scholarly journals Correlating the lattice parameter and Curie temperature of γ-Ni in Fe-Ni-base alloys

AIP Advances ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 055126 ◽  
Author(s):  
K. S. Anand ◽  
D. Goswami ◽  
P. P. Jana ◽  
J. Das
Keyword(s):  
Curie Temperature ◽  
Lattice Parameter

The Solid Solutions Gd2Cu2In1–xMgx – Drastic Increase of the Curie Temperature upon In/Mg Substitution

2010 ◽  
Vol 65 (12) ◽  
pp. 1516-1520 ◽  
Author(s):  
Wilfried Hermes ◽  
Falko M. Schappacher ◽  
Rainer Pöttgen
Keyword(s):  
Curie Temperature ◽  
Intermetallic Compounds ◽  
Solid Solutions ◽  
Temperature Increase ◽  
Magnesium Content ◽  
Lattice Parameter ◽  
Weiss Constant ◽  
Drastic Increase ◽  
Complete Set ◽  
Mg Substitution

The Mo2B2Fe-type intermetallic compounds Gd2Cu2In and Gd2Cu2Mg form a complete set of solid solutions Gd2Cu2In1−xMgx. The a lattice parameter, the Weiss constant and the Curie temperature increase with increasing magnesium content in an almost Vegard-like manner, while the c parameter remains almost constant. All members of the solid solutions show ferromagnetism with TCs between 114 and 80 K.

Transmission Electron Microscopy Study of Mod Plzt and Pnzt Thin Films

1991 ◽  
Vol 243 ◽  
Author(s):  
Jhing–Fang Chang ◽  
Chi Kong Kwok ◽  
Seshu B. Desu
Keyword(s):  
Thin Films ◽  
Curie Temperature ◽  
Dopant Concentration ◽  
Microscopy Study ◽  
Lattice Parameter ◽  
Electron Microscopy Study ◽  
Bulk Materials ◽  
Thin Foils ◽  
Transmission Electron ◽  
Coating Method

AbstractBoth La and Nd–doped PZT, i.e., PLZT and PNZT, ferroelectric thin films were prepared by the metalorganic deposition (MOD) process. The precursor solutions used were derived from lead acetate, lanthanum acetylacetonate, neodymium acetate, zirconium n–propoxide, and titanium iso–propoxide. The dopant concentration of the films analyzed by electron microprobe indicated a one–to–one correspondence between film composition and the composition of the precursor from which the film was made. In this study, the effects of Nd and La dopants in PZT films on Curie temperature was determined by in–situ hot–stage TEM and compared with those of bulk materials. Lattice parameter and phase transformation were determined by both X–ray and electron diffraction. Our observations were: (1) Curie temperature decreases with increasing dopant concentration for both thin foils and bulk ceramics, (2) for a given dopant concentration, Curie temperature and crystal tetragonality of PNZT thin foils is lower than those of PLZT samples, (3) Curie temperature of thin foils was found to be less than those of the corresponding bulk materials, and (4) ferroelectric domains is easily observed in both PLZT and PNZT TEM specimens prepared by the spin–coating method.

Magnetic Studies of Ni3Al(Fe) Compounds

1984 ◽  
Vol 39 ◽  
Author(s):  
S. T. Sekula ◽  
H. R. Kerchner ◽  
J. R. Thompson ◽  
Th. Leventouri
Keyword(s):  
Curie Temperature ◽  
Magnetic Measurements ◽  
Lattice Parameter ◽  
Magnetic Studies ◽  
Fe Content ◽  
Magnetization Data ◽  
Ordered Intermetallic ◽  
Material Forming ◽  
Fcc Phase ◽  
Fe Impurities

