Results 251 to 260 of about 432,058 (303)

Pressure-induced amorphization and an amorphous–amorphous transition in densified porous silicon

Nature, 2001
Crystalline and amorphous forms of silicon are the principal materials used for solid-state electronics and photovoltaics technologies. Silicon is therefore a well-studied material, although new structures and properties are still being discovered. Compression of bulk silicon, which is tetrahedrally coordinated at atmospheric pressure, results in a ...
S K, Deb, M, Wilding, M, Somayazulu, P F, McMillan   +3 more
openaire   +2 more sources

Crystalline–amorphous and amorphous–amorphous transitions in phase-change materials

Journal of Non-Crystalline Solids, 2009
Abstract The transition from the crystalline state to amorphous state and back has been studied in the particular case of the GeSb2Te4 phase-change material by a computer simulation procedure. Modelling at the nanoscale indicates specific structural characteristics, especially the multiplicity of the amorphous phase as opposite to the uniqueness of ...
M. Popescu, F. Sava, A. Velea, A. Lőrinczi   +3 more
openaire   +1 more source

Photoinduced phase transformations in amorphous ZnSe thin films: amorphous-to-amorphous and amorphous-to-nanocrystalline transitions

Thin Solid Films, 2003
Abstract Photoinduced characteristics of amorphous (a-) ZnSe thin films at 10 and 300 K have been investigated using real-time photoluminescence (PL) and X-ray diffraction. The structural phase of as-deposited film is evaluated to be predominantly amorphous with uniformly distributed nano-scale crystallites, and the optical energy gap and complex ...
Hyun-Yong Lee, Seon-Ju Kim, Jin-Woo Kim, Hong-Bay Chung   +3 more
openaire   +1 more source

Amorphous–amorphous transition in a porous coordination polymer

Chemical Communications, 2017
The amorphous state plays a key role in porous coordination polymer and metal–organic framework phase transitions.
Hiroyoshi Ohtsu, Thomas D. Bennett, Tatsuhiro Kojima, David A. Keen, Yasuhiro Niwa, Masaki Kawano   +5 more
openaire   +2 more sources

Amorphous-to-amorphous phase transition in zeolites

JETP Letters, 2006
A transition between two amorphous phases with different densities has been detected in zeolites at high pressures using Raman scattering. The Raman spectra measured at amorphous-to-amorphous phase transitions in zeolites and silicon are almost identical; this fact suggests a common nature of these transitions in both single-and multicomponent ...
N. N. Ovsyuk, S. V. Goryaĭnov
openaire   +1 more source

Trehalose amorphization and recrystallization

Carbohydrate Research, 2008
The stability of the amorphous trehalose prepared by using several procedures is presented and discussed. Amorphization is shown to occur by melting (T(m)=215 degrees C) or milling (room temperature) the crystalline anhydrous form TRE-beta. Fast dehydration of the di-hydrate crystalline polymorph, TRE-h, also produces an amorphous phase.
CESARO, ATTILIO, SUSSICH F.
openaire   +3 more sources

AMORPHOUS WATER

Annual Review of Physical Chemistry, 2004
▪ Abstract  After providing some background material to establish the interest content of this subject, we summarize the many different ways in which water can be prepared in the amorphous state, making clear that there seems to be more than one distinct amorphous state to be considered.
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On the nature of amorphous-to-amorphous and crystal-to-amorphous transitions under high pressure

Journal of Non-Crystalline Solids, 1997
Abstract A number of experimental methods have been applied to study the kinetics of high-pressure solid-state amorphization for some covalent crystals (Si, Ge and GaSb), molecular crystals, C60 and ionic oxides (stishovite and H2O), as well as the amorphous-to-amorphous transitions for H2O and GeO2.
V.V. Brazhkin, A.G. Lyapin, O.V. Stalgorova, E.L. Gromnitskaya, S.V. Popova, O.B. Tsiok   +5 more
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Hall effect in amorphous Si:H and amorphous Si:H/amorphous Ge:H superlattices

Applied Physics Letters, 1988
The sign anomaly in the Hall coefficient observed in substitutionally doped amorphous Si:H and amorphous Ge:H is also found in amorphous Si:H/Ge:H superlattices. The size of the Hall mobility in the superlattice is comparable to the Hall mobility in amorphous Si:H and amorphous Ge:H.
E. K. Sichel, L. Greber, K. Wang
openaire   +1 more source