scholarly journals Magnetic Susceptibility and EPR Study of Bi₅Nb₃−₃ₓCo₃ₓO₁₅−δ

2020 ◽  
pp. 342-349 ◽  
Author(s):  
Nadezhda A. Zhuk ◽  
Vladimir P. Lutoev ◽  
Dmitriy S. Beznosikov ◽  
Andrey N. Nizovtsev ◽  
Lubov V. Rychkova
Keyword(s):  
Magnetic Susceptibility ◽  
Solid Solutions ◽  
Cobalt Content ◽  
Unit Cell ◽  
Layered Perovskite ◽  
Antiferromagnetic Exchange ◽  
Cobalt Ions ◽  
Monoclinic Distortion

Magnetic susceptibility, microstructure and EPR of cobalt-containing solid solutions with layered perovskite-like structure Bi5Nb3−3xCo3xO15−δ have been studied. Solid solutions of Bi5Nb3−3xCo3xO15−δ (x60.005) can be crystallized in tetragonal syngony (sp. gr. P4/mmm), as cobalt content increases, monoclinic distortion of the unit cell emerges at 0.005 < x 6 0.04 (sp. gr. P2/m). The formation of exchange-bound aggregates of Сo(III) and Co(II) atoms predominantly with antiferromagnetic exchange types has been found in the solid solutions. EPR indirectly confirms that cobalt ions are in octahedral positions of substitution of Nb(V) ions

Structural, Electrical and Magnetic Properties of Pb2Mg1-xCoxWO6 Solid Solutions

2003 ◽  
Vol 17 (20n21) ◽  
pp. 1135-1141 ◽  
Author(s):  
I. Ardelean ◽  
I. Barbur ◽  
V. Timar ◽  
Gh. Borodi
Keyword(s):  
Solid Solutions ◽  
Magnetic Measurements ◽  
Cobalt Content ◽  
Magnetic Interactions ◽  
Magnetic Data ◽  
X Ray Diffraction ◽  
Cobalt Ions ◽  
Electrical And Magnetic Properties ◽  
Cobalt Substitution ◽  
Diffraction Patterns

X-ray diffraction, electrical and magnetic measurements performed on Pb 2 Mg 1-x Co x WO 6 solid solutions with 0≤x≤1 are reported. By cobalt substitution for magnesium the diffraction patterns indicate the transition from orthorhombic structure characteristics for Pb 2 MgWO 6 to the cubic structure specific for Pb 2 CoWO 6. The Curie temperature decreases with cobalt content from 38°C to 32°C. The magnetic data indicate that the cobalt ions are in a bivalent state and, for x>0.1, experience negative magnetic interactions.

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 Unit cell dimensions of some synthetic olivine group solid solutions

1968 ◽  
Vol 2 (1) ◽  
pp. 51-59 ◽  
Author(s):  
Yoshito Matsui ◽  
Yasuhiko Syono
Keyword(s):  
Solid Solutions ◽  
Unit Cell ◽  
Cell Dimensions ◽  
Unit Cell Dimensions

scholarly journals Manganese Fluorene Phosphonates: Formation of Isolated Chains

Inorganics ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 92 ◽  
Author(s):  
Clarisse Bloyet ◽  
Jean-Michel Rueff ◽  
Vincent Caignaert ◽  
Bernard Raveau ◽  
Jean-François Lohier ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Hydrogen Bonds ◽  
Phosphonic Acid ◽  
Van Der Waals ◽  
Exchange Interactions ◽  
Van Der Waals Interactions ◽  
Antiferromagnetic Exchange ◽  
Hydrothermal Conditions ◽  
Hirshfeld Surfaces ◽  
Nitrate Tetrahydrate

9,9-dimethylfluorenyl-2-phosphonic acid 1 was reacted with manganese nitrate tetrahydrate to produce under hydrothermal conditions the crystalline manganese phosphonate Mn(H2O)2[O2(OH)PC15H13]2·2H2O which crystallize in the P21/c space group. This compound is a rare example of Mn-phosphonate material featuring isolated chains. The interactions between these chains containing the 9,9-dimethylfluorenyl moieties, result from Van der Waals interactions involving the fluorene ligands and C···H–C hydrogen bonds as revealed by Hirshfeld Surfaces. This material features antiferromagnetic exchange interactions as revealed by the magnetic susceptibility as a function of the temperature.

scholarly journals Температурные зависимости электропроводности и магнитной восприимчивости кристаллов твердых растворов Sb-=SUB=-2-=/SUB=-Te-=SUB=-3-=/SUB=--Bi-=SUB=-2-=/SUB=-Te-=SUB=-3-=/SUB=-

2021 ◽  
Vol 55 (12) ◽  
pp. 1162
Author(s):  
Н.П. Степанов ◽  
В.Ю. Наливкин ◽  
А.К. Гильфанов ◽  
А.А. Калашников ◽  
Е.Н. Трубицына
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Susceptibility ◽  
Solid Solutions ◽  
Thermoelectric Materials ◽  
Materials Science ◽  
Practical Importance ◽  
Experimental Studies ◽  
Electronic System ◽  
Temperature Dependences ◽  
The Subject

Solid solutions Bi2Te3-Sb2Te3 continue to be the subject of numerous and versatile experimental studies due to their practical importance for thermoelectric materials science. In this regard, the problem of studying the regularities of changes in the state of the electronic system of these semiconductors from composition and temperature remains urgent. This paper presents the results of studying the temperature dependences of the magnetic susceptibility of Bi2Te3-Sb2Te3 crystals containing 10, 25, 40, 50, 60 mol. % Sb2Te3. The correlation of the behavior of the temperature dependences of the magnetic susceptibility and electrical conductivity is analyzed.

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

Structure and properties of solid solutions in the Mg-Al-B system

Open Physics ◽  
2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Ludmila Sevastyanova ◽  
Olga Gulish ◽  
Vladimir Stupnikov ◽  
Vladimir Genchel ◽  
Oleg Kravchenko ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Unit Cell ◽  
Superconducting Transition ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
Resistivity Measurements ◽  
Ceramic Synthesis

AbstractCompounds with the general formula Mg1−x AlxB2 were obtained by two-step ceramic synthesis. All compounds were characterized by X-ray diffraction, NMR spectroscopy, and by four point probe resistivity measurements in various magnetic fields method. The diborides unit cell parameters were determined as a function of the Al mole fraction. With the vaues of x up to 0.40 (where x is the composition of the stock prepared for sintering), the unit cell parameters of Mg1−x AlxB2 are similar to those of pure MgB2 and the superconducting transition temperature was lowered. For stock compositions of 0:25 ≤ x ≤ 0:60, the products contain a superstructure, also superconducting phase, which becomes the only product at x = 0:50, and at x > 0:60 this phase is replaced by AlB2-based solid solutions.

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