ABSTRACTSeveral samples of the ordered intermetallic compound with the Ll2 structure and chemical composition NiO.75-xAl0.25-xFe2x (doped with 0.2 at. % B) have been studied over an Fe compositional range 0 ≤ 2x ≤ 0.20. Stoichiometric Ni3Al is known to be a strongly exchange-enhanced-material, forming a giant moment system when Fe impurities are introduced in trace amounts. For the greater Fe concentrations employed in this work, more conventional ferromagnetic systems are obtained. Well below the ferromagnetic Curie temperature Tc the samples exhibit a spontaneous moment in small magnetic fields and at higher fields the isothermal magnetization data show a clear tendency toward saturation. Magnetic investigations using vibrating-sample techniques permitted measurements over the temperature interval from 4.2 K to 800 K in fields up to 5.0 T. The Curie temperature was found to increase from ∼50 K for the Fe-free sample in the series to 410 K for the limiting concentration of 12 at. % Fe in the Ll2 structure. Samples with higher Fe content up to 20 at. % contain a second, disordered fcc phase with Tc ≃ 715 K. Peaks in the temperature dependence of the lattice parameter observed in x-ray studies yield Tc values in reasonable agreement with the magnetic measurements.

scholarly journals Effects Of Cd On Physical And Some Magnetic Properties Of Co-Cd Ferrites

1970 ◽  
Vol 35 (2) ◽  
pp. 229-235 ◽  
Author(s):  
Saroaut Noor ◽  
SS Sikder ◽  
M Samir Ullah ◽  
MA Hakim ◽  
Shireen Akhter
Keyword(s):  
Curie Temperature ◽  
Lattice Parameter ◽  
Initial Permeability ◽  
X Ray Diffraction ◽  
Ceramic Method ◽  
X Ray ◽  
Cobalt Ferrites ◽  
Vegard’S Law ◽  
Ray Density ◽  
Curie Temperature Tc

Polycrystalline samples of Cd substituted cobalt ferrites with composition Co1-xCdxFe2O4 (x = 0.0- 0.6 in steps of 0.1) were prepared by double sintering ceramic method. The samples were sintered at 1050°C for 3 hours. X-ray diffraction pattern of the samples showed single phase cubic spinel structure. It was found that the lattice parameter increases linearly with increasing Cd content following Vegard’s law. The apparent density and X-ray density exhibited similar behavior. The Curie temperature Tc has been determined from the temperature dependence of permeability. It was found that the Curie temperature continuously decreased with increasing Cd content and is attributed to the weakening of JAB exchange interaction. The initial permeability, μ' increases with increasing Cd content up to x = 0.6 and then decreases. Key words: Co-Cd ferrite; Lattice parameter; Permeability DOI: http://dx.doi.org/10.3329/jbas.v35i2.9429 JBAS 2011; 35(2): 229-235

scholarly journals Modified lattice parameter/Curie temperature diagrams for Titanomagnetite/titanomaghemite within the quadrilateral Fe3O4- Fe2TiO4-Fe2O3-Fe2TiO5

1996 ◽  
Vol 23 (20) ◽  
pp. 2811-2814 ◽  
Author(s):  
Weixin Xu ◽  
Donald R. Peacor ◽  
Rob Van der Voo ◽  
Wayne Dollase ◽  
Rick Beaubouef
Keyword(s):  
Curie Temperature ◽  
Lattice Parameter

Magnetic properties of (NixCu1−x)2MnSn

1977 ◽  
Vol 55 (17) ◽  
pp. 1481-1484 ◽  
Author(s):  
R. A. MacDonald ◽  
C. V. Stager
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Heusler Alloy ◽  
Room Temperature ◽  
Manganese Atom ◽  
Lattice Parameter ◽  
Alloy Series ◽  
Saturation Moment ◽  
Curie Temperatures

Magnetization and crystallographic measurements are reported for the Heusler alloy series (NixCu1−x)2MnSn. With the exception of Cu2MnSn and perhaps (Ni0.1Cu0.9)2MnSn all of the samples prepared had the cubic Heusler L21 structure at room temperature. The lattice parameter varies linearly as a function of composition. The saturation moment is constant at approximately 4μβ per manganese atom throughout the series. Curie temperatures vary smoothly but non-linearly with composition, providing some evidence for at least two competing mechanisms in the determination of the Curie temperature.

