Effect of processing method on physical properties of Nb2O5

Soares, M.R.; Leite, Sara Vilhena Martins de Almeida; Nico, C.; Peres, M.; Fernandes, A.J.S.; Graça, M.P.F.; Matos, M.; Monteiro, R.; Monteiro, T.; Costa, F.M.

doi:10.1016/j.jeurceramsoc.2010.10.024

Cited by 67 publications

(49 citation statements)

References 19 publications

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“…Both spectra shown, with peaks at ∼ 235, ∼ 315, and ∼ 700 cm −1 , are in excellent agreement with those reported in the literature for T-Nb 2 O 5 . [8,21,22] The two low wave-number peaks have been loosely ascribed to Nb-O-Nb bending modes and that at ∼700 cm −1 to Nb-O stretching modes. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Rapid and controlled electrochemical synthesis of crystalline niobium oxide microcones

et al. 2015

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We demonstrate the fabrication by anodization of niobium oxide microcones, several microns long, from aqueous solutions of 1 wt% hydrogen fluoride (HF) with varied sodium fluoride (NaF) concentration (0-1 M). Raman spectroscopy and x-ray diffractometer analysis revealed the as-grown microcones to be crystalline Nb 2 O 5−x with preferred (1 0 0) and (0 1 0) orientations. The overall Nb 2 O 5−x formation rate increased with the increasing NaF concentration, and structures as tall as 20 μm were achieved in just 20 min of anodization at 1 M NaF. Rapid formation of niobia microcones was even observed in the absence of HF at this NaF concentration. Photocatalytic activity for water oxidation was highest for microcones grown under the highest NaF concentration.

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Section: Resultsmentioning

confidence: 99%

Rapid and controlled electrochemical synthesis of crystalline niobium oxide microcones

et al. 2015

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“…In general the crystallization conditions of each Nb 2 O 5 structure depends on the starting materials, synthesis methods and heat treatment conditions. In particular the T-Nb 2 O 5 net parameters are: a = 6.17Å; b = 29.32Å; c = 3.94Å, and its crystalline structures consist of 4 × 4 blocks of corner-shared NbO 6 octahedra, with connected blocks sharing the edges of the octahedron 11 .…”

Section: Introductionmentioning

confidence: 99%

“…Soares et al 11 reported the synthesis of Nb 2 O 5 samples by means of the Laser Floating Zone (LFZ) technique and the solid-state reaction in order to study some of their physical properties as a function of synthesis conditions. The authors found a structural orthorhombic to monoclinic phase transition observed in samples sintered at temperatures higher than 800°C.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structural Properties of Niobium Pentoxide Powders: A Comparative Study of the Growth Process

2016

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Powders Nb 2 O 5 were prepared by two different synthesis method, Sol-Gel and polymeric precursors (Pechini). In the Pechini method before adding the citric acid in the process, four different solutions were used to get the samples. For Sol-gel method, two different processes were also used in obtaining powders. The precursor was completely solubilized in ethanol and then hydrolyzed with ammonia and water. The calcination of the samples was between 500 and 750°C. The resulting powders were characterized by Scanning Electron Microscopy (SEM), Brunauer, Emmett and Teller (BET) surface area measurements, UV-visible and Raman spectroscopy. The formation of T−Nb 2 O 5 orthorhombic took place upon calcination at 7500C. Crystallite sizes were determined using the Scherrer method which resulted in an uniformed size of about 25 − 65nm. Ultraviolet-Visible diffuse reflectance spectroscopy indicated a variation in the optical band gap values (3.32-3.40 eV) in crystal growth process. The Raman vibrational modes indicate the presence of the orthorhombic phase of the material.

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“…It is known that Nb forms different stable oxides such NbO, NbO 2 and Nb 2 O 5 , that exhibit very distinct electrical properties: NbO presents a typical metallic behaviour, Nb 2 O 5 is a wide band gap semiconductor (3.4-5.3 eV), and Nb 12 O 29 (which has a stoichiometry very close to Nb 2 O 5 ) can be a good transparent conductive oxide (TCO) [1][2][3][4][5]. More recently, niobium oxides have been explored for the development of resistive memories due to their resistive switching mechanisms based on the presence of oxygen vacancies [6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effects of Zr and Ga doping on the stoichiometry and properties of niobium oxides

Nico

Soares

Costa

et al. 2016

Ceramics International

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Effect of processing method on physical properties of Nb2O5

Cited by 67 publications

References 19 publications

Rapid and controlled electrochemical synthesis of crystalline niobium oxide microcones

Rapid and controlled electrochemical synthesis of crystalline niobium oxide microcones

Synthesis and Structural Properties of Niobium Pentoxide Powders: A Comparative Study of the Growth Process

Effects of Zr and Ga doping on the stoichiometry and properties of niobium oxides

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