Experimental temperature dependence of the magnetization of surface layers of Fe at interfaces with nonmagnetic materials

1985 ◽  
Vol 25 (1-4) ◽  
pp. 419-425 ◽  
Author(s):  
J. C. Walker
Keyword(s):  
Temperature Dependence ◽  
Experimental Temperature ◽  
Surface Layers ◽  
Experimental Temperature Dependence

scholarly journals Impact of ZrO2 Additive on Microstructure, Magnetic Properties, and Temperature Dependence of the Initial Permeability of LiTiZn Ferrite Ceramics

2021 ◽  
Author(s):  
Andrey Malyshev ◽  
Anna B. Petrova ◽  
Anatoly P. Surzhikov
Keyword(s):  
Magnetic Properties ◽  
Temperature Dependence ◽  
Defect Structure ◽  
Initial Permeability ◽  
Experimental Temperature ◽  
Mathematical Treatment ◽  
Experimental Temperature Dependence ◽  
Average Grain Size ◽  
Soft Ferrite ◽  
Microstructure And Magnetic Properties

Abstract The effect of the diamagnetic ZrO2 addition on the microstructure and magnetic properties of LiTiZn ferrite ceramics, including the shape and parameters of the temperature dependence of the initial permeability, has been investigated. The defect structure of ferrite ceramic samples is assessed according to our earlier proposed method based on mathematical treatment of the experimental temperature dependencies of the initial permeability. The method is recommended for defects monitoring of soft ferrite ceramics and ferrite products. It was found that the defect structure of ferrite ceramics increased by 350% with an increase in the concentration of the ZrO2 additive in the range of (0–0.5) wt.%. In this case, for the same samples, the increase in the true physical broadening of reflections is only 20%, and the coercive force by 50%. Simultaneously, the maximum of the experimental temperature dependence of the initial permeability dropped by 45%. The microstructure of all samples is characterized with a similar average grain size according to the SEM data. However, samples with the 0.5wt.% of ZrO2 are characterized by the formation of conglomerates. A linear relationship was obtained between the defect structure and the width of the reflections, which indicates that this parameter is related to the elastic stress of ferrite ceramics.

Theoretical and experimental temperature dependence of GaAs N-off IC's over 120 K to 400 K

Physica B+C ◽  
1985 ◽  
Vol 129 (1-3) ◽  
pp. 403-407
Author(s):  
Bertrand Gabillard ◽  
Christian Rocher ◽  
Marc Rocchi
Keyword(s):  
Temperature Dependence ◽  
Experimental Temperature ◽  
Experimental Temperature Dependence

scholarly journals Temperature Dependence of Raman Frequency Shift in SrWO4 Crystal Studied by Lattice Dynamical Calculations

Crystals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 197 ◽  
Author(s):  
Jun Suda ◽  
Petr Zverev
Keyword(s):  
Frequency Shift ◽  
Temperature Dependence ◽  
Temperature Shift ◽  
Order Perturbation ◽  
Perturbative Approach ◽  
First Order ◽  
Experimental Temperature Dependence ◽  
Raman Lasers ◽  
Anharmonic Term ◽  
Raman Modes

The frequency shift of the Raman modes in strontium tungstate (SrWO4) was investigated in the temperature range from 15 to 295 K. The experimental temperature dependence of the shift was analyzed using both the lattice dynamical calculations and the lattice perturbative approach. We found that the quartic anharmonic term of the first-order perturbation and the cubic term of the second-order perturbation, as well as the thermal expansion, contribute to the temperature shift of the highest-frequency Ag(ν1) mode. The values of the temperature sensitivity of the frequency shift of the Raman modes at room temperature were measured, which is important for developing high-power crystalline Raman lasers and frequency shifters.

Temperature-Dependent Photoluminescence of Zn–Cu–In–S Quaternary Nanocrystals with Different Reaction Time

2016 ◽  
Vol 16 (4) ◽  
pp. 3720-3723
Author(s):  
Xiaojuan Liu ◽  
Xiaosong Zhang ◽  
Lan Li ◽  
Mingxue Zhu ◽  
Ping Zhou
Keyword(s):  
Reaction Time ◽  
Temperature Dependence ◽  
Line Width ◽  
Experimental Temperature ◽  
Full Width ◽  
Temperature Dependent ◽  
Intensity Decrease ◽  
Energy Line ◽  
Toxic Environment ◽  
Temperature Dependent Photoluminescence

Non-toxic, environment-benign colloidal ZnCuInS Nanocrystals (ZCIS NCs) were synthesized and the temperature dependence of the photoluminescence (PL) energy, line width, and intensity for the ZCIS NCs with different reaction time were studied in the temperature range from 50 to 280 K. Generally, for typical ZCIS NCs ensemble, it has been constantly observed that the PL peaks energy decrease with the experimental temperature raising and the value of Eg(0) decrease with the increase of reaction time. Furthermore, the full width at half maximums (FWHM) of the PL spectra increased with the experimental temperature raising. It was found that the temperature dependence of the integrated PL intensity of ZCIS NCs decrease with the experimental temperature raising and the intensity decrease much with increasing reaction time.

scholarly journals Study of the Temperature Dependence of a Carbidized Layer Formation on the Tungsten Surface Under Plasma Irradiation

2021 ◽  
Author(s):  
Victor Baklanov ◽  
Gainiya Zhanbolatova ◽  
Mazhyn K Skakov ◽  
Arman Miniyazov ◽  
Igor Sokolov ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Layer Formation ◽  
Tungsten Carbides ◽  
X Ray Diffraction ◽  
Surface Layers ◽  
Temperature Range ◽  
Carbide Phases ◽  
Plasma Irradiation ◽  
Tungsten Surface ◽  
Sequential Formation

Abstract The paper considers a method of tungsten surface carbidization using a beam-plasma discharge (BPD), which was implemented in a plasma-beam installation (PBI). The advantage of this method is to create conditions for chemical reactions and physical processes as close as possible to those possible in thermonuclear installations. The BPD makes it possible to generate plasma using different working gases. Methane was used as a plasma-forming gas. The working gas pressure in a chamber was (1,3-1,4)·10-1 Pa. The temperature dependence of the carbidized layer formation on the tungsten surface under plasma irradiation was determined in the temperature range of 700-1700 °C. The formation of tungsten carbides in surface layers was confirmed by SEM and X-ray diffraction analysis. It was found that interaction between tungsten and methane in a wide temperature range can proceed with simultaneous or sequential formation of the carbide phases W2C and WC.

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