Structure, thermal stability and electrical conductivity of CaMoO4+δ

Im, Ha‐Ni; Choi, Min Sun; Jeon, Sang-Yun; Song, Sun-Ju

doi:10.1016/j.ceramint.2010.08.004

Cited by 16 publications

(4 citation statements)

References 19 publications

(15 reference statements)

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“…The constituent element core levels are shown in Figures – and Figure S3. As to the initial surface state, the binding energy values of the representative levels Mo 3d 5/2 and Eu 3d 5/2 fall in the ranges typically observed in Mo 6+ - and Eu 3+ -containing oxides. − Generally, the intensity of the element core levels increases on the bombardment time increase because of contaminated top-surface layer sputtering. As to Mo 3d doublet behavior, however, the appearance of two new components is evident at longer bombardment times and this effect is related to the generation of Mo 5+ and Mo 4+ states due to a partial oxygen loss from the surface.…”

Section: Resultsmentioning

confidence: 88%

“…As to Mo–O chemical bonding effects, these were previously considered in ref ., where the diagram related to the ΔMo 3d5/2 = BE(O 1s – Mo 3d 5/2 ) and mean bond length L (Mo–O) was depicted. The coordination of Mo 6+ ions in α-Eu 2 (MoO 4 ) 3 may be considered as tetrahedral and, then, value L (Mo–O) = 180.3 pm can be calculated. , From the XPS measurements carried out in the present study, we have ΔMo 3d5/2 = 297.9 eV.…”

Section: Resultsmentioning

confidence: 99%

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Exploration of the Electronic Structure of Monoclinic α-Eu₂(MoO₄)₃: DFT-Based Study and X-ray Photoelectron Spectroscopy

et al. 2016

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The powder α-Eu 2 (MoO 4 ) 3 sample was prepared by the solid-state reaction method. The phase purity of the final powder product was verified by X-ray diffraction analysis. The constituent element core levels and valence band are measured by X-ray photoelectron spectroscopy as a function of Ar + ion (2.5 keV, 7−8 μA/cm 2 ) bombardment time. The formation of Mo 5+ and Mo 4+ states at high bombardment times was detected. The Eu−O and Mo−O bonding was considered in comparison with other Eu 3+ -and Mo 6+ -containing oxides using binding energy difference parameters. The transparency range obtained for the pure α-Eu 2 (MoO 4 ) 3 tablet is λ = 0.41−0.97 μm, as estimated at the transmission level of 5%. The short-wavelength cut edge in α-Eu 2 (MoO 4 ) 3 is governed by the direct allowed optical transitions within the band gap of E g = 3.74 eV (300 K). The band structure of α-Eu 2 (MoO 4 ) 3 was calculated by ab initio methods and strongly different results were obtained for the spin up/down configurations. The Eu-4f states are located around 2.2 eV and −4.0 eV for spin up (↑) and the structures situated at around 6.5 and 5.5 eV for spin down (↓) configuration. The calculated spin magnetic moments are in excellent relation to the Slater-Pauling rule and within the Eu sphere the magnetic moment of 4f electrons is ∼5.99 μB.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Exploration of the Electronic Structure of Monoclinic α-Eu₂(MoO₄)₃: DFT-Based Study and X-ray Photoelectron Spectroscopy

et al. 2016

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“…The estimated grain sizes of the samples are 122, 129, 161, and 120 nm for increasing order of sintering temperature from 800 to 1300 C, respectively. The decrease in crystallite size at 1300 C seems to be due to the thermal decomposition of the powder sample around the melting point [29]. Fig.…”

Section: Calculationsmentioning

confidence: 97%

Crystal structure, electronic structure, and photoluminescent properties of SrMoO4:Tb3+ phosphors

Park

Moon

Jeong

et al. 2015

Materials Research Bulletin

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“…3,4 Lanthanide-doped calcium molybdate (CaMoO 4 ) is a promising candidate for photon upconversion owing to its high chemical and physical stability, low photon frequency, and high refractive index. [5][6][7] The strong polarization induced by the doping of Mo 6+ in the CaMoO 4 matrix results in low crystal-field symmetries and pronounced Stark splitting, 8 thereby providing a suitable environment for lanthanide lighting. At present, well-developed and extensively employed upconversion host materials include metal fluorides, 3 lanthanide oxides, 9 and rare earth chlorides.…”

Section: Introductionmentioning

confidence: 99%

Scalable synthesis of ytterbium and erbium codoped calcium molybdate phosphors as upconversion luminescent thermometer

Liu

Jiao

et al. 2021

AIChE Journal

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Luminescent thermometry is a noninvasive method of temperature detection with high sensitivity and response speed. The present study demonstrated the processintensified synthesis of ytterbium and erbium codoped calcium molybdate phosphors (CaMoO 4 :Yb 3+ /Er 3+ ). The experiment involved the initial premixing of the precursors using a high-gravity rotating packed bed (RPB) reactor and subsequent calcination processing. The pronounced mass transfer and micromixing of the reactants in the RPB facilitated the scalable and controllable synthesis of CaMoO 4 :Yb 3+ /Er 3+ particles with submicron sizes and regular morphologies. The CaMoO 4 :Yb 3+ /Er 3+ particles exhibited a bright-green emission with temperature-dependent luminescence characteristics under 980 nm laser irradiation. Furthermore, the maximum absolute sensitivity was determined to be 0.02837 K À1 . These results indicated that the synthesized product was a suitable candidate for application in upconversion luminescent thermometers capable of temperature sensing at the microscale.

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Structure, thermal stability and electrical conductivity of CaMoO4+δ

Cited by 16 publications

References 19 publications

Exploration of the Electronic Structure of Monoclinic α-Eu₂(MoO₄)₃: DFT-Based Study and X-ray Photoelectron Spectroscopy

Exploration of the Electronic Structure of Monoclinic α-Eu₂(MoO₄)₃: DFT-Based Study and X-ray Photoelectron Spectroscopy

Crystal structure, electronic structure, and photoluminescent properties of SrMoO4:Tb3+ phosphors

Scalable synthesis of ytterbium and erbium codoped calcium molybdate phosphors as upconversion luminescent thermometer

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Structure, thermal stability and electrical conductivity of CaMoO4+δ

Cited by 16 publications

References 19 publications

Exploration of the Electronic Structure of Monoclinic α-Eu2(MoO4)3: DFT-Based Study and X-ray Photoelectron Spectroscopy

Exploration of the Electronic Structure of Monoclinic α-Eu2(MoO4)3: DFT-Based Study and X-ray Photoelectron Spectroscopy

Crystal structure, electronic structure, and photoluminescent properties of SrMoO4:Tb3+ phosphors

Scalable synthesis of ytterbium and erbium codoped calcium molybdate phosphors as upconversion luminescent thermometer

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Exploration of the Electronic Structure of Monoclinic α-Eu₂(MoO₄)₃: DFT-Based Study and X-ray Photoelectron Spectroscopy

Exploration of the Electronic Structure of Monoclinic α-Eu₂(MoO₄)₃: DFT-Based Study and X-ray Photoelectron Spectroscopy