A5018138885- Concrete and Cement Materials Research
- X-ray Diffraction in Crystallography
- Clay minerals and soil interactions
- Magnesium Oxide Properties and Applications
- Soil and Unsaturated Flow
- Building materials and conservation
- Luminescence Properties of Advanced Materials
- Calcium Carbonate Crystallization and Inhibition
- Advanced ceramic materials synthesis
- Crystallization and Solubility Studies
- Innovative concrete reinforcement materials
- Crystallography and molecular interactions
- Cultural Heritage Materials Analysis
- Mineralogy and Gemology Studies
- Quantum Dots Synthesis And Properties
- Muon and positron interactions and applications
- Nuclear materials and radiation effects
- Chemical Synthesis and Characterization
- Drilling and Well Engineering
- Advanced NMR Techniques and Applications
- CO2 Sequestration and Geologic Interactions
- Concrete Properties and Behavior
- Seismic Imaging and Inversion Techniques
- Glass properties and applications
- Nanocluster Synthesis and Applications
Bruker (Germany)
2024
Friedrich-Alexander-Universität Erlangen-Nürnberg
2013-2023
This article reports the derivation of a physically based geometric description mean diameter orthogonal shapes and provides an efficient formalism to relate these reciprocal lattices corresponding apparent crystallite sizes. The following descriptions provide reasonable approximation for simulation refinement anisotropic domain morphology in powder diffraction techniques.
Recently, a hydrous carbonate-containing brucite (HCB) with an approximate composition of MgCO3·35 Mg(OH)2·H2O was postulated as hydration product binders based on mixtures reactive magnesia and hydromagnesite (Mg5(CO3)4(OH)2·4H2O). X-ray diffraction showed that the 001 reflection this phase split into two reflections at 20 °C, whereas 60 °C only one occurred. Rietveld refinement revealed pattern HCB-phase could be fitted well when random displacement (stacking faults) movement layers in x,...
In this study, the application of (an)isotropic size determination using a recently proposed model for double-Voigt approach is demonstrated and validated against line profile simulations Whole Powder Pattern Modelling approach. The fitting simulated profiles demonstrates that attained crystallite sizes morphologies are in very reasonable agreement with values thus demonstrate even routine scenarios credible morphology information can be obtained approximation. aim contribution to provide...
An efficient geometric approach to refine anisotropic domain morphology in the double-Voigt based on variance-slope apparent crystallite size was recently described. In this way, Lorentzian part of Voigt contribution can be directly linked an effective area- or surface-weighted morphology. The is, however, rarely pure Lorentzian. article, previously considered models are extended for Gaussian broadening, also taking into account distributions. limits validity discussed.
This article represents the first foray into investigating consequences of various material combinations on short-wave infrared (SWIR, 1000-2000 nm) performance Tm-based core-shell nanocrystals (NCs) above 1600 nm. In total, six different involving two types SWIR-emitting core NCs (α-NaTmF
Typical feature of high-fired medieval gypsum mortars is a compact microstructure squat crystals containing firing products as remains the calcination process. So far, burning history binder estimated based on morphological characteristics latter. A novel Raman microspectroscopy approach provides access to temperatures individual anhydrite grains quantifiable spectroscopic changes appearing due gradual variations crystallinity, independently confirmed by X-ray diffraction analysis anhydrites...
In this study, we resolved discrepancies concerning the experimentally determined structure of benzamide molecular crystals from dispersion-corrected density functional calculations. A clear energy ranking was obtained for two candidates stable (P1) modification benzamide. This rationalised by subtle differences interactions in crystal. The potential different structures dominated interplay intermolecular attraction and torsion/deformation to accommodate favourable hydrogen-bonded networks....
The interactions between latex and cement are still not completely understood. In this work, we would like to address the temporal changes in hardening film formation. For reason, hydration process formation were simultaneously monitored. This scientific issue is even more challenging as a nondestructive quantitative analysis of available yet. Here, report on simultaneous monitoring phase development cementitious systems via 1H-time-domain-NMR for first time. obtained results validated using...
The C-S-H-phase is the most important strength generating phase in concrete and other cementitious materials. analysis of C-S-H therefore an instrument innovations field its durability sustainability. quantification insights are hindered by predominantly amorphous structure C-S-H. Only time consuming expensive solid state nuclear magnetic resonance spectroscopy (NMR) gives a chance to get results, but restricted model substances. A new technique, based on cheap widespread...
Recently, a hydrous carbonate-containing brucite (HCB) with an approximate composition of MgCO3·35Mg(OH)2·H2O was postulated as hydration product binders based on mixtures reactive magnesia and hydromagnesite (Mg5(CO3)4(OH)2∙4H2O). X-ray diffraction showed that the 001 reflection this phase split into two reflections at 20°C, whereas 60°C only one occurred. Rietveld refinement revealed pattern HCB-phase could be fitted well when random displacement (stacking faults) movement layers in x, y z...
Abstract The production process of autoclaved aerated concrete (AAC) is driven by the transformation mineral phases. During green cake step, strength developed formation hydrate phases such as ettringite and in larger quantity portlandite. In respective XRD plots, portlandite often shows anisotropic peak broadening due to domain morphology. A new implementation Rietveld refinement allows refine calculating sizes. An appropriate model used approximate domains this way, it possible track...