Experimental evidence of a diffusion barrier around BaF 2 nanocrystals in a silicate glass system by ASAXS

Vikram Singh Raghuwanshi; Armin Hoell; Christian Bocker; Christian Rüssel

doi:10.1039/c2ce06544d

Experimental evidence of a diffusion barrier around BaF 2 nanocrystals in a silicate glass system by ASAXS

Vikram Singh Raghuwanshi, Armin Hoell, Christian Bocker, Christian Rüssel

Research output: Contribution to journal › Article › Research › peer-review

39 Citations (Scopus)

Abstract

Nanocrystals of BaF ₂ precipitate during controlled annealing of silicate glasses composed of SiO ₂, Al ₂O ₃, K ₂O, Na ₂O, BaF ₂ and BaO. Structural characteristics such as size, shape, volume fraction and size distribution of nanoparticles in the glass matrix were studied by anomalous small angle x-ray scattering (ASAXS). Fitted ASAXS curves near the Ba absorption edge reveal the formation of a core-shell structure. Furthermore, ASAXS results allowed to determine quantitatively the composition of the nanocrystals, the surrounding region (shell) and the matrix. The evaluated composition gives evidence for an enrichment of Si atoms in a shell, that surrounds the particles and acts as a diffusion barrier. Resonant curve analysis reveals the quantitative information of the Ba atoms used in the formation of BaF ₂ nanoparticles.

Original language	English
Pages (from-to)	5215-5223
Number of pages	9
Journal	CrystEngComm
Volume	14
Issue number	16
DOIs	https://doi.org/10.1039/c2ce06544d
Publication status	Published - 21 Aug 2012
Externally published	Yes

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10.1039/c2ce06544d

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Cite this

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title = "Experimental evidence of a diffusion barrier around BaF 2 nanocrystals in a silicate glass system by ASAXS",

abstract = "Nanocrystals of BaF 2 precipitate during controlled annealing of silicate glasses composed of SiO 2, Al 2O 3, K 2O, Na 2O, BaF 2 and BaO. Structural characteristics such as size, shape, volume fraction and size distribution of nanoparticles in the glass matrix were studied by anomalous small angle x-ray scattering (ASAXS). Fitted ASAXS curves near the Ba absorption edge reveal the formation of a core-shell structure. Furthermore, ASAXS results allowed to determine quantitatively the composition of the nanocrystals, the surrounding region (shell) and the matrix. The evaluated composition gives evidence for an enrichment of Si atoms in a shell, that surrounds the particles and acts as a diffusion barrier. Resonant curve analysis reveals the quantitative information of the Ba atoms used in the formation of BaF 2 nanoparticles.",

author = "Raghuwanshi, {Vikram Singh} and Armin Hoell and Christian Bocker and Christian R{\"u}ssel",

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T1 - Experimental evidence of a diffusion barrier around BaF 2 nanocrystals in a silicate glass system by ASAXS

AU - Raghuwanshi, Vikram Singh

AU - Hoell, Armin

AU - Bocker, Christian

AU - Rüssel, Christian

PY - 2012/8/21

Y1 - 2012/8/21

N2 - Nanocrystals of BaF 2 precipitate during controlled annealing of silicate glasses composed of SiO 2, Al 2O 3, K 2O, Na 2O, BaF 2 and BaO. Structural characteristics such as size, shape, volume fraction and size distribution of nanoparticles in the glass matrix were studied by anomalous small angle x-ray scattering (ASAXS). Fitted ASAXS curves near the Ba absorption edge reveal the formation of a core-shell structure. Furthermore, ASAXS results allowed to determine quantitatively the composition of the nanocrystals, the surrounding region (shell) and the matrix. The evaluated composition gives evidence for an enrichment of Si atoms in a shell, that surrounds the particles and acts as a diffusion barrier. Resonant curve analysis reveals the quantitative information of the Ba atoms used in the formation of BaF 2 nanoparticles.

AB - Nanocrystals of BaF 2 precipitate during controlled annealing of silicate glasses composed of SiO 2, Al 2O 3, K 2O, Na 2O, BaF 2 and BaO. Structural characteristics such as size, shape, volume fraction and size distribution of nanoparticles in the glass matrix were studied by anomalous small angle x-ray scattering (ASAXS). Fitted ASAXS curves near the Ba absorption edge reveal the formation of a core-shell structure. Furthermore, ASAXS results allowed to determine quantitatively the composition of the nanocrystals, the surrounding region (shell) and the matrix. The evaluated composition gives evidence for an enrichment of Si atoms in a shell, that surrounds the particles and acts as a diffusion barrier. Resonant curve analysis reveals the quantitative information of the Ba atoms used in the formation of BaF 2 nanoparticles.

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