Shape-controlled synthesis and characterization of BaZrO3 microcrystals

Lu, Zhouguang; Tang, Yougen; Chen, Limiao; Li, Yadong

doi:10.1016/j.jcrysgro.2004.02.107

Cited by 82 publications

(55 citation statements)

References 35 publications

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“…The FT-Raman spectra consists of a band at three photon lines at around 85, 135, and 766 cm -1 that are ascribed to TO1, TO2, and TO4 first-order modes, respectively, and the second-order modes are ascribed at 222 and 556 cm -1 . In addition, the shifts at 153, 689 and 1,059 cm -1 (the BaCO 3 reference sample) as well as the vibrational mode correspond to distortions on the octahedral site of the zirconium inside the unit cell of the BZ structure [44].…”

Section: Resultsmentioning

confidence: 97%

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Aguiar

Simões

Paskocimas

et al. 2015

J Mater Sci: Mater Electron

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A hydrothermal (HTMW) microwave method was used to synthesize ordered-disordered BaZrO 3 (BZ) nanoparticles at temperature of 140°C with times ranging from 15 min to 2 h. X-ray diffraction results verified the formation of BZ crystallites at a soaking time of 2 h while infrared data showed no traces of carbonate. Field emission scanning microcopy revealed a homogeneous size distribution of nanometric BZ powders. HTMW produced nanoparticles of pure BZ phase, with a size ranging from 40 to 80 nm. These results are in agreement with Raman scattering values which show that the HTMW synthesis route is rapid and cost effective. This method could be used as an alternative to obtain BZ nanoparticles as compared to other chemical methods. Intense photoluminescence in disordered BZ powders was observed at room temperature. The key of mystery of the intense PL emission is related to order-disorder structural in BZ lattice.

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Section: Resultsmentioning

confidence: 97%

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Aguiar

Simões

Paskocimas

et al. 2015

J Mater Sci: Mater Electron

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“…Lu et al also observed truncated rhombic and hexagonal perovskite-structured BaZrTiO 3 by ethanol introduction to the solutions. They indicated that the selective polarity-impact on various crystallographic facets of BaZrTiO 3 presumably changes the crystal growth orientation and results in heavily truncated bound by introduction of ethanol [22]. We can deduce that the different morphology and size of Mg 2 SnO 4 / SnO 2 composites by adjusting ethanol/water ratios are also closely related to the polarity-impact changing by more ethanol introduction into the solvent, since the different surface energies of different crystallographic planes in perovskite-structured MgSn(OH) 6 crystal.…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis and photocatalytic performance of Mg2SnO4/SnO2 heterostructures

et al. 2015

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Highly crystalline MgSn(OH) 6 cubic and polyhedral nanoparticles were synthesized via hydrothermal method by adjusting the ethanol/water ratio. Mg 2 SnO 4 / SnO 2 nanoparticles have been successfully obtained by subsequent calcining, which maintain the original morphologies of the precursor with shrank size and rough surface. The structural properties of Mg 2 SnO 4 /SnO 2 heterostructures were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis absorption spectroscopy, and N 2 adsorption/desorption isotherms. The photocatalytic activity of the Mg 2 SnO 4 / SnO 2 nanoparticles was further evaluated by the degradation of methylene blue (MB) under UV illumination. The obtained results revealed that Mg 2 SnO 4 /SnO 2 polyhedral nanoparticles have excellent performance on photocatalytic degradation of MB. It is assumed that the red shift of band gap, oxygen vacancies, and higher specific surface areas of polyhedral Mg 2 SnO 4 /SnO 2 nanocomposites contribute to the enhancement in the photocatalytic activity.

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“…This material is chemically and thermally stable 4,5 , as well as their optical properties were observed under different circumstances, since quasi-amorphous compounds 6 through quasi-crystalline systems 6,7 and finally to periodic crystals 8,9 . BZO presents cubic perovskite sym- metry with ZrO 6 octahedral and BaO 12 cubooctahedral clusters.…”

Section: Introductionmentioning

confidence: 99%

Fingerprints of short-range and long-range structure in BaZr_1−xHf_xO₃ solid solutions: an experimental and theoretical study

Fassbender

Lilge

Cava

et al. 2015

Phys. Chem. Chem. Phys.

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Microwave-assisted hydrothermal method was applied to synthesize BaZr 1−x Hf x O 3 , (BZHO) solid solutions at low temperature, 140 • C, and relative short times, 160 min. The detailed features of the crystal structure, at both short and long ranges, as well as the crystal chemistry doping process, are extensively analysed. X-ray diffraction measurements and Raman spectroscopy have been used to confirm that pure and Hf-doped BZO materials present a cubic structure. Extended X-ray absorption fine structure (EXAFS) indicate that Hf 4+ ions has replaced the Zr 4+ ions on the 6-fold coordination and a subsequent change on the Ba 2+ 12-fold coordination can be sensed. X-ray absorption near-edge spectroscopy (XANES) measurements reveal a local symmetry breaking process, associated to overlap of the 4d -2p and 5d -2p orbitals of Zr-O and Hf-O bonds, respectively. Field emission gun (FE-SEM) and high resolution transmission electron microscope (HRTEM) show the mesocrystalline nature of self-assembled BZHO nanoparticles under dodecahedron shape. In addition were performed first principle calculations to complement experimental data. The analysis of the band structures and density of states of undoped BZO and doped BZHO host lattice allow a deep insight on the main electronic features. The theoretical results help us to find a correlation between simulated and experimental Raman modes and allow a more substantial interpretation of crystal structure.

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Shape-controlled synthesis and characterization of BaZrO3 microcrystals

Cited by 82 publications

References 35 publications

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Facile synthesis and photocatalytic performance of Mg2SnO4/SnO2 heterostructures

Fingerprints of short-range and long-range structure in BaZr_1−xHf_xO₃ solid solutions: an experimental and theoretical study

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Shape-controlled synthesis and characterization of BaZrO3 microcrystals

Cited by 82 publications

References 35 publications

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Facile synthesis and photocatalytic performance of Mg2SnO4/SnO2 heterostructures

Fingerprints of short-range and long-range structure in BaZr1−xHfxO3 solid solutions: an experimental and theoretical study

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Fingerprints of short-range and long-range structure in BaZr_1−xHf_xO₃ solid solutions: an experimental and theoretical study