Phonon mode and phase transition behaviors of (1-<i>x</i>)PbSc1/2Ta1/2O3-<i>x</i>PbHfO3 relaxor ferroelectric ceramics determined by temperature-dependent Raman spectra

Zhang, W. J.; Li, Wenwu; Chen, X. G.; Hu, Zhigao; Liu, Wei; Wang, G. S.; Dong, Xianlin; Chu, Junhao

doi:10.1063/1.3614431

Cited by 11 publications

(3 citation statements)

References 23 publications

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“…Photo-generated (e − -h + )-pairs participate in an important part for solar energy transfer method, for example, solar H 2 O splitting, CO 2 reduction, and photocatalytic pollutant degradation. Although photo-generated carriers in excited states are less stable, they recombine easily, which results in low conversion effectiveness of photocatalysis [30]. By the way, since discovery of photo-catalytic H 2 O splitting with TiO 2 in 1972, great effort was applied in progress of photo-catalysts for an efficient photo-catalytic method [31].…”

Section: General Selection Of Sc Photo-catalytic Materialsmentioning

confidence: 99%

Recent Progress, Challenges, and Prospects in Two-Dimensional Photo-Catalyst Materials and Environmental Remediation

et al. 2020

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The successful photo-catalyst library gives significant information on feature that affects photo-catalytic performance and proposes new materials. Competency is considerably significant to form multi-functional photo-catalysts with flexible characteristics. Since recently, two-dimensional materials (2DMs) gained much attention from researchers, due to their unique thickness-dependent uses, mainly for photo-catalytic, outstanding chemical and physical properties. Photo-catalytic water splitting and hydrogen (H2) evolution by plentiful compounds as electron (e−) donors is estimated to participate in constructing clean method for solar H2-formation. Heterogeneous photo-catalysis received much research attention caused by their applications to tackle numerous energy and environmental issues. This broad review explains progress regarding 2DMs, significance in structure, and catalytic results. We will discuss in detail current progresses of approaches for adjusting 2DMs-based photo-catalysts to assess their photo-activity including doping, hetero-structure scheme, and functional formation assembly. Suggested plans, e.g., doping and sensitization of semiconducting 2DMs, increasing electrical conductance, improving catalytic active sites, strengthening interface coupling in semiconductors (SCs) 2DMs, forming nano-structures, building multi-junction nano-composites, increasing photo-stability of SCs, and using combined results of adapted approaches, are summed up. Hence, to further improve 2DMs photo-catalyst properties, hetero-structure design-based 2DMs’ photo-catalyst basic mechanism is also reviewed.

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Section: General Selection Of Sc Photo-catalytic Materialsmentioning

confidence: 99%

Recent Progress, Challenges, and Prospects in Two-Dimensional Photo-Catalyst Materials and Environmental Remediation

et al. 2020

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“…Both IR and Raman spectroscopy are sensitive to nanoscopic order and powerful in investigating structural and phonon behavior of oxide materials with perovskite structure. 19 For instance, IR and Raman spectra of ferroelectric ceramic and single crystal [PZT, Pb(Zn 1=3 Nb 2=3 )O 3 -PbTiO 3 etc.] near morphotropic phase boundary (MPB) have been studied to define the local and macroscopic symmetries divergence and identify the boundaries among rhombohedral, monoclinic, and tetragonal phases.…”

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confidence: 99%

Temperature dependent Raman scattering and far-infrared reflectance spectra of MgO modified Pb0.99(Zr0.95Ti0.05)0.98Nb0.02O3 ceramics: A composition effect

Duan

Chang

et al. 2014

Journal of Applied Physics

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Lattice dynamics and phase transition of MgO modified Pb 0.99 (Zr 0.95 Ti 0.05) 0.98 Nb 0.02 O 3 (PZTN-x wt. % MgO, x ¼ 0, 0.1, 0.2, 0.5) ceramics have been investigated by far-infrared (FIR) reflectance in the temperature range of 5.5-300 K and Raman spectra between 77 and 300 K, respectively. With the aid of above complementary methods, the structure of all ceramics was defined as lowtemperature ferroelectric rhombohedral phase [F RðLTÞ ] at room temperature. The FIR dielectric functions were extracted from the multi-Lorentz oscillator dispersion model. The lowest frequency phonon mode, which is related to Pb-BO 3 (B ¼ Zr, Ti, Nb) vibration, mainly dominates the FIR dielectric response. With increasing MgO composition, the dielectric constants eð0Þ at room temperature are estimated to 85.4, 73.4, 73.9, and 41.9, respectively. The decreasing trend can be due to the doubly ionized oxygen vacancies induced by Mg substitution for B-site. The order-disorder phase transition located around 120 K can be clearly clarified from temperature evolution of phonon frequency, damping, and intensity. It decreases slightly with increasing MgO composition, which influence the distortion due to the broken correlation chains and local permanent dipoles creation. Moreover, the transformation from antiferroelectric orthorhombic A O to ½F RðLTÞ phase has been observed around 250 K, which is associated with the antiferroelectric displacement of Pb atoms along h110i and coupled rotations of the corner-connected oxygen octahedral. Furthermore, the transition from ½F RðLTÞ to ½F RðHTÞ (high-temperature ferroelectric rhombohedral phase) was identified around 290 K for MgO-doped PZTN ceramics. It arises from the shift of cation (Pb and Zr/Ti/Nb/Mg ions) along the h111i direction and the transition temperature slightly decreases compared to the pure ceramic. V

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“…Therefore, the application of Raman spectroscopy by analyzing lattice vibration is acceptable include strain effects, textures, x-ray amorphous phases, and superlattice-related features, etc. 14,15 In this letter, a complete set of temperature-induced optical phonon modes in spinel CFO films have been investigated by Raman spectroscopy.…”

mentioning

confidence: 99%

Temperature dependent phonon Raman scattering of highly a-axis oriented CoFe2O4 inverse spinel ferromagnetic films grown by pulsed laser deposition

Liao

et al. 2012

Applied Physics Letters

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Lattice vibrations of highly a-axis oriented CoFe 2 O 4 (CFO) films have been investigated by Raman scattering in the temperature range of 80-873 K. The five phonon modes T 1g (2), T 1g (3), E g , A 1g (1), A 1g (2), and their evolutions can be uniquely distinguished. It was found that an electron transfer between Co 2þ and Fe 3þ cations occurs in octahedral sites at about 173 K. The structure disorder in the CFO films appears with increasing the temperature, which indicates the cation migration between tetrahedral and octahedral sites. The phenomena suggest the structural transformation trend from inverse spinel to normal spinel at the elevated temperatures. V

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Phonon mode and phase transition behaviors of (1-x)PbSc1/2Ta1/2O3-xPbHfO3 relaxor ferroelectric ceramics determined by temperature-dependent Raman spectra

Cited by 11 publications

References 23 publications

Recent Progress, Challenges, and Prospects in Two-Dimensional Photo-Catalyst Materials and Environmental Remediation

Recent Progress, Challenges, and Prospects in Two-Dimensional Photo-Catalyst Materials and Environmental Remediation

Temperature dependent Raman scattering and far-infrared reflectance spectra of MgO modified Pb0.99(Zr0.95Ti0.05)0.98Nb0.02O3 ceramics: A composition effect

Temperature dependent phonon Raman scattering of highly a-axis oriented CoFe2O4 inverse spinel ferromagnetic films grown by pulsed laser deposition

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