The TDPAC study of the hyperfine interactions at 111Cd nuclei in RAl3 compounds synthesized under high pressure

2007 ◽  
Vol 142 (11) ◽  
pp. 664-669 ◽  
Author(s):  
A.V. Tsvyashchenko ◽  
L.N. Fomicheva ◽  
V.B. Brudanin ◽  
O.I. Kochetov ◽  
A.V. Salamatin ◽  
...  
Keyword(s):  
High Pressure ◽  
Hyperfine Interactions ◽  
Tdpac Study

High pressure Mössbauer study of hyperfine interactions in europium metal

1976 ◽  
Vol 18 (3) ◽  
pp. 291-293 ◽  
Author(s):  
U.F. Klein ◽  
G. Wortmann ◽  
G.M. Kalvius
Keyword(s):  
High Pressure ◽  
Hyperfine Interactions ◽  
Mössbauer Study

Hyperfine Interactions at 181Ta in Hf2Ni7 and Zr2Ni7

2000 ◽  
Vol 55 (1-2) ◽  
pp. 49-53 ◽  
Author(s):  
M. Marszałek ◽  
H. Saitovitch ◽  
P. R. J. Silva
Keyword(s):  
Hyperfine Interactions ◽  
Magnetic Interaction ◽  
Electric Quadrupole ◽  
Electric Quadrupole Interaction ◽  
Monoclinic Symmetry ◽  
Angular Correlations ◽  
Quadrupole Interactions ◽  
Arc Melting ◽  
Time Differential ◽  
Tdpac Study

We report on a time differential perturbed angular correlations (TDPAC) study of the hyperfine interactions at 181Ta in Hf2Ni7 and Zr2Ni7. The samples were prepared by arc melting proper amounts of constituents together with a small amount of Hf containing radioactive 181Hf atoms. A further heat treatment was necessary to obtain samples of the required crystal structure (monoclinic symmetry in the C2/m space group). As known, two non-equivalent lattice sites of Hf/Zr metal exist in this structure.The PAC measurements were performed at 20 - 1123 K. Two quadrupole interactions were observed, corresponding to two possible crystallographic positions of the probe atom in the studied structure. The electric quadrupole interaction parameters at 181Ta in Hf2Ni7 are υQ1(300K) = 586.7(65) MHz with η1 = 0.79(4) and υQ2(300K) = 466.8(41) MHz with η2 = 0.20(3), and in Zr2Ni7 they are υQ1(300K) = 498.4(22) MHz with η1 = 1.0 and υQ2(300K) = 418.0(50) MHz with η2 = 0.35(3). The presence of a magnetic interaction, reported in the literature, was not confirmed.

scholarly journals 57Fe Hyperfine Interactions in the Sc(Fe1-xNix)2Laves Phases Synthesized under High Pressure

2008 ◽  
Vol 114 (6) ◽  
pp. 1517-1527 ◽  
Author(s):  
M. Wiertel ◽  
Z. Surowiec ◽  
M. Budzyński ◽  
A.V. Tsvyashchenko
Keyword(s):  
High Pressure ◽  
Hyperfine Interactions

scholarly journals Electric field gradients in MgB2 synthesized at high pressure: 111Cd TDPAC study and ab initio calculation

2001 ◽  
Vol 119 (3) ◽  
pp. 153-158 ◽  
Author(s):  
A.V. Tsvyashchenko ◽  
L.N. Fomicheva ◽  
M.V. Magnitskaya ◽  
E.N. Shirani ◽  
V.B. Brudanin ◽  
...  
Keyword(s):  
High Pressure ◽  
Electric Field ◽  
Ab Initio ◽  
Ab Initio Calculation ◽  
Electric Field Gradients ◽  
Field Gradients ◽  
Tdpac Study

MöSSBAUER STUDY OF HYPERFINE INTERACTIONS IN NpAs AT HIGH PRESSURE

1987 ◽  
pp. 148-150
Author(s):  
Ulrike POTZEL ◽  
J. MOSER ◽  
W. POTZEL ◽  
F.J. LITTERST ◽  
G.M. KALVIUS ◽  
...  
Keyword(s):  
High Pressure ◽  
Hyperfine Interactions ◽  
Mössbauer Study

Mössbauer study of hyperfine interactions in NpAs at high pressure

1987 ◽  
Vol 63-64 ◽  
pp. 148-150 ◽  
Author(s):  
Ulrike Potzel ◽  
J. Moser ◽  
W. Potzel ◽  
F.J. Litterst ◽  
G.M. Kalvius ◽  
...  
Keyword(s):  
High Pressure ◽  
Hyperfine Interactions ◽  
Mössbauer Study

High-pressure freezing of cells in suspension for low-voltage scanning electron microscopy (LVSEM)

1991 ◽  
Vol 49 ◽  
pp. 64-65
Author(s):  
Marek Malecki ◽  
James Pawley ◽  
Hans Ris
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
Low Voltage ◽  
Culture Media ◽  
Cell Structure ◽  
Freeze Substitution ◽  
Ice Crystal ◽  
High Pressure Freezing ◽  
Cell Culture Media ◽  
Voltage Scanning

The ultrastructure of cells suspended in physiological fluids or cell culture media can only be studied if the living processes are stopped while the cells remain in suspension. Attachment of living cells to carrier surfaces to facilitate further processing for electron microscopy produces a rapid reorganization of cell structure eradicating most traces of the structures present when the cells were in suspension. The structure of cells in suspension can be immobilized by either chemical fixation or, much faster, by rapid freezing (cryo-immobilization). The fixation speed is particularly important in studies of cell surface reorganization over time. High pressure freezing provides conditions where specimens up to 500μm thick can be frozen in milliseconds without ice crystal damage. This volume is sufficient for cells to remain in suspension until frozen. However, special procedures are needed to assure that the unattached cells are not lost during subsequent processing for LVSEM or HVEM using freeze-substitution or freeze drying. We recently developed such a procedure.

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