Matches in SemOpenAlex for { <https://semopenalex.org/work/W2557243384> ?p ?o ?g. }
Showing items 1 to 81 of
81
with 100 items per page.
- W2557243384 endingPage "C744" @default.
- W2557243384 startingPage "C744" @default.
- W2557243384 abstract "Glass ceramics containing fluoride crystals such as BaF2 or CaF2 with crystallite sizes in the range from 5 to 100 nm are potential candidates for numerous photonic applications. Glass ceramics containing rare-earth-doped fluoride crystals are candidates for laser materials. The size distribution plays an important role and often a narrow size distribution is required for photonic applications. In the last years a hindered growth effect leading to a more narrow size distribution was observed during the crystallization of BaF2 as well as CaF2 nanocrystals in oxy-fluoride glasses. The aim of this study is a detailed quantitative structural and nano-chemical analysis of the formation of BaF2 or CaF2 in two glass ceramics by Anomalous Small-Angle X-ray Scattering (ASAXS) to reveal and understand the mechanism of hindered growth. Nanocrystals of BaF2 precipitate during heat treatment of a silicate glass of composition 69.6SiO2-7.52Al2O3-15.04K2O-1.88Na2O-4BaF2-2BaO. X-ray diffraction measurement proved the formation of BaF2 crystals in the glass matrix. High resolution TEM showed the formation of spherical particles of sizes in range from 10-40 nm surrounded by a layer enriched with SiO2. SAXS reveal the growth of nanocrystals with increasing annealing time and temperatures. ASAXS experiments are done at four energies close to the Ba-L3 X-ray absorption edge (5247eV). The ASAXS curves for the sample annealed at 540 0 C for 20h revealed a spherical core-shell model. It turned out that the layer surrounding the BaF2 crystals is enriched with SiO2. Sizes and compositions of these layers are analyzed quantitatively. Furthermore, the ASAXS analysis reveals the presence of very small nucleates of size of about 3 nm in the as melted glass sample already [1]. A precipitation of CaF2 nanoparticles takes place during heat treatment of glasses of composition 7.65Na2O–7.69K2O–10.58CaO–12.5CaF2–5.77Al2O3–55.8SiO2 up to 40 hours. SAXS experiments and especially ASAXS near the Ca-K edge proves the formation of CaF2 nanoparticle surrounded with SiO2 enriched layers, quantitatively. The ASAXS effect is very pronounced at this untypical low energy for ASAXS studies at the Ca-K edge. The ASAXS result reveals crystal sizes between 10-20 nm surrounded by a shell of lower electron density. Additional very small heterogeneities are found after long annealing with diameters of about 1.6 nm [2]." @default.
- W2557243384 created "2016-12-08" @default.
- W2557243384 creator A5002477316 @default.
- W2557243384 creator A5003981966 @default.
- W2557243384 creator A5058969946 @default.
- W2557243384 date "2014-08-05" @default.
- W2557243384 modified "2023-10-09" @default.
- W2557243384 title "Structure investigations of nanocrystalline glass ceramics by ASAXS" @default.
- W2557243384 doi "https://doi.org/10.1107/s2053273314092559" @default.
- W2557243384 hasPublicationYear "2014" @default.
- W2557243384 type Work @default.
- W2557243384 sameAs 2557243384 @default.
- W2557243384 citedByCount "0" @default.
- W2557243384 crossrefType "journal-article" @default.
- W2557243384 hasAuthorship W2557243384A5002477316 @default.
- W2557243384 hasAuthorship W2557243384A5003981966 @default.
- W2557243384 hasAuthorship W2557243384A5058969946 @default.
- W2557243384 hasBestOaLocation W25572433841 @default.
- W2557243384 hasConcept C113196181 @default.
- W2557243384 hasConcept C120665830 @default.
- W2557243384 hasConcept C121332964 @default.
- W2557243384 hasConcept C127413603 @default.
- W2557243384 hasConcept C131888329 @default.
- W2557243384 hasConcept C134132462 @default.
- W2557243384 hasConcept C137637335 @default.
- W2557243384 hasConcept C140676511 @default.
- W2557243384 hasConcept C159985019 @default.
- W2557243384 hasConcept C171250308 @default.
- W2557243384 hasConcept C175854130 @default.
- W2557243384 hasConcept C185592680 @default.
- W2557243384 hasConcept C191486275 @default.
- W2557243384 hasConcept C191897082 @default.
- W2557243384 hasConcept C192562407 @default.
- W2557243384 hasConcept C199289684 @default.
- W2557243384 hasConcept C203036418 @default.
- W2557243384 hasConcept C42360764 @default.
- W2557243384 hasConcept C43617362 @default.
- W2557243384 hasConcept C49040817 @default.
- W2557243384 hasConcept C57863236 @default.
- W2557243384 hasConceptScore W2557243384C113196181 @default.
- W2557243384 hasConceptScore W2557243384C120665830 @default.
- W2557243384 hasConceptScore W2557243384C121332964 @default.
- W2557243384 hasConceptScore W2557243384C127413603 @default.
- W2557243384 hasConceptScore W2557243384C131888329 @default.
- W2557243384 hasConceptScore W2557243384C134132462 @default.
- W2557243384 hasConceptScore W2557243384C137637335 @default.
- W2557243384 hasConceptScore W2557243384C140676511 @default.
- W2557243384 hasConceptScore W2557243384C159985019 @default.
- W2557243384 hasConceptScore W2557243384C171250308 @default.
- W2557243384 hasConceptScore W2557243384C175854130 @default.
- W2557243384 hasConceptScore W2557243384C185592680 @default.
- W2557243384 hasConceptScore W2557243384C191486275 @default.
- W2557243384 hasConceptScore W2557243384C191897082 @default.
- W2557243384 hasConceptScore W2557243384C192562407 @default.
- W2557243384 hasConceptScore W2557243384C199289684 @default.
- W2557243384 hasConceptScore W2557243384C203036418 @default.
- W2557243384 hasConceptScore W2557243384C42360764 @default.
- W2557243384 hasConceptScore W2557243384C43617362 @default.
- W2557243384 hasConceptScore W2557243384C49040817 @default.
- W2557243384 hasConceptScore W2557243384C57863236 @default.
- W2557243384 hasIssue "a1" @default.
- W2557243384 hasLocation W25572433841 @default.
- W2557243384 hasOpenAccess W2557243384 @default.
- W2557243384 hasPrimaryLocation W25572433841 @default.
- W2557243384 hasRelatedWork W1970167003 @default.
- W2557243384 hasRelatedWork W1976571779 @default.
- W2557243384 hasRelatedWork W1983193014 @default.
- W2557243384 hasRelatedWork W2005332983 @default.
- W2557243384 hasRelatedWork W2040161208 @default.
- W2557243384 hasRelatedWork W2054556061 @default.
- W2557243384 hasRelatedWork W2127271064 @default.
- W2557243384 hasRelatedWork W2140202692 @default.
- W2557243384 hasRelatedWork W2349047643 @default.
- W2557243384 hasRelatedWork W822118396 @default.
- W2557243384 hasVolume "70" @default.
- W2557243384 isParatext "false" @default.
- W2557243384 isRetracted "false" @default.
- W2557243384 magId "2557243384" @default.
- W2557243384 workType "article" @default.