Crystal growth, structure, electron paramagnetic resonance and magnetic properties of (NH4)2V3O8

Théobald, F.; Theobald, Jean‐Gérard; Védrine, J.C.; Clad, R.; Renard, J.

doi:10.1016/0022-3697(84)90050-7

Cited by 41 publications

(19 citation statements)

References 6 publications

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“…Figure 2a shows the powder XRD pattern of the product, which matchs well with the XRD patterns of previously reported (NH 4 ) 2 V 3 O 8 (tetragonal P4bm, JCPDF file no. 23-790 and 84-972) [4,5]. The calculated cell parameters are a = 8.891 Å, c = 5.582 Å, which are comparable with those reported data.…”

Section: Resultssupporting

confidence: 79%

“…Diammonium trivanadate, (NH 4 ) 2 V 3 O 8 , was discovered by Brierley [8] about 120 years ago, and the crystal system and cell dimensions have been known [5,9]. The previous reported methods for the synthesis of (NH 4 ) 2 V 3 O 8 mainly involve chemical or electrochemical reduction of V 2 O 5 in ammonium salt solutions [4,5,10,11]. (NH 4 ) 2 V 3 O 8 was also prepared by solid state reactions between NH 4 VO 3 and V 2 O 3 [6].…”

Section: Introductionmentioning

confidence: 99%

“…Mixed-valence vanadate A 2 V 3 O 8 family (A = K [1], Rb [2], Tl [3], NH 4 [4,5]) is of fresnoite-type vanadium oxides, which have attracted much attention due to their novel low-temperature magnetic properties [5][6][7]. They have a fresnoite (Ba 2 TiSi 2 O 8 ) structure that consists of layers of corner-sharing VO 5 square pyramids and VO 4 tetrahedra with A ions lying between the layers.…”

Section: Introductionmentioning

confidence: 99%

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Crystal growth of mixed‐valence ammonium vanadates

Ren

Yuan

Zou³

2007

Cryst. Res. Technol.

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A new method has been developed for the synthesis of mixed-valence ammonium vanadate crystals. Single crystals of (NH 4 ) 2 V 3 O 8 were synthesized on a large scale by hydrothermal reduction of NH 4 VO 3 in ethanol-H 2 O solutions in the presence of triblock copolymer Pluronic P123. The crystals are shining thin plates with (001) cleavage planes. Calcination of the (NH 4 ) 2 V 3 O 8 crystals at 300°C or above resulted in pure phases of V 2 O 5 .

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Section: Resultssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Crystal growth of mixed‐valence ammonium vanadates

Ren

Yuan

Zou³

2007

Cryst. Res. Technol.

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“…Diammonium trivanadate (NH 4 ) 2 V 3 O 8 crystallizes as a fresnoite structure and attracts much attention due to its magnetic properties [16,17]. Ammonium vanadium bronze, NH 4 V 4 O 10 (or (NH 4 ) 0.5 V 2 O 5 ) has a monoclinic structure.…”

Section: Introductionmentioning

confidence: 99%

Structural hierarchy of NH4V3O7 particles prepared under hydrothermal conditions

Захарова¹,

Liu²,

Popov³

et al. 2015

Nanosist.: fiz. him. mat.

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Despite having simple stoichiometry, NH 4 V 3 O 7 still remains an odd compound with poorly resolved structure among the series of known ammonium vanadates. Here, a new hydrothermal synthesis of the product with explicit NH 4 V 3 O 7 stoichiometry is evaluated. Intricate microstructure of the product is revealed as an aggregate of spherical microparticles consisting of microplatelets via scanning electron microscopy. To further guide the characterization of the NH 4 V 3 O 7 phase, X-ray diffraction analysis and first-principle calculations were carried out to refine the structure at an atomistic level and to predict electronic properties. The results suggest a complex structural hierarchy with consequent nanodomain organization of prepared NH 4 V 3 O 7 microplatelets.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Layerstructured vanadium pentoxide is one of the most studied vanadium oxides despite its low discharge voltages, low electric conductivity, and slow diffusion kinetics of lithium ions. [6][7][8][9][10][11][12][13] In order to improve the performance of lithium batteries by employing vanadium pentoxide as a cathode material, a few methods have been used to prepare vanadium pentoxide with better characteristics, which includes the use of aerogels, xerogels, nanocomposites of LiV 2 O 5 with electronically conducting organic polymers and nanostructured materials.…”

