Self and Impurity Diffusion in Icosahedral Al-Pd-Mn Quasicrystals

1998 ◽  
Vol 527 ◽  
Author(s):  
W. Sprengel ◽  
H. Nakajima ◽  
T.A. Lograsso
Keyword(s):  
Arrhenius Equation ◽  
Diffusion Mechanism ◽  
Radioactive Tracer ◽  
Tracer Method ◽  
Precision Grinding ◽  
Exponential Factor ◽  
Diffusion Behavior ◽  
Icosahedral Quasicrystals ◽  
Grinding Technique ◽  
Radioactive Tracer Method

ABSTRACTDiffusivities of Cr in icosahedral quasicrystals of Al-Pd-Mn system have been measured by the radioactive tracer method in combination with a precision grinding technique. The temperature dependence of the diffusivities follows the Arrhenius equation in the investigated temperature range from 850 to 1107 K. The activation energy Q = 235.5 ± 7.8 kJmol-1 and pre-exponential factor D0 = 1.2 × 10-2 m2s-1 were evaluated. The diffusion behavior is discussed in terms of a vacancy diffusion mechanism.

New Application of Radioactive Tracer Method for the Sediment Movement Measurements in the Nearshore Zone

1989 ◽  
Vol 25 (8) ◽  
pp. 330-334
Author(s):  
A. Owezarezyk ◽  
M. Strzelecki ◽  
St. Szpilowski ◽  
R. Wierzchnicki ◽  
T. Basiński
Keyword(s):  
Radioactive Tracer ◽  
Nearshore Zone ◽  
Tracer Method ◽  
Sediment Movement ◽  
Radioactive Tracer Method

scholarly journals Dynamics of Iron Uptake and Fe3O4 Biomineralization during Aerobic and Microaerobic Growth of Magnetospirillum gryphiswaldense

1998 ◽  
Vol 180 (1) ◽  
pp. 159-162 ◽  
Author(s):  
Dirk Schüler ◽  
Edmund Baeuerlein
Keyword(s):  
Iron Uptake ◽  
Iron Transport ◽  
Radioactive Tracer ◽  
Crystal Formation ◽  
Low Oxygen ◽  
Tracer Method ◽  
Magnetospirillum Gryphiswaldense ◽  
Radioactive Tracer Method ◽  
Low Oxygen Concentration ◽  
Light Scattering Technique

ABSTRACT Iron uptake and magnetite (Fe3O4) crystal formation could be studied in the microaerophilic magnetic bacteriumMagnetospirillum gryphiswaldense by using a radioactive tracer method for iron transport and a differential light-scattering technique for magnetism. Magnetite formation occurred only in a narrow range of low oxygen concentration, i.e., 2 to 7 μM O2 at 30°C. Magnetic cells stored up to 2% iron as magnetite crystals in intracytoplasmic vesicles. This extraordinary uptake of iron was coupled tightly to the biomineralization of up to 60 magnetite crystals with diameters of 42 to 45 nm.

The radioactive tracer method of studying the erosion of the refractory lining in the sintering zone of rotary kilns

Refractories ◽  
1977 ◽  
Vol 18 (3-4) ◽  
pp. 223-226
Author(s):  
V. I. Shubin ◽  
V. I. Nikonorov ◽  
Yu. A. Kurbatov ◽  
O. M. Stanulionis ◽  
V. P. Vasil'ev ◽  
...  
Keyword(s):  
Refractory Lining ◽  
Radioactive Tracer ◽  
Tracer Method ◽  
Rotary Kilns ◽  
Radioactive Tracer Method
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