s):  
Frank Tappe ◽  
Falko M. Schappacher ◽  
Wilfried Hermes ◽  
Matthias Eul ◽  
Rainer Pöttgen
Keyword(s):  
Solid Solution ◽  
Magnetic Properties ◽  
Curie Temperature ◽  
Powder Diffraction ◽  
Solid Solutions ◽  
Induction Melting ◽  
Powder Diffraction Data ◽  
X Ray ◽  
Drastic Effect ◽  
Cscl Structure

Five samples of solid solutions GdRuxCd1−x extending up to x ≈ 0.25 were synthesized by induction-melting of the elements in sealed tantalum tubes. According to X-ray powder diffraction data, the GdRuxCd1−x samples crystallize with the cubic CsCl structure. The structures of two crystals were refined from diffractometer data: Pm3̄m, a = 372.41(4) pm, wR2 = 0.0363, 45 F2, 5 variables for GdRu0.10(1)Cd0.90(1) and a = 367.70(4) pm, wR2 = 0.0301, 39 F2, 5 variables for GdRu0.20(1)Cd0.80(1). The cadmium-ruthenium substitution has a drastic effect on the magnetic properties. All samples order ferromagnetically, however, the Curie temperature decreases drastically from 258 K for GdCd to 63.6 K for GdRu0.20Cd0.80 with a Vegard-type behavior.

Doping Strategies of Bi (Ti0.5Ni0.5)O3 for Increased Performance in BiFeO3

2014 ◽  
Vol 1004-1005 ◽  
pp. 358-361
Author(s):  
Zheng Zheng Ma ◽  
Jian Qing Li ◽  
Zi Peng Chen ◽  
Xiao Jun Hu
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Magnetic Properties ◽  
Solid Solutions ◽  
Perovskite Structure ◽  
Room Temperature ◽  
Ferroelectric Properties ◽  
Hysteresis Loops ◽  
Space Group ◽  
Substituted 1

Investigation of crystal structure, dielectric, magnetic and local ferroelectric properties of the diamagnetically substituted (1-x)BiFeO3-xBi (Ti0.5Ni0.5)O3solid solutions samples have been carried out. The solid solutions have been found to possess a rhombohedrally distorted perovskite structure described by the space group R3c. Compared with pure BiFeO3compound, both ferroelectric and magnetic properties are much improved by solid solution with Bi (Ti0.5Ni0.5)O3with saturation hysteresis loops observed. Among all the samples, thex=0.1 samples shows the optimal ferromagnetism with Mr~0.56531emμ/g and the optimal ferroelectricity with Pr~5.767μC/cm2 at room temperature.

Chlorine nuclear quadrupole resonance studies of K2IrCl6-K2PtCl6 solid solutions

1971 ◽  
Vol 24 (7) ◽  
pp. 1325 ◽  
Author(s):  
JE Fergusson ◽  
DE Scaife
Keyword(s):  
Solid Solution ◽  
Magnetic Susceptibility ◽  
Solid Solutions ◽  
Solution System ◽  
Chlorine Atoms ◽  
Cubic Lattice ◽  
Solid Solution System ◽  
Quadrupole Resonance ◽  
Pure Compounds ◽  
Nuclear Quadrupole

The cubic lattice parameters for the solid solution system K2IrCl6- K2PtCl6 vary approximately linearly with composition from a0 = 9.765�0.001 Ǻ for K2,IrCl6, to a0 = 9.748�0.001 Ǻ for K2PtCl6. The 35Cl n.q.r, frequencies show shifts from the frequencies observed in the pure compounds, these shifts being approximately linear with composition at each of the temperatures 77�K, 201�K, and 298�K. The shifts in frequency on going from 0-100% Pt are, for the chlorine atoms bonded to the iridium, +93 kHz, and for the chlorine atoms bonded to the platinum, +84 kHz. ��� The infrared stretching frequencies of the MCl62- groups also show shifts which are approximately linear with composition. The extrapolated shifts in going from 0-100% Pt are +11 cm-1 and +4.5 cm-1 for the Pt-Cl and Ir-Cl stretching frequencies, respectively. The n.q.r. and infrared results are best accounted for by small changes in the M-Cl bond lengths within the MCl62- group, with concurrent changes in a0, and possibly also in the positional parameter u. Re-examination of the variation of magnetic susceptibility with composition in the K2IrCl6-K2PtCl6 system is also reported, and reasons proposed for the form of this variation. ��� 35Cl n.q.r. frequencies are reported for Cs2IrCl6.

scholarly journals Solid-solution (alloying) strategies in molecular conductors

2021 ◽  
Author(s):  
Marc Fourmigué
Keyword(s):  
Solid Solution ◽  
Magnetic Properties ◽  
Solid Solutions ◽  
Molecular Conductors ◽  
Metal Insulator

In this review, we describe solid solutions strategies employed in molecular conductors, where the control of the transport and magnetic properties (metallic or superconducting behavior, metal-insulator transitions, etc) is the...

scholarly journals Поведение кобальтовой и редкоземельной подсистем в фрустрированных кобальтитах DyBaCo-=SUB=-4-=/SUB=-O-=SUB=-7+x-=/SUB=-

2019 ◽  
Vol 61 (1) ◽  
pp. 71
Author(s):  
З.А. Казей ◽  
В.В. Снегирев ◽  
М.С. Столяренко ◽  
К.С. Пигальский ◽  
Л.П. Козеева ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Effective Field ◽  
Oxygen Nonstoichiometry ◽  
Structural Distortions ◽  
Rhombic Distortion ◽  
Order Of Magnitude ◽  
Oxygen Excess ◽  
Elastic Characteristics

AbstractStructural, elastic, and magnetic properties of cobaltites DyBaCo_4O_7 + _ x produced by various technologies and distinguished by oxygen excess x are experimentally studied. It was found that rhombic distortion of the crystal structure of annealed stoichiometric samples with x = 0 results in frustration removal and elastic property anomalies in the T _ N region, caused by cobalt subsystem ordering. At an insignificant oxygen nonstoichiometry, no structural distortions occur in quenched samples, and anomalies in elastic characteristics in the T _ N region smooth and disappear. The studies of DyBaCo_4O_7 + _ x magnetic properties show that the rare-earth (RE) subsystem remains paramagnetic and its contribution exceeds the contribution of the Co-subsystem with strong antiferromagnetic couplings by an order of magnitude. The magnetic susceptibility of the stoichiometric sample does not exhibit an appreciable anomaly at T _ N , since cobalt subsystem ordering is not accompanied by the formation of a noticeable effective field on RE ions.

MAGNETIC PROPERTIES OF Ti-Co SOLID SOLUTIONS

1999 ◽  
Vol 13 (08) ◽  
pp. 233-238
Author(s):  
IULIU POP ◽  
OLIVIA POP
Keyword(s):  
Phase Diagram ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Critical Temperature ◽  
Fermi Level ◽  
Solid Solutions ◽  
Magnetic Phase ◽  
Magnetic Phase Diagram ◽  
Main Mechanism ◽  
Thermal Variation

Thermal variation of the magnetic susceptibility for Ti-Co solid solutions is reported. Cobalt, by alloying acts on the transition Néel temperature giving rise to a complicated magnetic phase diagram. The change of the Fermi level is the main mechanism in the critical temperature, T N , shift.

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