Characterization of LaGPS:Ce scintillation crystals obtained under a reducing atmosphere

Gerasymov, Iaroslav; Hubenko, Kateryna; Viagin, Oleg; Boyarintseva, Y.; Shaposhnyk, Anna; Баумер, В. Н.; Gorbacheva, T.E.; Zelenskaya, O. V.; Galenin, E.; Kurtsev, D.; Tkachenko, Serhii; Sidletskiy, O.

doi:10.1039/d2ce01057g

Cited by 2 publications

(1 citation statement)

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“…Diluting the Ce 3+ concentration in the crystal can help lower such influences and thus make the luminescence of Ce RE (1) clear as shown in (Gd 0.75 La 0.2499 ) 2 Si 2 O 7 :0.01%Ce . In contrast, increasing the Ce 3+ concentration favors the appearance of Ce RE(2) that gradually dominates the radioluminescence and contributes to the main scintillation in most of the reported (Gd,La) 2 Si 2 O 7 :Ce 3+ crystals. ,, The Supporting Information presents a detailed discussion related to the attribution of the luminescence of Ce RE(1) and Ce RE(2) . In short, we have reinterpreted the unusual radioluminescence profiles of (Gd 1– x La x ) 2 Si 2 O 7 :Ce 3+ (0.25 ≤ x ≤ 1) scintillators based on two-site Ce 3+ luminescence in the monoclinic G-RE 2 Si 2 O 7 , and the Ce RE(2) contributes to the main scintillation.…”

Section: Resultsmentioning

confidence: 99%

On the Crystal Chemistry of RE₂Si₂O₇: Revisited Structures, Group–Subgroup Relationship, and Insights of Ce³⁺-Activated Radioluminescence

Chen

Zhou

et al. 2023

Chem. Mater.

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Polymorphic rare-earth disilicates RE 2 Si 2 O 7 (RE = La−Lu, Y, and Sc) are attractive materials as thermal barrier coatings and scintillators; however, the orthorhombic E(δ)-type (RE = Eu−Ho and Y) and the triclinic F-type (RE = Sm and Eu) remain structurally controversial hitherto. In this work, we revisit the crystal structures of E(δ)-RE 2 Si 2 O 7 (Pnma), F-RE 2 Si 2 O 7 (P1̅ ), and the monoclinic G-La 2 Si 2 O 7 (P2 1 /n) by X-ray single-crystal/ powder diffraction. The second-harmonic generation (SHG) and/ or the local-structure-sensitive VUV−UV−vis luminescence of Ce 3+ /Eu 3+ validate the structure determination. E(δ)-RE 2 Si 2 O 7 (RE = Eu−Ho) crystallizes in the centrosymmetric Pnma instead of the previous noncentrosymmetric Pna2 1 (a subgroup of Pnma).Increasing the RE 3+ radius results in structural transformations of the reconstructive-type E(δ) ↔ F and translationengleiche subgroup−group relationship F ↔ G (RE = La−Nd). More importantly, we perform a complete survey of 17 structure-types over 63 compounds of RE 2 Si 2 O 7 and their related transformations depending on the radius of RE 3+ . On the basis of these studies, one could (i) predict the potential polymorphs of RE 2 Si 2 O 7 , including the high-pressure phase and the RE 2 Si 2 O 7 solid solutions; (ii) correlate the coefficient of thermal expansion (CTE) with the crystal structure, and (iii) understand the unusual radioluminescence of (Gd,La) 2 Si 2 O 7 :Ce 3+ high-temperature scintillators.

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Section: Resultsmentioning

confidence: 99%

On the Crystal Chemistry of RE₂Si₂O₇: Revisited Structures, Group–Subgroup Relationship, and Insights of Ce³⁺-Activated Radioluminescence

Chen

Zhou

et al. 2023

Chem. Mater.

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Growth of Sesquioxide Crystals from Tungsten Crucibles by Vertical Gradient Freezing Method

et al. 2023

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Sesquioxides of lanthanides, yttrium, and scandium are promising hosts for laser and scintillation materials; however, the crystallization of such compounds is complicated by very high melting temperatures, as well as polymorph transitions. This work reports for the first time the growth of Y2O3 and Y2−xScxO3 crystals by the Vertical Gradient Freezing method from tungsten crucibles, proposing an alternative to extremely expensive rhenium and iridium crucibles. Translucent Y2O3 samples are obtained, and their luminescent and scintillation parameters are evaluated. The main issues of Y2O3 crystallization under the proposed conditions are discussed, as well as ways of enhancing the crystal quality. Finally, polymorph transitions are avoided by decreasing the average radius of the rare earth cation by Y3+/Sc3+ substitution, providing transparent Y2−xScxO3 crystals with a cubic structure.

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Characterization of LaGPS:Ce scintillation crystals obtained under a reducing atmosphere

Abstract: Ce-doped lanthanum gadolinium pyrosilicate are among the most efficient oxide scintillation crystal with a light yield of ca. 40000 ph./MeV and a high energy resolution. Meanwhile, the process of obtaining...

Cited by 2 publications

References 31 publications

On the Crystal Chemistry of RE₂Si₂O₇: Revisited Structures, Group–Subgroup Relationship, and Insights of Ce³⁺-Activated Radioluminescence

On the Crystal Chemistry of RE₂Si₂O₇: Revisited Structures, Group–Subgroup Relationship, and Insights of Ce³⁺-Activated Radioluminescence

Growth of Sesquioxide Crystals from Tungsten Crucibles by Vertical Gradient Freezing Method

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Characterization of LaGPS:Ce scintillation crystals obtained under a reducing atmosphere

Abstract: Ce-doped lanthanum gadolinium pyrosilicate are among the most efficient oxide scintillation crystal with a light yield of ca. 40000 ph./MeV and a high energy resolution. Meanwhile, the process of obtaining...

Cited by 2 publications

References 31 publications

On the Crystal Chemistry of RE2Si2O7: Revisited Structures, Group–Subgroup Relationship, and Insights of Ce3+-Activated Radioluminescence

On the Crystal Chemistry of RE2Si2O7: Revisited Structures, Group–Subgroup Relationship, and Insights of Ce3+-Activated Radioluminescence

Growth of Sesquioxide Crystals from Tungsten Crucibles by Vertical Gradient Freezing Method

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Product

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On the Crystal Chemistry of RE₂Si₂O₇: Revisited Structures, Group–Subgroup Relationship, and Insights of Ce³⁺-Activated Radioluminescence

On the Crystal Chemistry of RE₂Si₂O₇: Revisited Structures, Group–Subgroup Relationship, and Insights of Ce³⁺-Activated Radioluminescence