CaMOO
 4
 in a Molybdenum Rich Borosilicate Glass‐Ceramic: A Spectroscopic Study

Mendoza, Clément; Panczer, G.; Ligny, Dominique de; Bardez-Giboire, Isabelle; Schuller, S.; Peuget, S.

doi:10.1002/9780470909874.ch6

Cited by 10 publications

(5 citation statements)

References 16 publications

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“…The doubly degenerated modes ν 2 (A g + B g ) appear around 330 cm −1 . All spectra were normalized to the intensity of the main peak at 878 cm −1 (called peak A) as it is less influenced by the beam orientation . All peaks are attributed to CaMoO 4 except one, which is only observed if Gd 3+ and Na + ions are in the powellite structure.…”

Section: Resultsmentioning

confidence: 99%

“…All spectra were normalized to the intensity of the main peak at 878 cm À1 (called peak A) as it is less influenced by the beam orientation. 26 All peaks are attributed to CaMoO 4 except one, which is only observed if Gd 3+ and Na + ions are in the powellite structure. Indeed, a peak, labeled B, grows around 907 cm À1 when Gd 2 O 3 and Na 2 O oxides are added to pure powellite.…”

Section: (1) Gd 3+ Incorporation In Polycrystalline Powellitementioning

confidence: 96%

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Powellite‐Rich Glass‐Ceramics: A Spectroscopic Study by EPR and Raman Spectroscopy

2013

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International audienceThe aim of this study is to better understand the incorporation of rare earth elements in glass-ceramics of nuclear interest. We synthesized glass-ceramics from glasses in the system SiO 2-B 2 O 3-Na 2 O-CaO-Al 2 O 3-MoO 3-Gd 2 O 3 by various heat treatments. Gadolinium is used both as a spectroscopic probe and as a minor actinide surrogate. Glass-ceramics contain only one crystalline phase in the bulk: powellite (CaMoO 4). This phase can incorporate Gd 3+ and Na + ions by substitutions on the Ca site. We demonstrated that the charge compensation by Na + favors the rare earth elements incorporation. Moreover, the incorporated elements do not seem to be randomly distributed into the powellite structure

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Section: Resultsmentioning

confidence: 99%

Section: (1) Gd 3+ Incorporation In Polycrystalline Powellitementioning

confidence: 96%

Powellite‐Rich Glass‐Ceramics: A Spectroscopic Study by EPR and Raman Spectroscopy

2013

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“…The doubly degenerated modes ν 2 ( A g + B g ) appear around 328 cm −1 . All spectra were normalized to the main peak at 883 cm −1 (called peak A) as it is less influenced by the beam orientation [49].…”

Section: Ftir and Raman Measurements: Vibrations And Lattice Phonon F...mentioning

confidence: 99%

Temperature sensing using bulk and nanoparticles of Ca_0.79Er_0.01Yb_0.2MoO₄ phosphor

Singh¹,

Kachhap²,

Singh³

et al. 2022

Methods Appl. Fluoresc.

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Optical temperature sensing is widely realized by using upconversion (UC) emission in lanthanide-doped phosphors. There are so many various parameters that are responsible for UC intensity of the phosphor like particle shape and size, type of symmetry that exist at the site position, distribution of lanthanide ions in the phosphor, and so on. However, a comparative study of the bulk and nanostructure on the temperature sensing ability of such phosphor is rare. In the present work, we have taken Ca0.79Er0.01Yb0.2MoO4 phosphors as a model system and synthesized its bulk (via solid-state reaction method, named SCEY) and nanostructures (via solution combustion route, named CCEY). We further studied their phase, crystal structure, phonon frequency, optical excitation, and emission (upconversion & downshifting) properties. Finally, the optical temperature sensing behavior of SCEY and CCEY, in the range 305 K - 573 K, have been compared. The maximum relative sensitivity of the phosphor SCEY and CCEY are 0.0061 K-1 at 305 K and 0.0094 K-1 at 299 K, respectively, while, the maximum absolute sensitivities are 0.0150 K-1 at 348 K, and 0.0170 K-1 at 398 K, respectively. We thus conclude that the temperature sensing ability of nanoparticle-based Ca0.79Er0.01Yb0.2MoO4 phosphor is better compared to its bulk phosphor.