Effect of substitution of Ga on the structure and magnetic properties of Dy2Co17−xGax (0≤x≤7) compounds

2007 ◽  
Vol 22 (3) ◽  
pp. 223-226 ◽  
Author(s):  
Liu FuSheng ◽  
Ao WeiQin ◽  
Jian YongXi ◽  
Li JunQin
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Powder Diffraction ◽  
Unit Cell Volume ◽  
Lattice Parameter ◽  
Linear Increase ◽  
X Ray ◽  
Arc Melting ◽  
Gallium Content ◽  
Ga Content

A series of Dy2Co17−xGax polycrystalline samples with x from 0 to 7 were prepared by arc melting. X-ray powder diffraction analysis indicated that these compounds have the hexagonal Th2Ni17 structure for x≤3 and the rhombohedral Th2Zn17 structure for 3.5≤x≤7. The lattice parameters a and c increase linearly with the gallium content until x=5.3. With further increasing the gallium content x up to 7, the lattice parameter c slightly decreases, whereas the lattice parameter a increases more quickly than that for 0≤x≤5.3. The unit-cell volume shows an approximately linear increase of 6.1 Å3/Ga for 0≤x≤3.0 and 10.1 Å3/Ga for 3.5≤x≤7.0, respectively. Rietveld refinement of the Dy2Co11.7Ga5.3 compound reveals that the Ga atoms occupy all the 6c, 9d, 18f, and 18h sites and preferentially occupy the 6c site. The Curie temperature and the saturation magnetization of the rhombohedral Dy2Co17−xGax compounds decrease almost linearly with increasing Ga content.

Magnetostriction and Hysteresis of (Tb,Dy,Ho)Fe2 Alloys

2007 ◽  
Vol 546-549 ◽  
pp. 2205-2208 ◽  
Author(s):  
Hong Bo Zhang ◽  
Cheng Bao Jiang
Keyword(s):  
Magnetic Field ◽  
Curie Temperature ◽  
Magnetic Anisotropy ◽  
Lattice Parameter ◽  
Anisotropy Constant ◽  
Spin Reorientation ◽  
X Ray Diffraction ◽  
Diffraction Patterns ◽  
Low Magnetic Field ◽  
Operating Temperature Range

The Tb/Dy ratio of Tb0.30Dy0.70Fe1.95 giant magnetostrictive alloy was shifted away from 0.30/0.70 to 0.36/0.64 to enlarge the operating temperature range. However, the magnetostriction was reduced under low magnetic field and its hysteresis was enlarged with the shift of Tb/Dy ratio. Ho addition improves the magnetostriction under low magnetic field and reduces the hysteresis of TbxDyyHozFe1.95 (x+y+z=1). The crystal structure, lattice constant, Curie temperature, spin reorientation temperature, magnetization, magnetic anisotropy and magnetostriction of TbxDyyHozFe1.95 alloys were investigated. X-ray diffraction patterns demonstrate that all the samples possess MgCu2-type cubic Laves structure. The lattice parameter, Curie temperature and magnetic anisotropy constant K1 decreased with increasing Ho concentration. The hysteresis represented by the width of magnetostriction versus the applied field was reduced due to the addition of Ho. At a compressive stress of 10 MPa and a magnetic field of 1000Oe, the addition of Ho to the ternary TbxDyyFe1.95 compound reduced the width of magnetostriction by 25% for Tb0.296Dy0.472Ho0.232Fe1.95 and by 27% for Tb0.296Dy0.472Ho0.232Fe1.95 compared to the Tb0.36Dy0.64Fe1.95 alloy, while the strains were reduced by only 3% and 9%.

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