scholarly journals Crystal structure and magnetic characteristics of solid solutions Ni1–xCrxMnSb

2021 ◽  
Vol 66 (3) ◽  
pp. 263-269
Author(s):  
G. S. Rimskiy ◽  
K. I. Yanushkevich ◽  
A. V. Rutkauskas
Keyword(s):  
Crystal Structure ◽  
Phase Transformation ◽  
Curie Temperature ◽  
Solid Solutions ◽  
Magnetic Order ◽  
Solid Phase ◽  
Magnetic Characteristics ◽  
Specific Magnetization ◽  
Magnetic Studies ◽  
Magnetic Disorder

The results of an experiment on studying the features of the crystal structure and magnetic studies of substitutional solid solutions of the Ni1–xCrxMnSb system (0 m х m 0.2) are presented. It was found that an increase in the concentration of chromium in solid solutions does not lead to significant changes in the size of the unit crystal cell. It was found that solid-phase quenching can be used to expand the limit of chromium solubility in Ni1–xCrxMnSb solid solutions. The temperature and field dependences of the specific magnetization of the synthesized compositions have been studied. It was found that the substitution of chromium for nickel in the NiMnSb compound leads to a decrease in the temperature of the “magnetic order – magnetic disorder” phase transformation with an increase in the concentration x from 0 to 20 mol.%. The values of specific magnetization and Curie temperature of hardened hard rasters are higher than those of slowly cooled ones. The results obtained contribute to the creation of a physical basis for the elemental base of spintronics.

scholarly journals Кристаллическая структура и магнитные характеристики твердых растворов Mn-=SUB=-1-x-=/SUB=-Fe-=SUB=-x-=/SUB=-NiGe

2021 ◽  
Vol 63 (3) ◽  
pp. 393
Author(s):  
Г.С. Римский ◽  
К.И. Янушкевич ◽  
Н.М. Белозорева ◽  
Д.П. Козленко ◽  
А.В. Руткаускас
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Phase Transformation ◽  
Neutron Diffraction ◽  
Magnetic Order ◽  
Hexagonal Structure ◽  
Orthorhombic Structure ◽  
X Ray ◽  
Temperature Range ◽  
Magnetic Disorder

Substitutional solid solutions Mn1-xFexNiGe (0.05≤x≤1.00) were synthesized. The crystal structure in the temperature range of 20 - 300 K has been studied by X-ray and neutron diffraction. At T = 200 K, a phase transformation from a hexagonal structure of the Ni2In type to an orthorhombic structure (S.G. Pnma) has been observed. The magnetic properties of these compounds were also investigated in the temperature range of 5 - 300 K and external magnetic fields up to 10 T. The temperature of the "magnetic order - magnetic disorder" phase transformation was found to decrease from 272 to 132 K with an increase in concentration x from 5 to 30 mol%.

Effect of Sintering Temperatures and Ba/Ti Ratio on Dielectric Properties of BaTiO3 Ceramic

2013 ◽  
Vol 750-752 ◽  
pp. 506-511
Author(s):  
Yuan Yuan Li ◽  
Gui Xia Dong ◽  
Bi Yan Zhu ◽  
Qiu Xiang Liu ◽  
Di Wu
Keyword(s):  
Crystal Structure ◽  
Dielectric Properties ◽  
Curie Temperature ◽  
Sintering Temperature ◽  
Solid Phase ◽  
Solid Phase Reaction ◽  
Phase Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Method Effect

As a research object, the samples with various Ba/Ti ratios (Ba/Ti=0.95~1.05) were synthesized by solid phase reaction method. Effect of sintering temperatures and Ba/Ti ratio on dielectric properties and crystal structure of BaTiO3ceramic were investigated. Crystal structure and crystal phase composition were investigated by scanning electron microscopy and X-ray diffraction. The dielectric properties were studied by Agilent 4294A at 1 kHz. The results show that the BaTiO3ceramic has high permittivity and dielectric loss at 1340°C. The permittivity of BaTiO3ceramic with Ba/Ti=0.95 change small as the sintering temperatures vary at 1320°C. With the increasing of Ba/Ti ratio, the Curie temperature first increases and then decreases as the sample sintering at 1320°C. When Ba/Ti=1, the Curie temperature increase with the sintering temperature increasing.

scholarly journals Влияние атомов замещения и внедрения на магнитные свойства соединения Sm-=SUB=-2-=/SUB=-Fe-=SUB=-17-=/SUB=-

2021 ◽  
Vol 47 (12) ◽  
pp. 6
Author(s):  
С.В. Веселова ◽  
И.С. Терёшина ◽  
В.Н. Вербецкий ◽  
К.В. Захаров ◽  
В.Б. Тверской ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Curie Temperature ◽  
Saturation Magnetization ◽  
Room Temperature ◽  
Magnetic Hysteresis ◽  
Inert Gas ◽  
Magnetic Characteristics ◽  
Induction Melting ◽  
Gas Atmosphere ◽  
Hysteresis Properties

(Sm1-xRx)2Fe17 (R = Ho, Er) alloys with х = 0.1, 0.2 and 0.4 were prepared by induction melting under inert gas atmosphere. The structure and magnetic hysteresis properties of both the initial compositions and hydrides based on them are investigated. It was found that (Sm1-xRx)2Fe17Нy hydrides like the parent compounds have a rhombohedral Th2Zn17-type of crystal structure (sp.gr. R m). Hydrogenation results in a significant increase in the Curie temperature and saturation magnetization at room temperature. Compositions with potentially high magnetic characteristics have been determined.

