Change in the structure of niobium pentoxide due to mechanical and thermal treatments

Ikeya, Tomohiko; Senna, Mamoru

doi:10.1016/0022-3093(88)90313-4

Cited by 107 publications

(64 citation statements)

References 19 publications

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“…eV, which is a bit lower than observed for Nb2O5 [26,27] Raman and IR spectroscopy [30][31][32]. Note also for comparison that the NbO2 phase showed transverse optical phonons below ~ 700 cm -1 [33], which would correspond to surface phonon frequencies of 807 cm -1 as calculated in [29].…”

Section: Methodsmentioning

confidence: 70%

Preparation and structure of alumina supported niobia model catalysts

et al. 2007

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Abstract.Niobia/alumina model catalysts were prepared by physical vapor deposition of Nb in an oxygen atmosphere onto thin alumina films. Structural characterization, performed with scanning tunneling microscopy and infrared reflection absorption spectroscopy, revealed highly dispersed N 2 O 5 nanoparticles exposing Nb=O groups. Thermal stability of the system was also examined. The results are compared with those obtained on thin niobia films and previously studied vanadia/alumina systems.

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Section: Methodsmentioning

confidence: 70%

Preparation and structure of alumina supported niobia model catalysts

et al. 2007

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“…These bands are generally broad and show multiple structures due to distortion of the octahedra. Ikeya and Senna observed similar modes in the high-wavenumber region Raman spectra of H-Nb 2 O 5 12. In addition to the high-wavenumber Raman bands, many sharp peaks (135, 124, 114, 106, 75 and 56 cm 1 ) were observed below 200 cm 1 .…”

mentioning

confidence: 66%

Micro‐Raman scattering in Nb₂O₅–TiO₂ ceramics

Dobal

Dixit

Katiyar

et al. 2002

J Raman Spectroscopy

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Single-phase (Nb 2 O 5 ) 1−x (TiO 2 ) x ceramics were prepared for x = 0.00, 0.05, 0.08 and 0.11 compositions using a solid-state reaction technique. The effect of TiO 2 substitution on the vibrational and phase transition behavior of Nb 2 O 5 was studied using the micro-Raman scattering technique and compared with similar results on Ta 2 O 5 . The external modes resulting from interaction among various polyhedra were observed and vibrational changes were studied in the temperature range −200 to 1100 • C. An increase in structural disorder was reflected in the Raman spectra with increasing TiO 2 content in both Nb 2 O 5 and Ta 2 O 5 . Ta 2 O 5 shows a phase transition at about 300 • C . However, a low-temperature phase transition was observed about 50 • C from (Nb 2 O 5 ) 1−x (TiO 2 ) x compositions.

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“…the samples, taken in seven-minute intervals, would represent the mixture of reacting components and reactional products nSeO 2 #nNa 2 CO 3 #(n!1)Na 2 SeO 3 , [2] where 0(n(1. If the sample is treated by diluted HCl in the Schreters vessel, the following reaction will take place:…”

Section: Methodsmentioning

confidence: 99%

“…During mechanochemical treatment, regardless of applied processing device, the material is comminuted, the size of crystals is reduced, and crystal structure is deformed and damaged, often resulting in partial or complete amorphization (1)(2)(3).…”

Section: Introductionmentioning

confidence: 99%