The effect of high pressure upon the valence transition in EuPd2Si2

1991 ◽  
Vol 3 (29) ◽  
pp. 5465-5468 ◽  
Author(s):  
D M Adams ◽  
A E Heath ◽  
H Jhans ◽  
A Norman ◽  
S Leonard
Keyword(s):  
High Pressure ◽  
Valence Transition

Pressure-induced structural and valence transition in AgO

2016 ◽  
Vol 18 (22) ◽  
pp. 15322-15326 ◽  
Author(s):  
Chunju Hou ◽  
Jorge Botana ◽  
Xu Zhang ◽  
Xianlong Wang ◽  
Maosheng Miao
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Ambient Pressure ◽  
Charge Ordering ◽  
Valence Transition

AgO charge ordering at ambient pressure is inhibited at high pressure as it experiences a phase transition at ∼77 GPa. This phase transition is accompanied by an insulator-to-metal transition.

Field-induced valence transition under high pressure in EuNi2(Ge1−xSix)2

2001 ◽  
Vol 226-230 ◽  
pp. 167-169 ◽  
Author(s):  
A Mitsuda ◽  
T Goto ◽  
H Wada ◽  
M Shiga
Keyword(s):  
High Pressure ◽  
Valence Transition

The continuous valence transition in CeS under high pressure

1986 ◽  
Vol 19 (32) ◽  
pp. 6297-6302 ◽  
Author(s):  
I Vedel ◽  
A M Redon ◽  
J M Leger ◽  
J Rossat-Mignod ◽  
O Vogt
Keyword(s):  
High Pressure ◽  
Valence Transition

Competition between the valence transition and the magnetic ordering of YbInCu4 probed by 63Cu NQR at high pressure

2006 ◽  
Vol 67 (1-3) ◽  
pp. 500-502
Author(s):  
T. Koyamai ◽  
M. Nakamura ◽  
T. Mito ◽  
S. Wada ◽  
J.L. Sarrao
Keyword(s):  
High Pressure ◽  
Magnetic Ordering ◽  
Valence Transition

New Ternary Boride EuRh4B4 Synthesized under High Pressure and Temperature

2012 ◽  
Vol 190 ◽  
pp. 421-424
Author(s):  
A. Smekhova ◽  
L.N. Fomicheva ◽  
A.V. Tsvyashchenko ◽  
V.A. Sidorov ◽  
Andrei Rogalev
Keyword(s):  
High Pressure ◽  
Ac Susceptibility ◽  
Magnetic Moments ◽  
X Ray Diffraction ◽  
Valence Transition ◽  
High Pressure And Temperature ◽  
Ternary Boride ◽  
Magnetic States ◽  
First Time ◽  
The Eu

We report the results of a detailed study of EuRh4B4 compound synthesized by an un-common method under high pressure temperature conditions for the first time. Synthesized sample has been initially characterized by X-ray diffraction, macroscopic electrical resistivity and ac-susceptibility methods. The ferromagnetic and superconducting phases were found below 83K and 5.8K respectively. Element-and shell-selective XANES and XMCD techniques have been further applied to check the possible valence transition of Eu ions and their magnetic states. XANES spectra recorded at the Eu L2,3 absorption edges clearly indicate the presence of either magnetic Eu2+ or non-magnetic Eu3+ ions in the sample. The XMCD studies have also shown that local magnetic moments of Eu2+ ions exist in the superconducting EuRh4B4, at least above the transition.

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.

Prolonged Fixation Studies For Spaceflight

1973 ◽  
Vol 31 ◽  
pp. 332-333
Author(s):  
Robert Corbett ◽  
Delbert E. Philpott ◽  
Sam Black
Keyword(s):  
High Pressure ◽  
Living Systems ◽  
Prolonged Storage ◽  
Time Intervals ◽  
Early Signs ◽  
Large Numbers

Observation of subtle or early signs of change in spaceflight induced alterations on living systems require precise methods of sampling. In-flight analysis would be preferable but constraints of time, equipment, personnel and cost dictate the necessity for prolonged storage before retrieval. Because of this, various tissues have been stored in fixatives and combinations of fixatives and observed at various time intervals. High pressure and the effect of buffer alone have also been tried.Of the various tissues embedded, muscle, cartilage and liver, liver has been the most extensively studied because it contains large numbers of organelles common to all tissues (Fig. 1).

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