mentioning

confidence: 99%

Simple Preparation of V₂O₅Nanostructures and Their Characterization

Reddy¹,

Park²,

Mho³

et al. 2008

Bulletin of the Korean Chemical Society

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Low-dimensional nanostructures of vanadium oxides and their derivatives have attracted a great deal of interests due to their novel physicochemical properties and potential applications to high-energy lithium batteries, chemical sensors, nanoresonators, and field effect transistors.1-19 Layerstructured vanadium pentoxide is one of the most studied vanadium oxides despite its low discharge voltages, low electric conductivity, and slow diffusion kinetics of lithium ions.6-13 In order to improve the performance of lithium batteries by employing vanadium pentoxide as a cathode material, a few methods have been used to prepare vanadium pentoxide with better characteristics, which includes the use of aerogels, xerogels, nanocomposites of LiV 2 O 5 with electronically conducting organic polymers and nanostructured materials.9-12 There have been a few recent attempts to develop synthetic methods for nanomaterials of vanadium oxides but preparation of single-crystal vanadate nanostructures still remains challenging. Generally, nanomaterials are prepared in acidic media 2-5 but very few studies report their synthesis using basic media.17 Here, we report synthesis of nanosized vanadium oxides by thermal decomposition of ammonium vanadate nanomaterials prepared via refluxing and precipitation methods in both basic and acidic media. ExperimentalNanosized ammonium vanadates (samples 1, 2, and 3) were synthesized from solutions of vanadium pentoxide dissolved in aqueous ammonium solutions using a few different procedures. Crystallographic information was obtained from X-ray diffraction (XRD) data collected over the 2θ range of 2 to 70 o by a Rigaku D-max-γA powder diffractometer equipped with Cu Kα radiation (λ = 1.54187 Å). Raman spectra were acquired under ambient conditions by using a Bruker IFS/66 Raman spectrophotometer with an Ar + laser operating at 514 nm used as an excitation source. The morphologies of the resulting products were characterized using a FESEM model JSM 6700F field-emission scanning electron microscope. Electrochemical properties of the nanomaterials were investigated in a three-electrode cell with a platinum counter electrode and a silver (Ag) wire pseudo-reference electrode; the working electrode was prepared by first mixing 75% of an active nanostructured material, 20% of carbon black, and 5% of ethylene cellulose and then coating the total mixture of 5.0 mg on the surface of a 1.5 cm 2 ITO glass using a similar technique used for screen printing (V 2 O 5 nanomaterial of 2.5 mg/cm 2 ). A 1.0 M lithium perchlorate solution in propylene carbonate was used as the electrolyte; lithium perchlorate (99.99%, Aldrich) and propylene carbonate (99.7%, Aldrich) were used after recrystallization and distillation, respectively. Cyclic voltammograms (CVs) were recorded at a scan rate of 10 mV/s in a potential limit of −1.0 V and +1.0 V versus a Ag reference electrode using a Zahner IM6 potentiostat/galvanostat. Results and DiscussionThe XRD patterns of the ammonium vanadate and vanadium oxide nanomaterials are sho...

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Crystal growth, structure, electron paramagnetic resonance and magnetic properties of (NH4)2V3O8

Cited by 41 publications

References 6 publications

Crystal growth of mixed‐valence ammonium vanadates

Crystal growth of mixed‐valence ammonium vanadates

Structural hierarchy of NH4V3O7 particles prepared under hydrothermal conditions

Simple Preparation of V₂O₅Nanostructures and Their Characterization

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Crystal growth, structure, electron paramagnetic resonance and magnetic properties of (NH4)2V3O8

Cited by 41 publications

References 6 publications

Crystal growth of mixed‐valence ammonium vanadates

Crystal growth of mixed‐valence ammonium vanadates

Structural hierarchy of NH4V3O7 particles prepared under hydrothermal conditions

Simple Preparation of V2O5Nanostructures and Their Characterization

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Simple Preparation of V₂O₅Nanostructures and Their Characterization