A5089740992- Glass properties and applications
- Material Dynamics and Properties
- Luminescence Properties of Advanced Materials
- Phase-change materials and chalcogenides
- Metal-Organic Frameworks: Synthesis and Applications
- Pigment Synthesis and Properties
- Optical Network Technologies
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Advanced NMR Techniques and Applications
- Metallic Glasses and Amorphous Alloys
- Transition Metal Oxide Nanomaterials
- Inorganic Fluorides and Related Compounds
- Lanthanide and Transition Metal Complexes
- Advanced ceramic materials synthesis
- Building materials and conservation
- Thermal and Kinetic Analysis
- Nuclear materials and radiation effects
- Advanced MRI Techniques and Applications
- Semiconductor Lasers and Optical Devices
- Recycling and utilization of industrial and municipal waste in materials production
- Ionic liquids properties and applications
- Crystal Structures and Properties
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
Schott (Germany)
2015-2025
Fraunhofer Institute for Applied Optics and Precision Engineering
2024
Institute of Materials Research of the Slovak Academy of Sciences
2023
Friedrich Schiller University Jena
2014-2022
The University of Adelaide
2018-2019
Universidade Federal de São Carlos
2012
We report on the loading-rate dependence of localized plastic deformation in inorganic covalent, metallic, ionic and superionic glasses. For this, strain-rate sensitivity is determined through instrumented nanoindentation a load-controlled jump test. Through relating to reduced temperature, packing density, network dimensionality average single bond strength system, qualitative mechanistic description strain-mediating process possible. A strong variability obtained only at intermediate...
The interface within a composite is critically important for the chemical and physical properties of these materials. However, experimental structural studies interfacial regions metal-organic framework (MOF) composites are extremely challenging. Here, we provide first example new MOF family, i.e., using an inorganic glass matrix host in place commonly used organic polymers. Crucially, also decipher atom-atom interactions at interface. In particular, dispersed zeolitic imidazolate (ZIF-8)...
Metal–organic framework (MOF) composites are proposed as solutions to the mechanical instability of pure MOF materials. Here, we present a new compositional series recently discovered MOF–crystalline inorganic glass composites. In this case, formed by combination photocatalytic titanium (MIL-125-NH2) and phosphate-based (20%Na2O–10%Na2SO4–70%P2O5). This family has been synthesized characterized using powder X-ray diffraction, thermal gravimetric analysis, differential scanning calorimetry,...
We present a topological model for binary phosphate glasses that builds on the previously introduced concepts of modifying ion sub-network and strength modifier constraints. The validity is confirmed by correct prediction Tg(x) covalent polyphosphoric acids where reduces to classical constraint counting. constraints cations are linear first neighbor non-bridging oxygens, all angular broken as expected ionic bonding. For small cations, such Li+, almost fully intact, but larger ions,...
The theory of temperature-dependent topological constraints has been used to successfully explain the compositional dependence glass properties for oxide and non-oxide compositions. However, even though predictions are qualitatively accurate, not all quantitative as precise. Here, we report on applications this theoretical framework available data binary phosphate silver metaphosphate – halide glasses. We find that some compositions overconstrained underconstrained relative predicted values....
Temperature-dependent bond constraint theory (BCT) relies on counting the number of atomic degrees freedom for a given topology glass network. It has been proven useful as simplistic approach towards prediction properties. However, it breaks down at inclusion ionic bonds and is therefore presently unable to distinguish effects varying cationic species with predominantly bonding. Here, we consider treatment modifier ions in scope BCT. Using example metaphosphate glasses broad range cation...
Phosphate glasses represent promising candidates for next-generation photonic devices due to their unique characteristics, such as vastly tunable optical properties, and high rare earth solubility. Here we show that silver metaphosphate wires with bulk properties diameters small 2 µm can be integrated into silica fibers using pressure-assisted melt filling. By analyzing two types of hybrid metaphosphate-silica fibers, the filled glass has only negligible higher attenuation a refractive index...
This article describes the synthesis of composites comprising ZIF-8 and an inorganic phosphate glass, 20Na 2 O-10NaCl-70P O 5 .
We report on the evolution of mechanical and electrical properties sodium metaphosphate glasses with addition sulfate or chloride. The these two salts converts medium-range order our from 2D phosphate chains to a mixed 1D + network similar ionic glasses, while short-range units remains unaffected. Replacing by chloride ion monotonically decreases glass transition temperature, but enhances Young's modulus moderately increases conductivity. On other hand, group temperature as well, though...
Research Article| May 01, 2022 Mechanical Properties of Oxide Glasses Bruno Poletto Rodrigues; Rodrigues Otto Schott Institute Materials Research, Friedrich Schiller University Jena, 07743 Germany Search for other works by this author on: GSW Google Scholar Theany To; To Department Chemistry and Bioscience, Aalborg University, 9220 Aalborg, Denmark Morten M. Smedskjaer; Smedskjaer Lothar Wondraczek lothar.wondraczek@uni-jena.de Reviews in Mineralogy Geochemistry (2022) 87 (1): 229–281....
