Thermal equilibrium noise with 1/fspectrum and temperature‐dependent magnetic viscosity in the amorphous alloy DyNi

1994 ◽  
Vol 75 (10) ◽  
pp. 5634-5636 ◽  
Author(s):  
B. Barbara ◽  
A. Ratnam ◽  
A. Cavalleri ◽  
M. Cerdonio ◽  
S. Vitale
Keyword(s):  
Amorphous Alloy ◽  
Thermal Equilibrium ◽  
Temperature Dependent ◽  
Magnetic Viscosity

Kinetic paths of B2 and DO3 order parameters: Experiment

1989 ◽  
Vol 4 (5) ◽  
pp. 1140-1142 ◽  
Author(s):  
L. Anthony ◽  
B. Fultz
Keyword(s):  
Thermal Equilibrium ◽  
Nearest Neighbor ◽  
Order Parameters ◽  
Temperature Dependent ◽  
Critical Temperatures ◽  
Subsequent Evolution ◽  
X Ray ◽  
Rates Of Change ◽  
Temperature Dependences ◽  
Different Temperatures

Rapidly quenched powders of Fe3Al were subjected to thermal annealings at temperatures well below the critical temperatures for B2 and DO3 ordering. X-ray diffractometry was used to measure the subsequent evolution of B2 and DO3 long-range order. It was found that the relative rates of change of B2 and DO3 order parameters were temperature dependent; hence at different temperatures the alloy passed through different states of order en route to thermal equilibrium. These temperature dependences of “kinetic paths” can be understood in terms of a theory of kinetic paths based on the kinetic master equation. The theory indicates that the temperature dependence of the observed kinetic paths originates from having first-nearest-neighbor interactions that are stronger than second-nearest-neighbor interactions. This seems consistent with previous thermodynamic analyses of critical temperatures of Fe3Al.

Thermal field theory

2018 ◽  
Author(s):  
Michael Kachelriess
Keyword(s):  
Field Theory ◽  
Free Energy ◽  
Low Temperatures ◽  
Thermal Equilibrium ◽  
Statistical Physics ◽  
Thermal Field ◽  
Scalar Fields ◽  
Temperature Dependent ◽  
Scalar Particles ◽  
Debye Mass

After a review of the calculational approaches, the free energy of scalar particles in thermal equilibrium is calculated. The IR behaviour of mass-less scalar fields is examined, finding that a resummation of IR divergent terms is necessary. In general, particles acquire a temperature-dependent (Debye) mass, while symmetries of the Lagrangian may be hidden at low temperatures. In an appendix, the basics of equilibrium statistical physics is reviewe

The magnetic properties of the Tris(2-methyl-1,10-phenanthroline)iron(II) ion

1968 ◽  
Vol 21 (1) ◽  
pp. 83 ◽  
Author(s):  
HA Goodwin ◽  
RN Sylva
Keyword(s):  
Magnetic Properties ◽  
Thermal Equilibrium ◽  
Magnetic Moments ◽  
Anomalous Behaviour ◽  
Ligand Field ◽  
Temperature Dependent ◽  
Methyl Group ◽  
Temperature Range ◽  
Effective Strength

The magnetism of the salts [Fe mephen3]X2 (X = I-, ClO4-, BF4-, PF6-; mephen = 2-methyl- 1,l0-phenanthroline) has been investigated over the temperature range c. 100-300�K. The compounds exhibit anomalous behaviour, and this has been qualitatively interpreted as being the result of the presence of nearly equi-energetic ground terms 1A1 and 5T2 of the complexed iron(11) ion, a thermal equilibrium between these terms causing the magnetic moments to be markedly temperature dependent. This behaviour is apparently the result of the sterie hindrance to the coordination of an iron(11) ion induced by the presence of the methyl group in the ligand and the consequent lowering of the effective strength of the ligand field. The colour of the salts varies with temperature, and this has been discussed in terms of π-bonding between the iron(11) ion and the ligand.

Thio derivatives of β-diketones and their metal chelates. X. The anomalous paramagnetism of some iron(III) chelates of monothio-β-diketones

1968 ◽  
Vol 21 (8) ◽  
pp. 1987 ◽  
Author(s):  
RKY Ho ◽  
SE Livingstone
Keyword(s):  
Iron Atom ◽  
Thermal Equilibrium ◽  
Room Temperature ◽  
Magnetic Behaviour ◽  
The Other ◽  
Ligand Field ◽  
Pairing Energy ◽  
Temperature Dependent ◽  
Magnetic Susceptibilities ◽  
Derivatives Of

