Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Tytuł pozycji:

Effect of A-site La, Ba, and Sr doping on the threshold field and characteristic temperatures of PbSc0.5Nb0.5O3 relaxor studied by acoustic emission.

Tytuł:
Effect of A-site La, Ba, and Sr doping on the threshold field and characteristic temperatures of PbSc0.5Nb0.5O3 relaxor studied by acoustic emission.
Autorzy:
Dul'kin, E.
Mihailova, B.
Gospodinov, M.
Roth, M.
Temat:
DIELECTRICS research
PERMITTIVITY
EMISSIONS (Air pollution)
ELECTRIC fields
STRONTIUM
Źródło:
Journal of Applied Physics; Feb2013, Vol. 113 Issue 5, p054105, 5p, 1 Chart, 6 Graphs
Czasopismo naukowe
The behavior of the temperature of the dielectric-permittivity maximum Tm, the intermediate temperature T*, and the Burns temperature Td in stoichiometric PbSc0.5Nb0.5O3 (PSN) as well as in PSN heavily doped on the A-site by La (PSN-La), Ba (PSN-Ba), and Sr (PSN-Sr) was studied by means of acoustic emission (AE) under an external dc electric field (E). For all compounds, Tm exhibits a non-trivial behavior when applying E, namely, it initially decreases with the increase of E, attain a minimum at a threshold field Eth, ranging from 0.55 kV/cm for PSN to 0.25 kV/cm for PSN-Sr, and then Tm starts to increase with further increase of E. The minimum of Tm is accompanied by a pronounced maximum of the AE count rate N, which at Eth varies from 10.0 s-1 to 3.0 s-1 for all the compounds, respectively. The similarities and difference between PSN, PSN-Ba, PSN-La, and PSN-Sr with respect to Eth, the N, and the normalized AE parameter η are discussed from the viewpoint of three mechanisms: (i) chemically induced random local electric fields due to the extra charge on the A-site ion, (ii) disturbance of the system of stereochemically active lone-pair electrons of Pb2+ by the isotropic outermost electron shell of the substituting ion, and (iii) change in the tolerance factor and elastic fields related to the larger ionic radius of the substituting A-site ion. The characteristic temperatures T* and Td also exhibit a non-trivial behavior under E, which is better pronounced for pure PSN than for the A-site-substituted PSN compounds. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Applied Physics is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies