Local Structures of Solid Solutions Sr1–xYxF2+x (x = 0...0.5) with Fluorite Structure Prepared by Sol–Gel and Mechanochemical Syntheses

Ritter, Benjamin; Krahl, Thoralf; Scholz, Gudrun; Kemnitz, Erhard

doi:10.1021/acs.jpcc.6b01834

Cited by 20 publications

(17 citation statements)

References 42 publications

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“…As expected, coarse grained SrF 2 only shows a single resonance at −84.8 ppm and the spectrum of YF 3 reveals the two crystallographically inequivalent F positions F(1) and F(2). The samples with µm-sized crystallites are composed of sharp lines that perfectly agree with those presented and analyzed in literature [30,31]. Broadening, but no change in isotropic chemical shift, is observed for the samples treated mechanically.…”

Section: Structure: X-ray Diffraction and 19 F High-resolution Mas Nmsupporting

confidence: 87%

“…YF 3 shows a negligible amount of an impurity phase, see the NMR signal at δ iso = −81 ppm. Upon incorporation of YF 3 , the 19 F MAS NMR lines drastically broaden because of the introduction of structural disorder, see also [31].…”

Section: Structure: X-ray Diffraction and 19 F High-resolution Mas Nmmentioning

confidence: 99%

“…The shoulder near −50 ppm might indicate Y-rich regions or clusters. For a detailed analysis of 19 F MAS spectra we refer to [31]. Indeed, 89 Y MAS NMR measurements by Ritter et al [31] suggested F clustering taking place in samples with more 10 mol% of Y 3+ .…”

Section: Structure: X-ray Diffraction and 19 F High-resolution Mas Nmmentioning

confidence: 99%

“…While log(σ 0 /(S cm −1 K)) of SrF 2 amounts to 4.1, it increases to 5.3 for Sr 0.9 Y 0.1 F 2.1 . Thus, the new defect structure, most likely involving F clustering as seen by 89 Y NMR [31] also influences besides the number of effective charge carriers also attempt frequencies of the underlying jump processes. Most likely, substitution of Sr 2+ with Y 3+ will also influence the activation entropy for ionic migration.…”

Section: Structure: X-ray Diffraction and 19 F High-resolution Mas Nmmentioning

confidence: 99%

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Fluorine Translational Anion Dynamics in Nanocrystalline Ceramics: SrF2-YF3 Solid Solutions

Breuer¹,

Stanje²,

Pregartner³

et al. 2018

Preprint

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Nanostructured materials have already become an integral part of our daily life. In many applications ion mobility decisively affects the performance of, e.g., batteries and sensors. Nanocrystalline ceramics often exhibit enhanced transport properties due to their heterogeneous structure showing crystalline (defect-rich) grains and disordered interfacial regions. In particular, anion conductivity in nonstructural binary fluorides easily exceeds that of their coarse-grained counterparts. To further increase ion dynamics aliovalent substitution is a practical method to influence the number of (i) defect sites and (ii) the charge carrier density. Here, we used high energy-ball milling to incorporate Y 3+ ions into the cubic structure of SrF 2 . As compared to pure nanocrystalline SrF 2 the ionic conductivity of Sr 1−x Y x F 2+x with x = 0.3 increased by 4 orders of magnitude reaching 0.8 × 10 −5 S cm −1 at 450 K. We discuss the effect of YF 3 incorporation on conductivities isotherms determined by both activation energies and Arrhenius pre-factors. The enhancement seen is explained by size mismatch of the cations involved, which are forced to form a cubic crystal structure with extra F anions if x is kept smaller than 0.5.

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Section: Structure: X-ray Diffraction and 19 F High-resolution Mas Nmsupporting

confidence: 87%

Section: Structure: X-ray Diffraction and 19 F High-resolution Mas Nmmentioning

confidence: 99%

Section: Structure: X-ray Diffraction and 19 F High-resolution Mas Nmmentioning

confidence: 99%

Section: Structure: X-ray Diffraction and 19 F High-resolution Mas Nmmentioning

confidence: 99%

See 2 more Smart Citations

Fluorine Translational Anion Dynamics in Nanocrystalline Ceramics: SrF2-YF3 Solid Solutions

Breuer¹,

Stanje²,

Pregartner³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…As expected, coarse grained SrF 2 only shows a single resonance at −84.8 ppm and the spectrum of YF 3 reveals the two crystallographically inequivalent F positions F(1) and F(2). The samples with µm-sized crystallites are composed of sharp lines that perfectly agree with those presented and analyzed in literature [36,40]. Broadening, but no change in isotropic chemical shift, is observed for the samples treated mechanically.…”

