Results 151 to 160 of about 3,316 (204)
Some of the next articles are maybe not open access.
Physica Status Solidi (a), 1978
Pyroelectricity is observed and measured in poly-2,4-hexadiyne-1,6-diol bis(p-toluene sulphonate), (abbreviated PTS), between 76 and 300 K. PTS is claimed to be monoclinic and to belong to the space group P21/c, i.e. it should have a center of symmetry, so that the observation of pyroelectricity is in conflict with the structure determination.
H. Kiess, R. Clarke
openaire +1 more source
Pyroelectricity is observed and measured in poly-2,4-hexadiyne-1,6-diol bis(p-toluene sulphonate), (abbreviated PTS), between 76 and 300 K. PTS is claimed to be monoclinic and to belong to the space group P21/c, i.e. it should have a center of symmetry, so that the observation of pyroelectricity is in conflict with the structure determination.
H. Kiess, R. Clarke
openaire +1 more source
Equivalent pyroelectric coefficient of a pyroelectric bimorph structure
Journal of Applied Physics, 2000A detailed formula for the equivalent pyroelectric coefficient of a bimorph structure acting as a pyroelectric detector was deduced. It is shown that electric fields occur in the structure when it is subjected to a temperature variation, due to the unequal charges generated by the two components.
L. Pintilie, I. Pintilie, I. Matei
openaire +1 more source
Pyroelectric and Electrocaloric Materials
J. Mater. Chem. C, 2013Both the pyroelectric and electrocaloric effects originate from the cross-coupling between polarization and temperature in insulating dielectrics. Although both effects have been studied for many decades for various applications and large pyroelectric effect has been observed in many polar-dielectrics, it is only very recently that a large ...
Xinyu Li +5 more
openaire +1 more source
Nature Materials, 2018
Using a thin-film geometry and electric-field-driven enhancement of pyroelectric response, a relaxor ferroelectric is shown to display superior power densities for thermal harvesting.
Joseph P, Feser, Jayakanth, Ravichandran
openaire +2 more sources
Using a thin-film geometry and electric-field-driven enhancement of pyroelectric response, a relaxor ferroelectric is shown to display superior power densities for thermal harvesting.
Joseph P, Feser, Jayakanth, Ravichandran
openaire +2 more sources
Systematic Study of Pyroelectricity. Ferroelectricity and Pyroelectricity in the Perovskites
1975Abstract : The relation between ferroelectricity and pyroelectricity in the perovskites is explored using Devonshire's phenomenological theory of ferroelectricity and a new microscopic theory obtained by generalizing the conventional molecular field theory.
P. M. Raccah, M. I. Bell
openaire +1 more source
Piezo- and Pyroelectric Properties
1980Some polymers can be made both piezo- and pyroelectric by suitable application of a large electric field. This effect is true piezo- and pyroelectricity rather than electrostriction, conduction, electromechanical effects, or the motion of conductors in the field of space charges. Two distinct types of polymers can be piezoelectric.
M. G. Broadhurst, G. T. Davis
openaire +1 more source
The Journal of Physical Chemistry B, 2008
Water ice usually is thought to have zero pyroelectricity by symmetry. However, biasing it with ions breaks the symmetry because of the induced partial dipole alignment. This unmasks a large pyroelectricity. Ions were soft-landed upon 1 mum films of water ice at temperatures greater than 160 K. When cooled below 140-150 K, the dipole alignment locks in.
Hanfu, Wang +5 more
openaire +2 more sources
Water ice usually is thought to have zero pyroelectricity by symmetry. However, biasing it with ions breaks the symmetry because of the induced partial dipole alignment. This unmasks a large pyroelectricity. Ions were soft-landed upon 1 mum films of water ice at temperatures greater than 160 K. When cooled below 140-150 K, the dipole alignment locks in.
Hanfu, Wang +5 more
openaire +2 more sources
Organic Thin Films for Photonic Applications, 1993
Second-order nonlinear optical polymers must be poled in order to achieve the required non-centrosymmetry. Periodically poled materials are required for phase-matched operation of polarization converters1 and parametric devices2. For second-harmonic generation with modes of different order1, three-dimensionally (3-D) poled patterns are needed to ...
S. Bauer +4 more
openaire +1 more source
Second-order nonlinear optical polymers must be poled in order to achieve the required non-centrosymmetry. Periodically poled materials are required for phase-matched operation of polarization converters1 and parametric devices2. For second-harmonic generation with modes of different order1, three-dimensionally (3-D) poled patterns are needed to ...
S. Bauer +4 more
openaire +1 more source
Relationship between the pyroelectric coefficient and the lattice dynamics of the pyroelectrics
Solid State Communications, 1983Abstract The experimental results for a temperature dependence of the pyroelectric coefficient are represented for twenty different crystals in a wide temperature range. Current theories are used for an analytical fitting of this result. It is shown that in the ferroelectrics the pyroelectric coefficient γσ is defined mainly by optical phonon modes ...
N.D. Gavrilova +3 more
openaire +1 more source
Low Temperature Physics, 2017
The acoustoelectric transformation in single-crystal LiCoPO4 is studied. At temperatures corresponding to the paramagnetic phase, a piezoresponse to longitudinal elastic deformation parallel to the crystallographic a axis is observed. Arguments are introduced in support of identifying this compound as pyroelectric, as opposed to the generally accepted ...
M. P. Kolodyazhnaya +5 more
openaire +1 more source
The acoustoelectric transformation in single-crystal LiCoPO4 is studied. At temperatures corresponding to the paramagnetic phase, a piezoresponse to longitudinal elastic deformation parallel to the crystallographic a axis is observed. Arguments are introduced in support of identifying this compound as pyroelectric, as opposed to the generally accepted ...
M. P. Kolodyazhnaya +5 more
openaire +1 more source