Phase Relations in the System BiO1.5–YbO1.5–CuO

Chen, X.L.; Zhang, F.F.; Shen, Yan; Liang, J. K.; Tang, W.H.; Tu, Qiansi

doi:10.1006/jssc.1998.7870

Cited by 18 publications

(13 citation statements)

References 13 publications

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“…The main diffraction peaks of BiLa 2 O 4.5 can be indexed using a monoclinic cell with lattice parameters a = 6.8272(6) Å, b = 3.9885(2) Å, c = 4.0523(5) Å, which is consistent with the literature2233. The peaks marked by * belongs to superstructure3334353637, and the hexagonal lattice parameters are a = 31.144 (8) Å, c = 19.782 (2) Å.…”

Section: Resultssupporting

confidence: 80%

A new Bi-based visible-light-sensitive photocatalyst BiLa1.4Ca0.6O4.2: crystal structure, optical property and photocatalytic activity

Zhong

Lou

Jin

et al. 2016

Sci Rep

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A new compound of BiLa1.4Ca0.6O4.2 is synthesized through solid state reaction, where the Ca substitutes, in part, the La site in a stable BiLa2O4.5 phase. The structure of the BiLa1.4Ca0.6O4.2 crystallizes in space group R3mH with a hexagonal lattice constants of a = 3.893(1) Å, c = 9.891(1) Å. Its optical absorption edge is about 2.05 eV, which just spans the visible light region. The photocatalytic activity of the BiLa1.4Ca0.6O4.2 powder to degradation of RhB under visible light irradiation is measured and improved more than 7 times by annealing in nitrogen ambient, indicating that annealing in nitrogen can effectively improve the photocatalytic activity by producing oxygen vacancy. Although the absolute photocatalytic activity obtained is low, there is great potential for enhancing the activity such as nanoscaling, doping, and coupling with other compounds.

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Section: Resultssupporting

confidence: 80%

A new Bi-based visible-light-sensitive photocatalyst BiLa1.4Ca0.6O4.2: crystal structure, optical property and photocatalytic activity

Zhong

Lou

Jin

et al. 2016

Sci Rep

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“…In the YbSB system, Chen et al reported that d-BiO 1.5 persists from x = 0.15 to 0.35 after furnace cooling from synthesis temperatures. 17 However, Zargarova et al 18 published an equilibrium phase diagram in which d-BiO 1.5 spans x = 0.25-0.60. In each of these studies, the secondary phases found at dopant levels below the d-phase stability range differ, especially since the formation of the metastable tetragonal band body-centered cubic (I23) g-polymorphs in slightly doped BiO 1.5 is highly dependent on cooling history.…”

Section: Discussionmentioning

confidence: 99%

Energetics of disordered and ordered rare earth oxide-stabilized bismuth oxide ionic conductors

Tran

Navrotsky

2014

Phys. Chem. Chem. Phys.

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Rare-earth stabilized bismuth oxides are known for their excellent ionic conductivity at intermediate temperatures. However, previous studies have shown that their conductivity deteriorates during extended heat treatments at 500-600 °C, although the fluorite phase is maintained. In this study, the enthalpies of formation of quenched and aged ytterbia- and dysprosia-stabilized bismuth oxides were measured using high-temperature oxide melt solution calorimetry in 3Na2O-4MoO3 solvent at 702 °C. While a modest energy difference (-2 to -3 kJ mol(-1)) drives the kinetically slow aging transformation in the ytterbia-stabilized system at moderate dopant contents, no energetic driving force is detectable in the dysprosia-stabilized system. Although the small magnitude of the exothermic ordering energy suggests extensive short range ordering in both the quenched and aged samples, the anion configuration specific to the aged samples is nevertheless responsible for the significant decrease in conductivity.

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“…The latter is a high temperature variant which can be retained down to room temperature by doping with transition elements, and lanthanides. In this work, the best fit was obtained using the structural model developed by Chen et al [8] (an Fm3m cubic structure, with 0.54201 nm cell parameter) in the resolution of the structure of the solid solution Bi 2 O 3 -Yb 2 O 3 . The refinement of the Aurivillius phase Bi 3 TiNbO 9 was started with the Nalini et al [9] model with A2 1 am orthorhombic structure and a=0.54248 nm, b=0.53864 nm, c=2.50392 nm cell parameters.…”

Section: Methodsmentioning

confidence: 99%

Structural analysis of Bi₃TiNbO₉prepared by mechanical activation

Lara¹,

Serafini²,

Romero³

et al. 2008

J. Phys.: Conf. Ser.

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Abstract. The synthesis by high energy mechanical activation and structural characterization of the phases of Bi 3 TiNbO 9 are described. A fluorite-like metastable phase was identified upon heating the activated powders in the temperature range of 593 to 823 K, followed by formation of the stable Aurivillius phase above 873 K. The crystallization temperature of the fluorite phase increases with milling time. From Rietveld analysis of X-ray diffraction patterns, the fluorite cell parameter is shown to decrease, while rutile TiO 2 increases with milling time IntroductionThe mechanical activation of the powder precursors in the system Bi 2 O 3 -TiO 2 -Nb 2 O 5 allows for the formation of a stable Aurivillius Bi 3 TiNbO 9 (BTN) phase, with a high Curie temperature (~ 1213K) that provides for piezoelectric ceramics at high temperature [1,2]. Sintering at low temperature leads to a metaestable fluorite phase, which shows a great sensitivity to humidity, as has been reported by our group [3].Dense ceramics on this system were prepared by mechanical activation as reported in the work of Moure et al. [4,5], using low energy milling. Amorphous precursors were obtained with this technique after milling for 3000 h. The free energy stored in crystalline damage and continuous surface creation 0 are understood as the resource that greatly diminishes the subsequent new crystalline phase formation temperatures.In this report, high energy ball milling was used to obtain amorphous precursor powders. X ray diffraction and Rietveld analysis were used for crystalline structure determination. Thermal stability and phase transformations in the BTN system were analyzed as functions of milling time.

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Phase Relations in the System BiO1.5–YbO1.5–CuO

Cited by 18 publications

References 13 publications

A new Bi-based visible-light-sensitive photocatalyst BiLa1.4Ca0.6O4.2: crystal structure, optical property and photocatalytic activity

A new Bi-based visible-light-sensitive photocatalyst BiLa1.4Ca0.6O4.2: crystal structure, optical property and photocatalytic activity

Energetics of disordered and ordered rare earth oxide-stabilized bismuth oxide ionic conductors

Structural analysis of Bi₃TiNbO₉prepared by mechanical activation

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Phase Relations in the System BiO1.5–YbO1.5–CuO

Cited by 18 publications

References 13 publications

A new Bi-based visible-light-sensitive photocatalyst BiLa1.4Ca0.6O4.2: crystal structure, optical property and photocatalytic activity

A new Bi-based visible-light-sensitive photocatalyst BiLa1.4Ca0.6O4.2: crystal structure, optical property and photocatalytic activity

Energetics of disordered and ordered rare earth oxide-stabilized bismuth oxide ionic conductors

Structural analysis of Bi3TiNbO9prepared by mechanical activation

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Structural analysis of Bi₃TiNbO₉prepared by mechanical activation