Section: Resultssupporting

confidence: 88%

Fluorine Translational Anion Dynamics in Nanocrystalline Ceramics: SrF2-YF3 Solid Solutions

et al. 2018

View full text Add to dashboard Cite

Nanostructured materials have already become an integral part of our daily life. In many applications, ion mobility decisively affects the performance of, e.g., batteries and sensors. Nanocrystalline ceramics often exhibit enhanced transport properties due to their heterogeneous structure showing crystalline (defect-rich) grains and disordered interfacial regions. In particular, anion conductivity in nonstructural binary fluorides easily exceeds that of their coarse-grained counterparts. To further increase ion dynamics, aliovalent substitution is a practical method to influence the number of (i) defect sites and (ii) the charge carrier density. Here, we used high energy-ball milling to incorporate Y 3+ ions into the cubic structure of SrF 2 . As compared to pure nanocrystalline SrF 2 the ionic conductivity of Sr 1−x Y x F 2+x with x = 0.3 increased by 4 orders of magnitude reaching 0.8 × 10 −5 S cm −1 at 450 K. We discuss the effect of YF 3 incorporation on conductivities isotherms determined by both activation energies and Arrhenius pre-factors. The enhancement seen is explained by size mismatch of the cations involved, which are forced to form a cubic crystal structure with extra F anions if x is kept smaller than 0.5.

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Toward Luminescent Composites by Phase Transfer of SrF₂ : Eu³⁺ Nanoparticles Capped with Hydrophobic Antenna Ligands

et al. 2020

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Transparent dispersions of hydrophobic SrF2 : Eu3+ nanoparticles in cyclohexane with up to 20% europium were obtained by fluorolytic sol‐gel synthesis followed by phase transfer into cyclohexane through capping with sodium dodecylbenzenesulfonate (SDBS). The particles were characterized by TEM, XRD and DLS as spherical objects with a diameter between 6 and 11 nm in dry state. 1H‐13CP MAS NMR experiments revealed the binding of the anionic sulfonate head group to the particle surface. The particles show bright red luminescence upon excitation of the aromatic capping agents, acting as antennas for an energy transfer from the benzenesulfonate unit to the Eu3+ centers in the particles. This synthesis method overcomes the current obstacle of the fluorolytic sol‐gel synthesis that transparent dispersions can be obtained directly only in hydrophilic solvents. To demonstrate the potential of such hydrophobized alkaline‐earth fluoride particles, transparent luminescent organic‐inorganic composites with 10% SrF2 : Eu3+ embedded into polyTEGDMA, polyBMA, polyBDDMA and polyD3MA, respectively, were prepared, endowing the polymers with the luminescence features of the nanoparticles.

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Local Structures of Solid Solutions Sr_1–xY_xF_2+x (x = 0...0.5) with Fluorite Structure Prepared by Sol–Gel and Mechanochemical Syntheses

Cited by 20 publications

References 42 publications

Fluorine Translational Anion Dynamics in Nanocrystalline Ceramics: SrF2-YF3 Solid Solutions

Fluorine Translational Anion Dynamics in Nanocrystalline Ceramics: SrF2-YF3 Solid Solutions

Fluorine Translational Anion Dynamics in Nanocrystalline Ceramics: SrF2-YF3 Solid Solutions

Toward Luminescent Composites by Phase Transfer of SrF₂ : Eu³⁺ Nanoparticles Capped with Hydrophobic Antenna Ligands

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Local Structures of Solid Solutions Sr1–xYxF2+x (x = 0...0.5) with Fluorite Structure Prepared by Sol–Gel and Mechanochemical Syntheses

Cited by 20 publications

References 42 publications

Fluorine Translational Anion Dynamics in Nanocrystalline Ceramics: SrF2-YF3 Solid Solutions

Fluorine Translational Anion Dynamics in Nanocrystalline Ceramics: SrF2-YF3 Solid Solutions

Fluorine Translational Anion Dynamics in Nanocrystalline Ceramics: SrF2-YF3 Solid Solutions

Toward Luminescent Composites by Phase Transfer of SrF2 : Eu3+ Nanoparticles Capped with Hydrophobic Antenna Ligands

Contact Info

Product

Resources

About

Local Structures of Solid Solutions Sr_1–xY_xF_2+x (x = 0...0.5) with Fluorite Structure Prepared by Sol–Gel and Mechanochemical Syntheses

Toward Luminescent Composites by Phase Transfer of SrF₂ : Eu³⁺ Nanoparticles Capped with Hydrophobic Antenna Ligands