Magnetic and chemical ordering in the Heusler system Co2Mn1−xTixSn

1982 ◽  
Vol 60 (6) ◽  
pp. 909-914 ◽  
Author(s):  
R. A. Dunlap ◽  
G. Stroink
Keyword(s):  
Fourier Expansion ◽  
Heusler Alloys ◽  
Expansion Method ◽  
Magnetic Hyperfine ◽  
X Ray Diffraction ◽  
Hyperfine Fields ◽  
Magnetization Measurements ◽  
X Ray ◽  
Chemical Ordering ◽  
Mössbauer Measurements

119Sn Mössbauer effect, magnetization, and X-ray diffraction measurements have been made on the series of Heusler alloys CO2Mn1−xTixSn (0 ≤ x ≤ 1). The Mössbauer measurements are used to obtain the distribution of hyperfine fields by the Fourier expansion method of Window, This distribution is discussed in terms of the state of chemical ordering of the alloys, as indicated by the X-ray measurements. The magnetization measurements are compared with previous results by Webster and Sobezak, and are used to estimate the magnetic hyperfine fields as predicted by the Jena–Geldart theory.

Sn hyperfine field distributions in the Heusler alloys XMnSn and X2MnSn

1981 ◽  
Vol 59 (11) ◽  
pp. 1577-1584 ◽  
Author(s):  
R. A. Dunlap ◽  
R. H. March ◽  
G. Stroink
Keyword(s):  
Hyperfine Field ◽  
Fourier Expansion ◽  
Heusler Alloys ◽  
Expansion Method ◽  
Wide Distribution ◽  
Ordered Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Field Distributions ◽  
Hyperfine Field Distributions

The 119Sn hyperfine field in the Heusler alloys Ir1.07Mn1.07Sn0.86, PtMnSn, Ni2MnSn, Co2MnSn, and Pd2MnSn has been measured using the Mössbauer effect. Hyperfine field distributions were obtained from the Mössbauer spectra via the Fourier expansion method of Window. The spectra of Ni2MnSn, Co2MnSn, and Pd2MnSn showed a well-defined value of the hyperfine field. This indicates a well-ordered structure and is consistent with previous neutron diffraction and NMR measurements on these alloys. The Ir1.07Mn1.07Sn0.86 and PtMnSn spectra, on the other hand, showed a wide distribution of fields, indicating a considerable amount of disorder. The extent and type of disorder, as indicated by X-ray diffraction measurements, are also considered.

Structure, Magnetic Properties and Hyperfine Parameters of Nd-Substituted Ni-Fe-Ga Heusler Alloys

MRS Advances ◽  
2017 ◽  
Vol 2 (25) ◽  
pp. 1341-1346
Author(s):  
Monica Sorescu ◽  
Felicia Tolea ◽  
Mihaela Valeanu ◽  
Mihaela Sofronie
Keyword(s):  
Melt Spinning ◽  
Magnetic Measurements ◽  
Heusler Alloys ◽  
Hyperfine Magnetic Field ◽  
Rapid Quenching ◽  
Linear Least Squares ◽  
X Ray Diffraction ◽  
Hyperfine Parameters ◽  
X Ray ◽  
Field Distributions

ABSTRACTSamples of Ni57-xNdxFe18Ga25 with x=2 and 4 were prepared in ribbon form by rapid quenching via melt spinning route. The samples were analyzed by X-ray diffraction (XRD), magnetic measurements and Mössbauer spectroscopy, both in the as-quenched form and after thermal annealing at 900 oC for 2 min and 400 °C for 2 hours. For x=2 the Nd atoms are completely dissolved in the Ni-Fe-Ga matrix, while for x=4 the additional occurrence of the secondary 2:17 phase could be resolved. These findings were supported by the analysis of hyperfine magnetic field distributions obtained from the non-linear least-squares fitting of the Mössbauer spectra.

scholarly journals Martensitic Transformation and Crystalline Structure of Ni50Mn50−xSnx Melt-Spun Heusler Alloys

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 853
Author(s):  
Rim Ameur ◽  
Mahmoud Chemingui ◽  
Tarek Bachaga ◽  
Lluisa Escoda ◽  
Mohamed Khitouni ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Room Temperature ◽  
Solidification Rate ◽  
Heusler Alloys ◽  
X Ray Diffraction ◽  
Key Factors ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Characteristic Temperatures ◽  
Melt Spun

