Application of Spectroscopic Probes in Study of Ferroelectrics

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Application of Spectroscopic Probes in Study of Ferroelectrics

Popis výsledku v původním jazyce

Photoluminescence (PL), thermally stimulated luminescence (TSL), and photosensitivity of SrTiO3 and Cd2Nb2O7 crystals with Mn4+ and Cr3+ spectroscopic probes, respectively, were studied. Manganese doping of SrTiO3 results in structured luminescence of Mn4+ consisting of narrow zero-phonon (ZPL) R- line (2E r 4A2) and vibrational sidebands. It is suggested that unusually large temperature shift of ZPL is caused mainly by the contribution of the lowest TO soft optical branch into interaction of emitting center with a lattice. The PL spectrum of Cd2Nb2O7:Cr3+ consists of four narrow emission lines accompanied by vibrational sidebands. Emission lines are attributed to the zero-phonon transitions 2E r 4A2 of two kinds of octahedral coordinated Cr3+ centers.The change in activation energies of PL thermal quenching at Tc = 196 K is tentatively explained by a change of the adiabatic potential of the Cr3+ centers at the ferroelectric phase transition of Cd2Nb2O7 at Tc.

Název v anglickém jazyce

Application of Spectroscopic Probes in Study of Ferroelectrics

Popis výsledku anglicky

Photoluminescence (PL), thermally stimulated luminescence (TSL), and photosensitivity of SrTiO3 and Cd2Nb2O7 crystals with Mn4+ and Cr3+ spectroscopic probes, respectively, were studied. Manganese doping of SrTiO3 results in structured luminescence of Mn4+ consisting of narrow zero-phonon (ZPL) R- line (2E r 4A2) and vibrational sidebands. It is suggested that unusually large temperature shift of ZPL is caused mainly by the contribution of the lowest TO soft optical branch into interaction of emitting center with a lattice. The PL spectrum of Cd2Nb2O7:Cr3+ consists of four narrow emission lines accompanied by vibrational sidebands. Emission lines are attributed to the zero-phonon transitions 2E r 4A2 of two kinds of octahedral coordinated Cr3+ centers.The change in activation energies of PL thermal quenching at Tc = 196 K is tentatively explained by a change of the adiabatic potential of the Cr3+ centers at the ferroelectric phase transition of Cd2Nb2O7 at Tc.

Druh

D - Stať ve sborníku

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2003

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

NATO Advanced Research Workshop on the Disordered Ferroelectrics

ISBN

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ISSN

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e-ISSN

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Počet stran výsledku

1

Strana od-do

48-48

Název nakladatele

Institute of Problems of Material Science NAS of Ukraine

Místo vydání

Kyjev

Místo konání akce

Kyjev

Datum konání akce

29. 5. 2003

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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