Properties of colour centres in CaF2 single crystals subjected to high electric fields and X-ray irradiation

1992 ◽  
Vol 27 (5) ◽  
pp. 1189-1192
Author(s):  
A. De ◽  
K. V. Rao
Keyword(s):  
Single Crystals ◽  
Electric Fields ◽  
Colour Centres ◽  
X Ray ◽  
High Electric Fields

Domain Dynamics under Unipolar Electric Fields for BaTiO3 Single Crystals

2013 ◽  
Vol 582 ◽  
pp. 40-43
Author(s):  
Shotaro Ishikawa ◽  
Yuuki Kitanaka ◽  
Yuji Noguchi ◽  
Masaru Miyayama ◽  
Chikako Moriyoshi ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Single Crystals ◽  
Electric Fields ◽  
Direct Evidence ◽  
Reversible Change ◽  
X Ray ◽  
Domain Structures ◽  
Diffraction Patterns ◽  
Domain Dynamics

Domain structures and dynamics of BaTiO3 single crystals under in-situ electric fields along <110>c were investigated by using synchrotron radiation single-crystal X-ray diffractions. Diffraction patterns clearly show the presence of a 90 ° domain structure in the crystals poled along <110>c. The diffraction analysis provides direct evidence of a reversible change in the volume fractions of two kinds of the 90 o domains under unipolar in-situ electric fields. This reversible change in the domain structures under unipolar fields is suggested to originate from the interaction between spontaneous polarization and defect dipoles composed of acceptor and oxygen vacancy.

High Mobilities in Organic Molecular Crystals

1999 ◽  
Vol 598 ◽  
Author(s):  
Jan Hendrik Schön ◽  
Steffen Berg ◽  
Christian Kloc ◽  
Bertram Batlogg
Keyword(s):  
Single Crystals ◽  
Electric Fields ◽  
Phonon Scattering ◽  
Effective Bandwidth ◽  
Hot Carrier ◽  
Organic Molecular Crystals ◽  
Electric Field Dependence ◽  
Hot Carrier Effects ◽  
High Electric Fields ◽  
Molecular Semiconductors

ABSTRACTThe charge transport in high quality single crystals of various organic molecular semiconductors is investigated. Band-like motion in delocalized states is observed in various polyacene and oligothiophene single crystals. The electric field dependence of the mobility is ascribed to acoustic phonon scattering. Furthermore, hot carrier effects can be observed at low temperatures and high electric fields. Band-like transport changes over to hopping motion when the effective bandwidth shrinks, i.e. at high temperatures or in crystallographic directions of small molecular orbital overlap.

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