Nature of the anomalous spontaneous deformation and of the quasiliquid state of certain metal-hydrogen systems

1984 ◽  
Vol 20 (3) ◽  
pp. 240-243
Author(s):  
V. I. Shapovalov ◽  
V. Yu. Karpov
Keyword(s):  
Spontaneous Deformation ◽  
Hydrogen Systems

scholarly journals Spontaneous deformation of protocatechuic acid crystals

1949 ◽  
Vol 197 (1050) ◽  
pp. 283-294 ◽  
Keyword(s):  
Protocatechuic Acid ◽  
Motion Pictures ◽  
Extensive Study ◽  
The Other ◽  
Three Dimensions ◽  
Stable Configuration ◽  
Unique Case ◽  
The Past ◽  
Spontaneous Deformation ◽  
Lattice Planes

In this paper an extensive study is reported of the very remarkable, and thus far apparently unique, case of the deformation in three dimensions of protocatechuic acid, to which attention was drawn many years ago by Otto Lehmann. The deformations are spontaneous, and are probably due to progressive gliding of the lattice planes, which exist in two configurations, one stable and the other unstable, the latter being the condition of the long prismatic rods when they first form. Such a prism presently deforms into a zigzag crystal, with stable and unstable sections in alternation which, with continuation of the deformation, becomes again straight, but now in the stable configuration. The bending is progressive, like that of an umbrella case, pendant from the end of an oblique cane pointed down, when the latter is pushed into it. The movements are so rapid that motion pictures, made with a microscope, were necessary for the observation of certain stages of the deformation. The deformations have been shown to many chemists and physicists during the past decade or more, none of whom had ever seen or heard of this remarkable type of crystal movement. The deformations are usually observed as the warm saturated solution cools, but they also occur after the crystal has been dried for many hours.

Hydrogen in nanostructured vanadium-hydrogen systems

2001 ◽  
Vol 63 (9) ◽  
Author(s):  
Shin-ichi Orimo ◽  
Frank Kimmerle and Günter Majer
Keyword(s):  
Hydrogen Systems
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