Abstract
This work is centered on experimental study of the thermal transport of KTaO{sub 3} compounds, characterized by one optical mode presence which softens when temperature decreases. Thermal conductivities of non-doped and doped with polarizing ions (Nb, Na, Li) compounds were specially studied. Acoustical phonons are strongly diffused near 7 K. This resonance was assigned to an interaction between thermal phonons with the soft optical mode, made possible in region where a structural disorder exists. This disorder is locally created by impurities centers, the nature of which we determine by dielectric measurements and by electron paramagnetic resonance. From a more microscopic point of view, we propose to associate the Libron concept to this defect, and we try to make a connection between the observed disorder effects in KTaO{sub 3} and disordered systems physics (Glasses).
Citation Formats
Gravil, J L.
Study contribution of low temperature properties of KTaO{sub 3} based compounds by thermal and dielectric measurements; Contribution a l`etude des proprietes basse temperature des composes a base de KTaO{sub 3} par mesures thermiques et dielectriques.
France: N. p.,
1991.
Web.
Gravil, J L.
Study contribution of low temperature properties of KTaO{sub 3} based compounds by thermal and dielectric measurements; Contribution a l`etude des proprietes basse temperature des composes a base de KTaO{sub 3} par mesures thermiques et dielectriques.
France.
Gravil, J L.
1991.
"Study contribution of low temperature properties of KTaO{sub 3} based compounds by thermal and dielectric measurements; Contribution a l`etude des proprietes basse temperature des composes a base de KTaO{sub 3} par mesures thermiques et dielectriques."
France.
@misc{etde_10150640,
title = {Study contribution of low temperature properties of KTaO{sub 3} based compounds by thermal and dielectric measurements; Contribution a l`etude des proprietes basse temperature des composes a base de KTaO{sub 3} par mesures thermiques et dielectriques}
author = {Gravil, J L}
abstractNote = {This work is centered on experimental study of the thermal transport of KTaO{sub 3} compounds, characterized by one optical mode presence which softens when temperature decreases. Thermal conductivities of non-doped and doped with polarizing ions (Nb, Na, Li) compounds were specially studied. Acoustical phonons are strongly diffused near 7 K. This resonance was assigned to an interaction between thermal phonons with the soft optical mode, made possible in region where a structural disorder exists. This disorder is locally created by impurities centers, the nature of which we determine by dielectric measurements and by electron paramagnetic resonance. From a more microscopic point of view, we propose to associate the Libron concept to this defect, and we try to make a connection between the observed disorder effects in KTaO{sub 3} and disordered systems physics (Glasses).}
place = {France}
year = {1991}
month = {Jul}
}
title = {Study contribution of low temperature properties of KTaO{sub 3} based compounds by thermal and dielectric measurements; Contribution a l`etude des proprietes basse temperature des composes a base de KTaO{sub 3} par mesures thermiques et dielectriques}
author = {Gravil, J L}
abstractNote = {This work is centered on experimental study of the thermal transport of KTaO{sub 3} compounds, characterized by one optical mode presence which softens when temperature decreases. Thermal conductivities of non-doped and doped with polarizing ions (Nb, Na, Li) compounds were specially studied. Acoustical phonons are strongly diffused near 7 K. This resonance was assigned to an interaction between thermal phonons with the soft optical mode, made possible in region where a structural disorder exists. This disorder is locally created by impurities centers, the nature of which we determine by dielectric measurements and by electron paramagnetic resonance. From a more microscopic point of view, we propose to associate the Libron concept to this defect, and we try to make a connection between the observed disorder effects in KTaO{sub 3} and disordered systems physics (Glasses).}
place = {France}
year = {1991}
month = {Jul}
}