Crystal Structure and Magnetic Characteristics of Solid Solutions Mn1 – xFexNiGe

2021 ◽  
Vol 63 (3) ◽  
pp. 485-491
Author(s):  
G. S. Rimskii ◽  
K. I. Yanushkevich ◽  
N. M. Belozerova ◽  
D. P. Kozlenko ◽  
A. V. Rutkauskas
Keyword(s):  
Crystal Structure ◽  
Solid Solutions ◽  
Magnetic Characteristics

scholarly journals Derived crystal structure of martensitic materials by solid–solid phase transformation

2020 ◽  
Vol 76 (4) ◽  
pp. 521-533 ◽  
Author(s):  
Mostafa Karami ◽  
Nobumichi Tamura ◽  
Yong Yang ◽  
Xian Chen
Keyword(s):  
Crystal Structure ◽  
Phase Transformation ◽  
Orientation Relationship ◽  
Solid Phase ◽  
Lattice Parameters ◽  
Orthorhombic Symmetry ◽  
Face Centered Cubic ◽  
X Ray ◽  
Solid Phase Transformation ◽  
Martensitic Materials

A mathematical description of crystal structure is proposed consisting of two parts: the underlying translational periodicity and the distinct atomic positions up to the symmetry operations in the unit cell, consistent with the International Tables for Crystallography. By the Cauchy–Born hypothesis, such a description can be integrated with the theory of continuum mechanics to calculate a derived crystal structure produced by solid–solid phase transformation. In addition, the expressions for the orientation relationship between the parent lattice and the derived lattice are generalized. The derived structure rationalizes the lattice parameters and the general equivalent atomic positions that assist the indexing process of X-ray diffraction analysis for low-symmetry martensitic materials undergoing phase transformation. The analysis is demonstrated in a CuAlMn shape memory alloy. From its austenite phase (L21 face-centered cubic structure), it is identified that the derived martensitic structure has orthorhombic symmetry Pmmn with the derived lattice parameters a d = 4.36491, b d = 5.40865 and c d = 4.2402 Å, by which the complicated X-ray Laue diffraction pattern can be well indexed, and the orientation relationship can be verified.

SOLID SOLUTIONS OF HYDROGEN PEROXIDE AND WATER

1940 ◽  
Vol 18b (2) ◽  
pp. 66-73 ◽  
Author(s):  
P. A. Giguère ◽  
O. Maass
Keyword(s):  
Crystal Structure ◽  
Hydrogen Peroxide ◽  
Experimental Method ◽  
Solid Solutions ◽  
Mother Liquor ◽  
Solid Phase ◽  
Complete Removal ◽  
Special Care ◽  
Ample Evidence

An attempt has been made to determine the exact composition of the first crystals that separate out on freezing solutions of hydrogen peroxide and water of various concentrations. Special care was taken to ensure complete removal of any liquid wetting the solid phase. In all cases the crystals were found to contain both components and in proportions usually different from those in the mother-liquor. Owing to the limitations of the experimental method used, the results are only approximate, but they afford ample evidence for the existence of solid solutions. The possibility of hydrogen peroxide forming solid solutions with water is discussed from the standpoint of the crystal structure of both components.

Heat capacities and enthalpies of fusion and transformation for solvates of some salts with dimethyl sulfoxide and dimethylformamide

1988 ◽  
Vol 53 (12) ◽  
pp. 3072-3079
Author(s):  
Mojmír Skokánek ◽  
Ivo Sláma
Keyword(s):  
Heat Capacity ◽  
Phase Transformation ◽  
Phase Transformations ◽  
Dimethyl Sulfoxide ◽  
Liquidus Temperature ◽  
Molar Heat Capacity ◽  
Solid Phase ◽  
Zinc Nitrate ◽  
Heat Capacities ◽  
Liquid Phases

Molar heat capacities and molar enthalpies of fusion of the solvates Zn(NO3)2 . 2·24 DMSO, Zn(NO3)2 . 8·11 DMSO, Zn(NO3)2 . 6 DMSO, NaNO3 . 2·85 DMSO, and AgNO3 . DMF, where DMSO is dimethyl sulfoxide and DMF is dimethylformamide, have been determined over the temperature range 240 to 400 K. Endothermic peaks found for the zinc nitrate solvates below the liquidus temperature have been ascribed to solid phase transformations. The molar enthalpies of the solid phase transformations are close to 5 kJ mol-1 for all zinc nitrate solvates investigated. The dependence of the molar heat capacity on the temperature outside the phase transformation region can be described by a linear equation for both the solid and liquid phases.

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