Evidence of ferroelastic–ferroelastic phase transition in BiMoxW1−xO6 compounds

Jiménez, Ricardo; Castro, A.; Jiménez, B.

doi:10.1063/1.1613801

Cited by 24 publications

(16 citation statements)

References 25 publications

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“…Unlike previously reported measurements that were dynamically accomplished at 3 K min −1 at a single frequency of 9 Hz, slower measurements at 0.1 K min −1 were carried out at frequencies of 4 and 30 Hz. This technique has been shown to be very suitable for studying phase transitions 33,34 and the dynamics of domain walls in ferroelectrics. 35 Finally, thermal expansion measurements were carried out on the same ceramic bars at 5 K min −1 with a constant force applied of 20 mN.…”

Section: Methodsmentioning

confidence: 99%

Transition between the ferroelectric and relaxor states in0.8Pb(Mg1∕3Nb2∕3)

Jiménez

Carreaud

et al. 2006

Phys. Rev. B

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The phase transition between the ferroelectric and relaxor states for 0.8Pb͑Mg 1/3 Nb 2/3 ͒O 3 -0.2PbTiO 3 ceramics with high chemical homogeneity has been studied by measurements of the dielectric and elastic properties as a function of temperature and of thermal expansion. The room temperature ferroelectric phase structure has been studied in ceramics and powdered samples by Rietveld analysis of x-ray diffraction patterns and by ferroelectric hysteresis loops. Results indicate that the material has well defined, different transition and freezing temperatures, such as the transition is between a monoclinic Cm ferroelectric phase and the nonergodic glass state. The transition presents thermal hysteresis, not only in the transition temperature, but in the kinetics. This indicates that a quite sharp slowing down occurs in the temperature interval between 334 and 344 K: the transition temperatures on cooling and heating.

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Section: Methodsmentioning

confidence: 99%

Transition between the ferroelectric and relaxor states in0.8Pb(Mg1∕3Nb2∕3)

Jiménez

Carreaud

et al. 2006

Phys. Rev. B

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“…[4][5][6] Doping with N, C, and S or transition metals is commonly used to promote visible-light photocatalysis. [21][22][23][24][25][26][27][28] Recently, Bi 2 WO 6 has attracted extensive interest for its good performance in the photocatalytic degradation of organic compounds and the photocatalytic O 2 evolution, respectively, under visible-light irradiation. Therefore, there is an urgent need to develop efficient visible-lightactive photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Nanovoid Bi₂WO₆ 2D Ordered Arrays as Photoanodes for Photoelectrochemical Water Splitting

Zhang

Bahnemann

2013

ChemSusChem

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Herein we report a facile and economic method to prepare nanovoid Bi(2)WO(6) 2D ordered arrays employing a simple self-assembly procedure. The electrochemical properties and performance of the 2D nanoarray as a photoanode for water splitting are investigated and compared with a conventional photoanode of similar thickness. The 2D array photoanode shows a much higher photocurrent density and photon-to-H(2) conversion efficiency even with a small content of the Bi(2)WO(6) material. The enhancement is further studied and explained on the basis of the superiority of light scattering and photogenerated hole diffusion within the 2D array structure. This work provides a facile method to improve the efficiency of solar energy conversion systems by minimizing the charge-carrier diffusion length and reducing the light reflection, as well as reducing the amount of the semiconductor material (often costly and/or rare) present in the photoanode.

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“…Photocatalysis can completely decompose organic pollutants even at low levels in an ambient environment. Bi 2 WO 6 has attracted considerable attention for its physical and chemical properties, such as pyroelectricity, ferroelectricity, piezoelectricity and non–linear dielectric susceptibility1234567. Besides, Bi 2 WO 6 is also a kind of excellent visible–light–driven photocatalysts on the degradation of organic pollutants and water splitting (O 2 evolution)891011121314.…”

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Fabrication of Wide–Range–Visible Photocatalyst Bi2WO6−x nanoplates via Surface Oxygen Vacancies

Yao

Zong

et al. 2016

Sci Rep

179

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Bi2WO6 as a high visible-light-driven catalyst has been aroused broad interest. However, it can only be excitated by the light with λ < 450 nm and the solar energy utilization need to be improved. Here, the wide–range–visible photoresponse Bi2WO6−x nanoplates were fabricated by introducing surface oxygen vacancies through the controllable hydrogen reduction method. The visible photoresponse wavelength range is extended from 450 nm to more than 600 nm. In addition, the photocatalytic activity of Bi2WO6−x is also increased and is 2.1 times as high as that of pristine Bi2WO6. The extending of the photoresponse range and the enhancement of the photoactivity both can be attributed to the surface-oxygen-vacancy states. This is because surface-oxygen–vacancy states generated above and partly overlapping of with the valence band (VB) will result in the rising of valence band maximum (VBM), thus broadening the VB width. This approach is proposed to develop many types of wide–range–visible optical materials and to be applicable to many narrow and wide bandgap materials.

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Evidence of ferroelastic–ferroelastic phase transition in BiMoxW1−xO6 compounds

Abstract: Articles you may be interested inInterband electronic transitions and phase transformation of multiferroic Bi1− x La x Fe1− y Ti y O3 ceramics revealed by temperature-dependent spectroscopic ellipsometry

Cited by 24 publications

References 25 publications

Transition between the ferroelectric and relaxor states in0.8Pb(Mg1∕3Nb2∕3)

Transition between the ferroelectric and relaxor states in0.8Pb(Mg1∕3Nb2∕3)

Synthesis of Nanovoid Bi₂WO₆ 2D Ordered Arrays as Photoanodes for Photoelectrochemical Water Splitting

Fabrication of Wide–Range–Visible Photocatalyst Bi2WO6−x nanoplates via Surface Oxygen Vacancies

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Evidence of ferroelastic–ferroelastic phase transition in BiMoxW1−xO6 compounds

Abstract: Articles you may be interested inInterband electronic transitions and phase transformation of multiferroic Bi1− x La x Fe1− y Ti y O3 ceramics revealed by temperature-dependent spectroscopic ellipsometry

Cited by 24 publications

References 25 publications

Transition between the ferroelectric and relaxor states in0.8Pb(Mg1∕3Nb2∕3)

Transition between the ferroelectric and relaxor states in0.8Pb(Mg1∕3Nb2∕3)

Synthesis of Nanovoid Bi2WO6 2D Ordered Arrays as Photoanodes for Photoelectrochemical Water Splitting

Fabrication of Wide–Range–Visible Photocatalyst Bi2WO6−x nanoplates via Surface Oxygen Vacancies

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Synthesis of Nanovoid Bi₂WO₆ 2D Ordered Arrays as Photoanodes for Photoelectrochemical Water Splitting