The effect of ZrO2 on the crystallization of a glass in the system BaO/SrO/ZnO/SiO2: surface versus bulk crystallization

Vladislavova, Liliya; Thieme, Christian

doi:10.1007/s10853-016-0667-0

Cited by 23 publications

(7 citation statements)

References 24 publications

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“…From microstructure point of view (Figures 2 and 3), the pyrochlore crystals are dispersed almost homogeneously in the bulk of the GCs, which is an important requirement for GC waste forms envisaged for minor actinide immobilization. This particular microstructure results from the bulk crystallization process in the presence of nucleating agents, which would easily initiate nucleation in the bulk material 60‐62 . In general, the crystallization of glasses can be classified into bulk and surface crystallizations 61 .…”

Section: Resultsmentioning

confidence: 99%

“…This particular microstructure results from the bulk crystallization process in the presence of nucleating agents, which would easily initiate nucleation in the bulk material. [60][61][62] In general, the crystallization of glasses can be classified into bulk and surface crystallizations. 61 In the case of bulk crystallization, the formation of crystallites initiates from nucleating sites homogenously distributed inside bulky glass samples.…”

Section: Further Discussionmentioning

confidence: 99%

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Pyrochlore glass‐ceramics fabricated via both sintering and hot isostatic pressing for minor actinide immobilization

Zhang

Wei

et al. 2020

J Am Ceram Soc

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Pyrochlore glass‐ceramics (GCs) have been investigated with samples fabricated via both sintering and hot isostatic pressing (HIPing) of a mixed oxide precursor. It has been demonstrated that sintering at 1200°C in air is necessary to obtain well‐crystallized pyrochlore crystals in a sodium aluminoborosilicate glass through a one‐step controlled cooling. The crystallization, structure, and microstructure of Eu2Ti2O7 pyrochlore as the major phases in residual glass were confirmed with X‐ray diffraction (XRD), scanning electron microscopy‐energy dispersive spectroscopy, transmission electron microscopy, and Raman spectroscopy. The structures of major Eu2Ti2O7 pyrochlore and minor [Eu4.67O(SiO4)3] apatite in both sintered and HIPed samples were refined using synchrotron XRD data. While the processing atmosphere did not appear to affect the cell parameter of the main pyrochlore phase, very small volume expansion (~0.3%) was observed for the minor apatite phase in the HIPed sample. In addition, static leaching of the HIPed sample confirmed that pyrochlore GCs are chemically durable. Overall, pyrochlore GCs prepared via both sintering and HIPing with the Eu partitioning factor of ~23 between ceramics and the residual glass are suitable waste forms for minor actinides with processing chemicals.

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Section: Resultsmentioning

confidence: 99%

Section: Further Discussionmentioning

confidence: 99%

Pyrochlore glass‐ceramics fabricated via both sintering and hot isostatic pressing for minor actinide immobilization

Zhang

Wei

et al. 2020

J Am Ceram Soc

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“…As oxidic nucleation agents, comparatively high ZrO 2 concentrations of ≥6 mol% can be used. 62,63 Additionally, P 2 O 5 64 , both P 2 O 5 and Ce 2 O 3 65 , WO 3 66 and Ta 2 O 5 67 were reported to act as nucleation agents. It should be noted that the oxidic nucleation agents up to now reported in the literature for these glass systems are by far not as effective as the noble metals.…”

Section: Oxidic Nucleation Agentsmentioning

confidence: 99%

Solid solutions based on BaZn₂Si₂O₇ with thermal expansions from negative to highly positive – a review

Thieme

Rüssel²

2022

CrystEngComm

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“…In order to achieve volume crystallization with homogeneously dispersed crystals in the sub-micrometer range, nucleation agents have to be evaluated. The commonly known ones, such as TiO 2 ZrO 2 or metallic gold, do not work satisfactorily within this glass system. − Therefore, this work focuses on the effect of SnO 2 on the crystallization behavior with an emphasis on the microstructure as well as thermal expansion behavior.…”

Section: Introductionmentioning

confidence: 99%

Role of Tin Oxide as a Nucleating Agent with Low Solubility in BaO–SrO–ZnO–SiO₂ Glasses Studied by Electron and X-ray Microscopy

Thieme

Kracker

et al. 2019

Crystal Growth & Design

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The crystallization behavior of BaO–SrO–ZnO–SiO2 glasses containing different concentrations of SnO2 was studied using microscopic techniques as well as thermal analyses. It is shown that SnO2 triggers volume crystallization, but at low nucleation rates. During heat treatments near respective glass transition temperatures, nucleation takes place. In the course of this nucleation treatment, SnO2 added leads to the formation of small metallic particles which serve as nuclei for the growth of Ba1–x Sr x Zn2Si2O7 crystals. The metallic nuclei are composed of metallic Sn and Pt. The latter is introduced into the glass during synthesis in a Pt crucible as a contaminant. Besides scanning electron microscopy, also X-ray microscopy was used to study the microstructure as well as the origin of appearing cracks in three dimensions. It was found that the different morphologies detected via scanning electron microscopy are solely due to different orientations of the crystals within the glassy matrix. Furthermore, evidence is given that in some cases microcrack formation starts right at the center of the crystals, where metallic particles are found.

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The effect of ZrO2 on the crystallization of a glass in the system BaO/SrO/ZnO/SiO2: surface versus bulk crystallization

Cited by 23 publications

References 24 publications

Pyrochlore glass‐ceramics fabricated via both sintering and hot isostatic pressing for minor actinide immobilization

Pyrochlore glass‐ceramics fabricated via both sintering and hot isostatic pressing for minor actinide immobilization

Solid solutions based on BaZn₂Si₂O₇ with thermal expansions from negative to highly positive – a review

Role of Tin Oxide as a Nucleating Agent with Low Solubility in BaO–SrO–ZnO–SiO₂ Glasses Studied by Electron and X-ray Microscopy

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The effect of ZrO2 on the crystallization of a glass in the system BaO/SrO/ZnO/SiO2: surface versus bulk crystallization

Cited by 23 publications

References 24 publications

Pyrochlore glass‐ceramics fabricated via both sintering and hot isostatic pressing for minor actinide immobilization

Pyrochlore glass‐ceramics fabricated via both sintering and hot isostatic pressing for minor actinide immobilization

Solid solutions based on BaZn2Si2O7 with thermal expansions from negative to highly positive – a review

Role of Tin Oxide as a Nucleating Agent with Low Solubility in BaO–SrO–ZnO–SiO2 Glasses Studied by Electron and X-ray Microscopy

Contact Info

Product

Resources

About

Solid solutions based on BaZn₂Si₂O₇ with thermal expansions from negative to highly positive – a review

Role of Tin Oxide as a Nucleating Agent with Low Solubility in BaO–SrO–ZnO–SiO₂ Glasses Studied by Electron and X-ray Microscopy