Sintering of Ca&lt;sub&gt;2&lt;/sub&gt;MgWO&lt;sub&gt;6&lt;/sub&gt; Ceramic and its Stability Test in Crude Petroleum

Oliveira, José Carlos da Silva; Ferreira, Ricardo Artur Sanguinetti; Yadava, Yogendra Prasad

doi:10.4028/www.scientific.net/msf.820.149

Cited by 2 publications

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“… 11 More importantly, a phase transition in Ba (2 – x ) Sr x MgWO 6 :Er,Yb resulted in an improvement in the maximum relative sensitivity of the thermometer, increasing from 0.8%/K to 0.9%/K, respectively. 11 While Ca 2 MgWO 6 (CMW) has been studied over the past few years, the main focus has been on ceramic fabrication 20 , 21 and optical thermometry based on the up-conversion luminescence of Er 3+ and Yb 3+22 . Surprisingly, the luminescent properties of rare-earth-ion-activated −Sr 2 MgWO 6 (SMW) remain unknown.…”

Section: Introductionmentioning

confidence: 99%

Effect of A-Cation Radius on the Structure, Luminescence, and Temperature Sensing of Double Perovskites A₂MgWO₆ Doped with Dy³⁺ (A = Ca, Sr, Ba)

Vu,

Stefańska,

Dereń

2023

Inorg. Chem.

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Herein, we report a case of A 2 MgWO 6 (A = Ca, Sr, Ba) doped with 2%Dy 3+ , 2%Li + , in which the influences of the cation substitution are exhibited through the crystal structure, the charge transfer band (O 2– –W 6+ ), the emission spectrum, the color of the luminescence, and the luminescent decay time. The substitution of Ca 2+ and Sr 2+ ions for larger ions (Ba 2+ ) led to the crystal structure alteration from cubic to monoclinic and tetragonal, respectively. These structure changes also lowered the crystallography symmetry site of Dy 3+ , tuned the color of the emitted light from the whitish to yellowish region, and caused a blue shift of the CTB. Furthermore, a significant decline in the lifetime of the 4 F 9/2 → 6 H 13/2,15/2 transitions was noticed, from 748, 199, to 146 μs corresponding to Ba, Sr, Ca sample owing to the reduction in the local symmetry of Dy 3+ . Moreover, the thermal sensing properties of 2%Dy 3+ -doped samples were investigated based on the fluorescence intensity ratio technique in the range of 80–325 K. Under 266 nm excitation wavelength, the maximum relative sensitivity of the investigated samples was remarkably enhanced from 2.26%/K, 3.04%/K, to 4.38%/K corresponding to Ba, Ca, and Sr samples, respectively. In addition to providing a comprehensive understanding of the effects of compositional modifications on the optical properties, the results also present a viable pathway to manipulate the temperature sensing performance.

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Section: Introductionmentioning

confidence: 99%

Effect of A-Cation Radius on the Structure, Luminescence, and Temperature Sensing of Double Perovskites A₂MgWO₆ Doped with Dy³⁺ (A = Ca, Sr, Ba)

Vu,

Stefańska,

Dereń

2023

Inorg. Chem.

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Production of Ba2AlNbO6 Ceramics and Study of their Stability in Crude Petroleum for the Conservation of Metallic Sensing Elements Used in Petroleum Extraction

et al. 2018

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In the present work niobium based complex cubic perovskite oxide Ba 2 AlNbO 6 ceramics were produced, characterized and their stability in crude petroleum environment was studied for inert ceramic embedding used in petroleum extraction. Ba 2 AlNbO 6 ceramic powder was prepared by means of thermo-mechanical processing. Structural characteristics of calcined material were investigated by powder X -ray diffractometry, which presented a single phase complex cubic perovskite structure with lattice parameter a = 8.3418 Å. Compacted Ba 2 AlNbO 6 ceramics were sintered at 1150ºC during 72 hours in ambient atmosphere. The microstructure of the sintered ceramics was studied by scanning electron microscopy and mechanical behavior was studied by Vicker's micro-hardness testing. The sintered ceramics were submerged in crude petroleum for 60 days. The ceramics were taken out from petroleum periodically and subjected to structural, microstructural and mechanical characterizations. The results showed that the ceramics submerged in crude petroleum did not suffer any change at any stage of submersion. These characteristics make this material suitable for inert ceramic embedding for sensors used in petroleum extraction.

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Sintering of Ca<sub>2</sub>MgWO<sub>6</sub> Ceramic and its Stability Test in Crude Petroleum

Cited by 2 publications

References 6 publications

Effect of A-Cation Radius on the Structure, Luminescence, and Temperature Sensing of Double Perovskites A₂MgWO₆ Doped with Dy³⁺ (A = Ca, Sr, Ba)

Effect of A-Cation Radius on the Structure, Luminescence, and Temperature Sensing of Double Perovskites A₂MgWO₆ Doped with Dy³⁺ (A = Ca, Sr, Ba)

Production of Ba2AlNbO6 Ceramics and Study of their Stability in Crude Petroleum for the Conservation of Metallic Sensing Elements Used in Petroleum Extraction

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Sintering of Ca<sub>2</sub>MgWO<sub>6</sub> Ceramic and its Stability Test in Crude Petroleum

Cited by 2 publications

References 6 publications

Effect of A-Cation Radius on the Structure, Luminescence, and Temperature Sensing of Double Perovskites A2MgWO6 Doped with Dy3+ (A = Ca, Sr, Ba)

Effect of A-Cation Radius on the Structure, Luminescence, and Temperature Sensing of Double Perovskites A2MgWO6 Doped with Dy3+ (A = Ca, Sr, Ba)

Production of Ba2AlNbO6 Ceramics and Study of their Stability in Crude Petroleum for the Conservation of Metallic Sensing Elements Used in Petroleum Extraction

Contact Info

Product

Resources

About

Effect of A-Cation Radius on the Structure, Luminescence, and Temperature Sensing of Double Perovskites A₂MgWO₆ Doped with Dy³⁺ (A = Ca, Sr, Ba)

Effect of A-Cation Radius on the Structure, Luminescence, and Temperature Sensing of Double Perovskites A₂MgWO₆ Doped with Dy³⁺ (A = Ca, Sr, Ba)