Abstract We use low‐temperature heat capacity, low‐frequency Raman scattering, and THz time domain spectroscopy in order to scale the vibrational density of states Boson peak SiO 2 ‐Al O 3 ‐B Yb‐laser host glasses. When substituting B for at constant Al dopant level, we find an optimal value ratio B/Al terms mixture stability, which excess electron donor capability (relative backbone) is compensated by more acidic . At this composition, plays a mediating role structure aluminoborosilicate...
The characterisation of hybrid blends comprising a metal–organic framework (MOF) glass and phosphate is explored. mechanical thermal properties the are studied interfacial interactions between phases analysed.
Introducing an interaction parameter γ, we implement modifier and the mixed-alkali effect into bond constraint theory, apply this extension for simplistic property prediction on ternary phosphate glasses. The severity of mixed alkali results from interplay two simultaneous contributions: Bond constraints species soften or stiffen with decreasing increasing respectively. When size is not too dissimilar decrease in γ reflects that ions can easily migrate between different sites, forcing...
Metal-organic framework (MOF) composites are proposed as solutions to the mechanical instability of pure MOF materials. Here we present a new compositional series recently discovered MOF-crystalline inorganic glass composites. In this case, formed by combination photocatalytic titanium (MIL-125-NH2) and phosphate-based (20%Na2O-10%Na2SO4-70%P2O5). This family has been synthesised characterised using powder X-ray diffraction, thermal gravimetric analysis, differential scanning calorimetry,...
There are two established but fundamentally different empirical approaches to parametrize the rate of subcritical fracture in brittle materials. While both relying on a thermally activated reaction bond rupture, difference lies way as how externally applied stresses affect local energy landscape. In consideration inorganic glasses, strain is typically taken an off-set activation barrier. As alternative interpretation, system’s volumetric strain-energy added its thermal energy. Such...
We reveal the potential of step-index fibers consisting a metaphosphate glass core and silica cladding as an ultrafast octave-spanning supercontinuum source. The hybrid waveguide was fabricated by pressure-assisted melt filling possesses sophisticated dispersion behavior with two zero-dispersion points in proximity Erbium laser bands. fiber generates from 0.7 to 2.4 μm if pumped at 1.56 30 fs pulses energies low 300 pJ. Numerical simulations soliton fission double dispersive wave generation...
We focus on a recently suggested approach to the calculation of critical cooling rates for glass formation. It is "random parameterization" method that guided by limited number isothermal scanning calorimetry experiments. However, several assumptions have been made in its derivation may not mirror actual crystallization behavior most supercooled liquids, which jeopardize estimation forming ability. evaluate those and applicability tested lithium disilicate (which displays moderate internal...
Abstract We report on the fabrication, properties, and structure of cerium pyrophosphate glasses partially substituted silicophosphates. In those glasses, occurs predominantly as Ce(III). A combination dynamic nuclear magnetic resonance electrical impedance spectroscopy is used to overcome problem assessing speciation. While optical unable quantify ratio Ce(III)/Ce(IV) due spectral overlap, proxy observations effect silica‐for‐cerium substitution extinction shape width UV band gap...
The theory of temperature-dependent topological constraints has been used to successfully explain the compositional dependence glass properties for oxide and non-oxide compositions. It relates number degrees freedom with transition temperature through configurational entropy system. Based on this, we estimated directly from viscosity measurements binary alkali borate silicate glasses. Both approaches exhibit a strong decoupling, which suggest can be traced presence medium- long-range that...
The shearing of a liquid with one-dimensional molecular structure causes structural anisotropy through chain orientation. Here, we exploit this behavior to generate hybrid fiber optical waveguide tailored transversal anisotropy. Preferentially oriented chains silver metaphosphate glass are obtained by pressure-assisted melt filling silica micro-capillaries at several temperatures, pressures, internal capillary diameters, and times. Accurate control the aforementioned parameters enables...
In situ pVT analyses of poly-ionic Na-Zn sulfophosphate liquids and glasses are carried out in conjunction with ex structural characterization using Raman multi-nuclear (31P 23Na) NMR spectroscopy. These ionic exhibit highly homogeneous compaction behavior even close to their densification limit. With proceeding densification, no changes seen on short-range order, however, both the increasing substitution phosphate by sulfate high-pressure, high-temperature treatments show thermodynamic...
The interface within a composite is critically important for the chemical and physical properties of these materials. However, experimental structural studies interfacial regions metal-organic framework (MOF) composites are extremely challenging. Here, we provide first example new MOF family, i.e. using an inorganic glass matrix host in place commonly used organic polymers. Crucially, also decipher atom-atom interactions at interface. Specifically, dispersed ZIF-8 phosphate matrix,...