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“…57) There is immiscibility in alkali silicate 9) and alkali borosilicate glasses. 6) The MoO 3 component in the borosilicate glasses expands the composition 1) and temperature 2) range of the immiscibility. 1,2) Hyatt et al 3) clarified by X-ray absorption spectra that the MoO 4…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Properties for Nd2(MoO4)3 Formed in the Nuclear Fuel Waste Glasses

et al. 2019

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The thermodynamic properties for Nd 2 (MoO 4) 3 were investigated. Nd 2 (MoO 4) 3 is one of the end member of the yellow phases which are known as hygroscopic harmful phases in the nuclear fuel waste glasses. The standard molar entropy, Á T 0 S m , at 298.15 K of Nd 2 (MoO 4) 3 was determined by measuring its isobaric heat capacities, C p;m , from 2 K via the fitting functions including the Debye-Einstein formula and electronic-as well as magnetic terms. The Neel temperature, T N , estimated by extrapolating the magnetic-term in the fitting function. Its standard Gibbs energy of formation, Á f G m , was determined by combining Á T 0 S m datum with the standard enthalpy of formation, Á f H m , which were estimated from ones for Ce 2 (MoO 4) 3 and Sm 2 (MoO 4) 3. The unknown standard Gibbs energy of solution, Á sol G m , at 298.15 K of Nd 2 (MoO 4) 3 was predicted from the reference data for MoO 4 2¹ (aq) and Nd 3+ (aq). The obtained thermodynamic values are as follows: Á T 0 S m (Nd 2 (MoO 4) 3 (cr), 298.15 K)/(J K ¹1 mol ¹1) = 439.29 « 4.39 Á f G m (Nd 2 (MoO 4) 3 (cr), 298.15 K)/(kJ mol ¹1) = ¹4072.13 « 6.14 Á sol G m (Nd 2 (MoO 4) 3 , 298.15 K)/(kJ (mol of MoO 4 2¹ (aq)) ¹1) = 73.12 « 2.33 T N /K = 1.55 « 0.16 The data obtained in the present work are expected to be useful for geochemical simulations of the diffusion of radioactive elements through underground water.

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CaMOO ₄ in a Molybdenum Rich Borosilicate Glass‐Ceramic: A Spectroscopic Study

Cited by 10 publications

References 16 publications

Powellite‐Rich Glass‐Ceramics: A Spectroscopic Study by EPR and Raman Spectroscopy

Powellite‐Rich Glass‐Ceramics: A Spectroscopic Study by EPR and Raman Spectroscopy

Temperature sensing using bulk and nanoparticles of Ca_0.79Er_0.01Yb_0.2MoO₄ phosphor

Thermodynamic Properties for Nd<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub> Formed in the Nuclear Fuel Waste Glasses

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CaMOO 4 in a Molybdenum Rich Borosilicate Glass‐Ceramic: A Spectroscopic Study

Cited by 10 publications

References 16 publications

Powellite‐Rich Glass‐Ceramics: A Spectroscopic Study by EPR and Raman Spectroscopy

Powellite‐Rich Glass‐Ceramics: A Spectroscopic Study by EPR and Raman Spectroscopy

Temperature sensing using bulk and nanoparticles of Ca0.79Er0.01Yb0.2MoO4 phosphor

Thermodynamic Properties for Nd<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub> Formed in the Nuclear Fuel Waste Glasses

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Product

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CaMOO ₄ in a Molybdenum Rich Borosilicate Glass‐Ceramic: A Spectroscopic Study

Temperature sensing using bulk and nanoparticles of Ca_0.79Er_0.01Yb_0.2MoO₄ phosphor