The ambipolar Auger coefficient: Measured temperature dependence in electron irradiated and highly injected n-type silicon

1997 ◽  
Vol 81 (5) ◽  
pp. 2256-2262 ◽  
Author(s):  
P. Jonsson ◽  
H. Bleichner ◽  
M. Isberg ◽  
E. Nordlander
Keyword(s):  
Temperature Dependence ◽  
Measured Temperature ◽  
Type Silicon

Silver Self-Diffusion in Al2O3/QE22 Magnesium Alloy Matrix Composite

2009 ◽  
Vol 283-286 ◽  
pp. 155-160
Author(s):  
Ivo Stloukal ◽  
Jiří Čermák
Keyword(s):  
Magnesium Alloy ◽  
Temperature Dependence ◽  
Temperature Interval ◽  
Matrix Composite ◽  
Diffusion Coefficients ◽  
Volume Diffusion ◽  
Effective Diffusion ◽  
Measured Temperature ◽  
Alloy Matrix ◽  
Self Diffusion

Self-diffusion of 110mAg has been investigated in fiber reinforced QE22 magnesium alloy matrix composite. Short Saffil fibers (97% -Al2O3 + 3% SiO2) were used as reinforcement. The diffusion measurements were carried out in the temperature interval 648 – 728 K by serial sectioning method. The volume diffusion coefficients Dv (alloy without reinforcement) and the effective diffusion coefficients Deff (alloy with reinforcement) were obtained by analysis of the penetration curves. The silver diffusion coefficient in the interface boundary matrix/Saffil Di was also estimated. The temperature dependence of volume diffusion coefficients Dv was compared with previous data measured using 65Zn in the same alloy and with literature data for Zn impurity diffusion in Mg single crystal. It was observed, that the temperature dependence of both Deff and Di was significantly non-linear in the measured temperature interval. This behavior supports previous observations with zinc diffusion in the same alloy.

Magnetic, electrical, and thermal characterization of La0.9Te0.1Mn1−xCoxO3 (0 ≤ x ≤ 1)

2007 ◽  
Vol 22 (10) ◽  
pp. 2943-2952
Author(s):  
R. Ang ◽  
Y.P. Sun ◽  
G.H. Zheng ◽  
W.H. Song
Keyword(s):  
Temperature Dependence ◽  
Temperature Region ◽  
Configurational Entropy ◽  
Thermal Characterization ◽  
Measured Temperature ◽  
Magnetic Exchange ◽  
Space Group ◽  
Co Doping ◽  
Jahn Teller ◽  
Anomalous Peak

The structure, magnetization M, resistivity ρ, thermoelectric power S, and thermal conductivity κ in La0.9Te0.1Mn1−xCoxO3 (0 ≤ x ≤ 1) have been investigated systematically. The samples with x = 0 and x = 1 have a rhombohedral lattice with space group R¯3C, while the samples with x = 0.25, 0.50, and 0.75 have an orthorhombic lattice with space group Pbnm. The samples of 0 ≤ x ≤ 0.75 undergo the paramagnetic–ferromagnetic (PM–FM) phase transition. Based on the temperature dependence of susceptibility, a combination of the high-spin (HS) state for Co2+ and the low-spin (LS) state for Co3+ can be determined. The metal–insulator transitions (MIT) observed for x = 0 sample are completely suppressed with Co-doping, and ρ(T) displays semiconducting behavior within the measured temperature region for x > 0 samples. As x ⩾ 0.25, the huge magnitude of Seebeck coefficient at low temperatures is observed, which is suggested to originate from the spin-state transition of Co3+ ions from intermediate-spin (IS) state or (HS) state to (LS) state and the configurational entropy of charge carriers enhanced by their spin and orbital degeneracy between Co2+ and Co3+ sites. Particularly, S(T) of x = 0.50 and 0.75 samples appears an anomalous peak, which is suggested to be related to the contribution of phonon drag. Similar to M(T) and ρ(T), all results of S(T) are discussed according to the variations of the structure parameters and magnetic exchange interaction caused by Co-doping. In addition, based on the analysis of the temperature dependence of S(T) and ρ(T), the transport mechanism can be determined in the different temperature region. As to thermal conduction κ(T), the changes of κ with Co-doping is suggested to come from the combined effect due to the suppression of local Mn3+O6 Jahn–Teller (JT) lattice distortion because of the substitution of non JT Co3+ ions with LS and HS states for JT Mn3+ ions, which results in the increase of κ, and the introduction of the disorder due to Co-doping, which contributes to the decrease of κ.

Temperature dependence of the Faraday rotation in n-type silicon

Physica B+C ◽  
1980 ◽  
Vol 100 (1) ◽  
pp. 88-92 ◽  
Author(s):  
W. Grevendonk ◽  
P. van den Keybus ◽  
G. Ruymbeek ◽  
B. Vanhuyse
Keyword(s):  
Temperature Dependence ◽  
Faraday Rotation ◽  
Type Silicon
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