Ti3+ on Nb site: A paramagnetic Jahn-Teller center in vacuum-reduced LiNbO3:Mg:Ti single crystals

G. Corradi, I. M. Zaritskii, A. Hofstaetter, K. Polgár, L. G. Rakitina

Research output: Contribution to journalArticle

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Abstract

An axial EPR signal observed in vacuum annealed LiNbO3 single crystals doped with 8 mol % Mg and 0.05 mol % Ti has been attributed to Ti3+ on Nb site. The g tensor components (g = 1.760±0.005 and g of the orbital reduction factor (from k=0.16 to 0.13), can be explained by a dynamic pseudo-Jahn-Teller effect. The vibronic coupling of the center is much stronger than that reported for other nd1 centers with similar trigonally distorted octahedral coordination in LiNbO3 like the Ti3+ on Li site and trapped Nb4+ polarons on both cation sites. Stronger coupling for ions on or near the Nb site is understood as a result of smaller trigonal splitting of the ground state due to the more central position of the Nb site in the oxygen octahedron. Electron transfer from the observed Ti3+ center to lattice niobiums, resulting in Nb4+ trapped polarons, has been stimulated by illumination in the near UV region. The average energy difference of the involved Ti4+/3+ and Nb5+/4+ donor levels has been estimated to be 70±23 meV depending also on the distance of compensating Mg2+ ions on nearby Li sites.

Original languageEnglish
Pages (from-to)8329-8337
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume58
Issue number13
Publication statusPublished - Oct 1 1998

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Polarons
Single crystals
polarons
Vacuum
Ions
Jahn-Teller effect
vacuum
single crystals
Crystal lattices
Ground state
Tensors
Paramagnetic resonance
Cations
Lighting
Positive ions
Oxygen
Electrons
electron transfer
ions
illumination

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Ti3+ on Nb site : A paramagnetic Jahn-Teller center in vacuum-reduced LiNbO3:Mg:Ti single crystals. / Corradi, G.; Zaritskii, I. M.; Hofstaetter, A.; Polgár, K.; Rakitina, L. G.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 58, No. 13, 01.10.1998, p. 8329-8337.

Research output: Contribution to journalArticle

Corradi, G. ; Zaritskii, I. M. ; Hofstaetter, A. ; Polgár, K. ; Rakitina, L. G. / Ti3+ on Nb site : A paramagnetic Jahn-Teller center in vacuum-reduced LiNbO3:Mg:Ti single crystals. In: Physical Review B - Condensed Matter and Materials Physics. 1998 ; Vol. 58, No. 13. pp. 8329-8337.
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