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Titolo:
Structural modifications in titania-doped tantalum pentoxide crystals: a Raman scattering study
Autore:
Dobal, PS; Katiyar, RS; Jiang, Y; Guo, R; Bhalla, AS;
Indirizzi:
Univ Puerto Rico, Dept Phys, Rio Piedras, PR 00931 USA Univ Puerto Rico Rio Piedras PR USA 00931 Phys, Rio Piedras, PR 00931 USA Penn State Univ, Mat Res Lab, University Pk, PA 16802 USA Penn State UnivUniversity Pk PA USA 16802 b, University Pk, PA 16802 USA
Titolo Testata:
INTERNATIONAL JOURNAL OF INORGANIC MATERIALS
fascicolo: 2, volume: 3, anno: 2001,
pagine: 135 - 142
SICI:
1466-6049(200103)3:2<135:SMITTP>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
TA2O5 THIN-FILMS; SINGLE-CRYSTAL; DIELECTRIC-CONSTANT; PHASE-TRANSITION; SPUTTERED TA2O5; LASER-ABLATION; SILICON; SPECTRA; SUBSTITUTION; SPECTROSCOPY;
Keywords:
oxides; crystal growth; Raman spectroscopy; phase transactions;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Katiyar, RS Univ Puerto Rico, Dept Phys, Rio Piedras, PR 00931 USA Univ Puerto Rico Rio Piedras PR USA 00931 edras, PR 00931 USA
Citazione:
P.S. Dobal et al., "Structural modifications in titania-doped tantalum pentoxide crystals: a Raman scattering study", INT J INORG, 3(2), 2001, pp. 135-142

Abstract

Tantalum pentoxide (Ta2O5) is promising for coating and piezoelectric applications and has been considered as the dielectric gate material for the next generation of memory devices. In this work, TiO2-doped Ta2O5 crystals were prepared using the laser-heated pedestal growth technique, as grown specimens were found to crystallize in monoclinic phase at room temperature. The structural modifications in these crystals resulting from variation of TiO2 composition (0-11%) and temperature (-248-900 degreesC) were studied using Raman spectroscopy. The low frequency external modes (upsilon < 100 cm(-1)) that originate from the interaction between TaOn5-2 eta/Ta6O12+6 clusters/polyhedra exhibit a strong compositional and temperature dependence in terms of their intensity and frequency variations. The Raman spectral evolutions suggested a monoclinic to orthorhombic structural phase transition at about 327, 397, 487, and 577 degreesC For 0, 5, 8, and 11% TiO2-doped Ta2O5, respectively. (C) 2001 Elsevier Science Ltd. All lights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 01:48:16