High-pressure phase research on Nb2O5

Tamura, Syuzo

doi:10.1007/bf00555631

Cited by 54 publications

(29 citation statements)

References 18 publications

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“…This material was reannealed in air at 1000°C for 1 h to minimize any slight reduction which may have occurred. The B-polymorph of Nb2 0 5 (after Tamura [2)). …”

Section: Sample Preparationmentioning

confidence: 99%

“…1) based on no experimental evidence. S. Tamura [2] reported a temperaturepressure diagram ( fig. 2) for N~05 postulating the boundaries between H-Nb205 and L-Nb20 5 and B-Nb20 5 and L-Nb20 5 based on experiments utilizin g an opposed piston apparatus.…”

Section: Introductionmentioning

confidence: 99%

“…2 The use of psi, bar, and khar foUows the cu rrent co mmon practice of workers in the field. Note th at I bar=IO' N/m' (or pascal)= IO' dyn/ c m'= O.9869 atm= 14.504 psi.…”

Section: Introductionmentioning

confidence: 99%

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Temperature-pressure phase relationships in niobium pentoxide

Waring¹,

Roth²,

Parker³

1973

J. RES. NATL. BUR. STAN. SECT. A.

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A press ure-te mperature (P-T) section of th e phase equilibrium diagram for Nb,O, has bee n determined. Four sin gle phase regions, H-Nb,O" B-N b20" and two L-Nb20, areas, were characteri zed by x-ray powder diffracti on data. The superstru cture of L-Nb,O, w!\s indexed on the basis of similarities to the known superstructures of L-Ta,O, and confirmed with single crystal electron diffraction data_The correct unit cell is orthorhombic with a=6 . 168, b =29.3 12 , c=3.938 A, with the b axis 8 times the subcell (8 x 3.664 A).

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“…This material was reannealed in air at 1000°C for 1 h to minimize any slight reduction which may have occurred. The B-polymorph of Nb2 0 5 (after Tamura [2)). …”

Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Temperature-pressure phase relationships in niobium pentoxide

Waring¹,

Roth²,

Parker³

1973

J. RES. NATL. BUR. STAN. SECT. A.

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“…For instance, it is known that the trigonal L-Nb 2 O 5 Nb phase turns into a monoclinic high-temperature phase H-Nb 2 O 5 close to 900 • C [4]. Also, by heating niobium pentoxide at constant pressure, the sequence of phase transitions H-Nb 2 O 5 → B-Nb 2 O 5 → T-Nb 2 O 5 is observed [5] and, at a constant temperature, it was demonstrated that B-Nb 2 O 5 and T-Nb 2 O 5 constitute high pressure polymorphs of Nb 2 O 5 [6]. Interestingly, it is believed that many of the existent phases should be metastable or, at least, stabilized by impurities [5].…”

Section: Introductionmentioning

confidence: 99%

“…Also, by heating niobium pentoxide at constant pressure, the sequence of phase transitions H-Nb 2 O 5 → B-Nb 2 O 5 → T-Nb 2 O 5 is observed [5] and, at a constant temperature, it was demonstrated that B-Nb 2 O 5 and T-Nb 2 O 5 constitute high pressure polymorphs of Nb 2 O 5 [6]. Interestingly, it is believed that many of the existent phases should be metastable or, at least, stabilized by impurities [5]. A suitable combination of chemical, electronic and optical properties make this oxide useful in various applications [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry

Joya

Barba-Ortega

Raba-Páez

et al. 2017

Metals

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Abstract:In this work, a set of nanoparticles of Nb 2 O 5 nanoparticles were grown by both the Pechini and the sol-gel methods. The amorphous materials were calcined at 650 • C or at 750 • C. X-ray diffraction, scanning electron microscopy, luminescence and Raman spectroscopy were used in order to characterize the materials. From the study, it is possible to state that the method of production of nanoparticles, beyond the temperature of synthesis, has a great influence on whether the phase produced is hexagonal or orthorhombic. Additionally, compared to de Sol-gel method, the Pechini method produced samples with smaller particle sizes. The photoluminescence spectra of niobium pentoxide nanostructure materials show that the emission peaks are positioned between 334 to 809 nm and there is a change of intensity which varies depending on the synthesis route used. High pressure Raman spectra at room temperature were obtained from two samples grown by the sol-gel method. Up to 6 GPa, where it is possible to observe the Raman bands, no modification other than the increase of disorder was observed, and this can be associated with a change of phase.

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Laser‐Assisted Fabrication of Pseudohexagonal Phase Niobium Pentoxide Nanopillars for Lithium Ion Battery Anodes

Liang

Wang

et al. 2019

ChemNanoMat

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Herein, we report a convenient route to fabricate pseudohexagonal phase niobium pentoxide (TT-Nb 2 O 5 ) nanopillars via combination of laser ablation in liquids (LAL) and hydrothermal treatment without using any organic surfactants or stabilizers. The morphology and structure of the assynthesized samples are investigated through scanning and transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Such nanopillars exhibit excel-lent lithium storage properties, including high reversible capacity, good rate capability, and excellent cycle stability (81% capacity retention after 1000 cycles) at a rate of 5 C in the potential range of 1.0 to 3.0 V, which is higher than other previously reported Nb 2 O 5 -based electrode. The synergistic effects from the nanopillar morphology, high electronic conductivity and stable structure promise potential applications in high-security and high-rate capability Li-ion batteries. Scheme 1. Schematic of the synthesis of TT-Nb 2 O 5 nanopillars.

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High-pressure phase research on Nb2O5

Cited by 54 publications

References 18 publications

Temperature-pressure phase relationships in niobium pentoxide

Temperature-pressure phase relationships in niobium pentoxide

Synthesis and Characterization of Nano-Particles of Niobium Pentoxide with Orthorhombic Symmetry

Laser‐Assisted Fabrication of Pseudohexagonal Phase Niobium Pentoxide Nanopillars for Lithium Ion Battery Anodes

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