The magnetic susceptibilities of the iron(111) chelates Fe(R1CS=CHCOR2)3 (R1 = Ph, p-MeC6H4, p-MeOC6H4, p-BrC6H4, 2-thienyl, 2-furyl, R2 = CF3; R1 = Ph, R2 = Ph, OEt) have been investigated over a temperature range. The iron(111) complex of ethyl thiobenzoylacetate (R1 = Ph, R2 = OEt) is of the high-spin type and obeys the Curie-Weiss law with θ =-8�k. The moments of the other complexes vary between 2.31 and 6.61 B.M. at room temperature and are temperature-dependent, ranging from 1.86 to 4.07 B.M. at 80�k, depending on the nature of R1 and R2 This behaviour is postulated to be due to a thermal equilibrium between the nearly equi-energetic spin-paired (t5/2g) and spin-free (t3/2ge2/g) configurations of the iron atom, resulting from the approximately equal magnitudes of the ligand field (Δ) and the pairing energy (π) in these complexes. The ligand field and consequently the magnetic behaviour are sensitive to the nature of R1 and R2: electron-withdrawing groups appear to be the most effective in increasing the population of the spin-paired configuration.

Magnetic viscosity, thermal relaxation, and thermal equilibrium noise in Co‐based amorphous alloys at milliKelvin temperatures

1992 ◽  
Vol 72 (10) ◽  
pp. 4820-4825 ◽  
Author(s):  
S. Vitale ◽  
R. Tommasini ◽  
M. Cerdonio ◽  
M. Bonaldi ◽  
A. Cavalleri ◽  
...  
Keyword(s):  
Amorphous Alloys ◽  
Thermal Equilibrium ◽  
Thermal Relaxation ◽  
Magnetic Viscosity ◽  
Millikelvin Temperatures

scholarly journals Ensamble Sampling for Lattice Dynamics

Proceedings ◽  
2019 ◽  
Vol 26 (1) ◽  
pp. 52
Author(s):  
Jochym ◽  
Łażewski
Keyword(s):  
Thermal Equilibrium ◽  
Lattice Dynamics ◽  
Computational Investigation ◽  
Temperature Dependent

Computational investigation of anharmonic and temperature-dependent aspects of lattice dynamics requires, among other things, replication of the conditions of thermal equilibrium. [...]

Oxidation Behavior of the Y56Al24Co20 Bulk Amorphous Alloy Containing Crystalline Composites at 325-450°C

2007 ◽  
Vol 539-543 ◽  
pp. 2117-2122 ◽  
Author(s):  
H.H. Hsieh ◽  
W. Kai ◽  
C.Y. Lin ◽  
Tsung Shune Chin
Keyword(s):  
Amorphous Alloy ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Rate Constants ◽  
Oxidation Kinetics ◽  
Oxidation Behavior ◽  
Bulk Amorphous Alloy ◽  
Temperature Dependent ◽  
Dry Air ◽  
Kinetics Of

The oxidation behavior of Y56Al24Co20 bulk metallic glass containing ~4.2% Y-rich particles was studied over the temperature range of 325-450oC in dry air. The results showed that the oxidation kinetics of the alloy followed the parabolic rate law at T≤375oC, with rate constants generally increased with temperature. Conversely, para-linear kinetics were observed at higher temperatures (T≥400oC). The scales formed on the Y-base amorphous composite were temperature dependent, consisting of exclusively yttrium oxides (Y2O3) at T≤375oC and of mostly Y2O3 and alumina (Al2O3) at temperatures. No evidence of any cobalt-containing oxide was found in the scale.

(111) Monocrystalline Nickel Films

1972 ◽  
Vol 30 ◽  
pp. 512-513
Author(s):  
T.E. Pratt ◽  
R.W. Vook
Keyword(s):  
Film Thickness ◽  
Deposition Rate ◽  
Room Temperature ◽  
Narrow Range ◽  
High Vacuum ◽  
Residual Pressure ◽  
Temperature Dependent ◽  
Deposition Parameters ◽  
Transmission Electron ◽  
Substrate Temperatures

(111) oriented thin monocrystalline Ni films have been prepared by vacuum evaporation and examined by transmission electron microscopy and electron diffraction. In high vacuum, at room temperature, a layer of NaCl was first evaporated onto a freshly air-cleaved muscovite substrate clamped to a copper block with attached heater and thermocouple. Then, at various substrate temperatures, with other parameters held within a narrow range, Ni was evaporated from a tungsten filament. It had been shown previously that similar procedures would yield monocrystalline films of CU, Ag, and Au.For the films examined with respect to temperature dependent effects, typical deposition parameters were: Ni film thickness, 500-800 A; Ni deposition rate, 10 A/sec.; residual pressure, 10-6 torr; NaCl film thickness, 250 A; and NaCl deposition rate, 10 A/sec. Some additional evaporations involved higher deposition rates and lower film thicknesses.Monocrystalline films were obtained with substrate temperatures above 500° C. Below 450° C, the films were polycrystalline with a strong (111) preferred orientation.

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