The structure and thermal behavior are key factors that influence the functional response of Ni–Mn–Sn alloys. The present study reports the production as well as the structure and thermal analysis of melt-spun (solidification rate: 40 ms−1) Ni50 Mn50−xSnx (x = 10, 11, 12 and 13 at.%) alloys. X-ray diffraction measurements were performed at room temperature. The austenite state has an L21 structure, whereas the structure of the martensite is 7M or 10M (depending on the Sn/Mn percentage). Furthermore, the structural martensitic transformation was detected by differential scanning calorimetry (DSC). As expected, upon increasing the Sn content, the characteristic temperatures also increase. The same tendency is detected in the thermodynamic parameters (entropy and enthalpy). The e/a control allows the development production of alloys with a transformation close to room temperature.

Effect of Li, Fe, and B Addition on the Crystallization Behavior of Sodium Aluminosilicate Glasses as Analogues for Hanford High Level Waste Glasses

MRS Advances ◽  
2016 ◽  
Vol 2 (10) ◽  
pp. 549-555 ◽  
Author(s):  
José Marcial ◽  
Mostafa Ahmadzadeh ◽  
John S. McCloy
Keyword(s):  
Function Analysis ◽  
High Level Waste ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Sodium ◽  
Chemical Ordering ◽  
Sodium Aluminosilicate ◽  
Aluminosilicate Glasses ◽  
Heat Treated ◽  
High Level

ABSTRACTCrystallization of aluminosilicates during the conversion of Hanford high-level waste (HLW) to glass is a function of the composition of the glass-forming melt. In high-sodium, high-aluminum waste streams, the crystallization of nepheline (NaAlSiO4) removes chemically durable glass-formers from the melt, leaving behind a residual melt that is enriched in less durable components, such as sodium and boron. We seek to further understand the effect of lithium, boron, and iron addition on the crystallization of model silicate glasses as analogues for the complex waste glass. Boron and iron behave as glass intermediates which allow for crystallization when present in low additions but frustrate crystallization in high additions. In this work, we seek to compare the average structures of quenched and heat treated glasses through Raman spectroscopy, X-ray diffraction, vibrating sample magnetometry, and X-ray pair distribution function analysis. The endmembers of this study are feldspathoid-like (LiAlSiO4, NaAlSiO4, NaBSiO4, and NaFeSiO4), pyroxene-like (LiAlSi2O6, NaAlSi2O6, NaBSi2O6, and NaFeSi2O6), and feldspar-like (LiAlSi3O8, NaAlSi3O8, NaBSi3O8, and NaFeSi3O8). Such a comparison will provide further insight on the complex relationship between the average chemical ordering and topology of glass on crystallization.

Magnetic hyperfine fields in the Heusler alloys Co2 YZ (Y=Sc, Ti, Hf, V, Nb; Z=Al, Ga, Si, Ge, Sn)

1993 ◽  
Vol 80 (1-4) ◽  
pp. 971-976 ◽  
Author(s):  
A. W. Carbonari ◽  
W. Pendl ◽  
R. N. Attili ◽  
R. N. Saxena
Keyword(s):  
Heusler Alloys ◽  
Magnetic Hyperfine ◽  
Hyperfine Fields

Magnetic and Transport Properties of Ag/Cr Metallic Superlattices

1991 ◽  
Vol 229 ◽  
Author(s):  
Kentaro Kyuno ◽  
Yasushi Inoue ◽  
Shinzo Ogu ◽  
Kazuki Mae ◽  
Takeo Kaneko ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Transport Properties ◽  
X Ray Diffraction ◽  
Magnetization Measurements ◽  
X Ray

AbstractThe results of x-ray diffraction, resistivity and magnetization measurements of Ag/Cr metallic superlattices are presented. Dramatic changes in the interplanar distances of Ag and Cr were found as a function of the number of Cr monolayers in a period. The resistivities of the superlattices increased as the composition of Cr increased. Magnetization measurements show that the superlattice [Ag(10ML)/Cr(2ML)] exibits a maximum magnetic susceptibility.

scholarly journals The new ternary silicides RE6Co1.67Si3 (RE=Ce, Nd, Gd, Tb, Dy) investigated by X-ray diffraction and magnetization measurements

2007 ◽  
Vol 442 (1-2) ◽  
pp. 149-151 ◽  
Author(s):  
B. Chevalier ◽  
E. Gaudin ◽  
F. Weill
Keyword(s):  
X Ray Diffraction ◽  
Magnetization Measurements ◽  
X Ray
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