NETZSCH Geratebau GmbH

Selb, Germany

NETZSCH Geratebau GmbH

Selb, Germany
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Romero A.H.,CINVESTAV | Cardona M.,Max Planck Institute for Solid State Research | Kremer R.K.,Max Planck Institute for Solid State Research | Lauck R.,Max Planck Institute for Solid State Research | And 4 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

The availability of ab initio electronic calculations and the concomitant techniques for deriving the corresponding lattice dynamics have been used profusely for calculating thermodynamic and vibrational properties of semiconductors, as well as for their dependence on isotopic masses. The latter have been compared with experimental data for elemental and binary semiconductors with different isotopic compositions. Here we present theoretical and experimental data for several vibronic and thermodynamic properties of CuGaS2, a canonical ternary semiconductor of the chalcopyrite family. Among these properties are the lattice parameters, the phonon dispersion relations and densities of states (projected on the Cu, Ga, and S constituents), the specific heat, and the volume thermal expansion coefficient. The calculations were performed with the abinit and vasp codes within the local density approximation for exchange and correlation, and the results are compared with data obtained on samples with the natural isotope composition for Cu, Ga, and S, as well as for isotope-enriched samples. © 2011 American Physical Society.


Cardona M.,Max Planck Institute for Solid State Research | Kremer R.K.,Max Planck Institute for Solid State Research | Lauck R.,Max Planck Institute for Solid State Research | Siegle G.,Max Planck Institute for Solid State Research | And 3 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2010

We have measured the specific heat of zinc-blende ZnS for several isotopic compositions and over a broad temperature range (3-1100 K). We have compared these results with calculations based on ab initio electronic band structures, performed using both local-density approximation and generalized gradient approximation exchange-correlation functionals. We have compared the lattice dynamics obtained in this manner with experimental data and have calculated the one-phonon and two-phonon densities of states. We have also calculated mode-Grüneisen parameters at a number of high-symmetry points of the Brillouin zone. The electronic part of our calculations has been used to investigate the effect of the 3d core electrons of zinc on the spin-orbit splitting of the top valence bands. The effect of these core electrons on the band structure of the rocksalt modification of ZnS is also discussed. © 2010 The American Physical Society.


Giordano C.,Max Planck Institute of Colloids and Interfaces | Yang W.,Max Planck Institute of Colloids and Interfaces | Lindemann A.,NETZSCH Geratebau GmbH | Crombez R.,Eastern Michigan University | And 2 more authors.
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2011

Many inorganic nanoparticles are produced as powders, but their utilization is almost always in dispersion or suspension form. We present a novel nanolatex that is very effective at producing the first reported stable waterborne dispersions of nanoparticulate WC, starting with highly aggregated WC nanopowder. Transmission electron micrographs show that the nanopowder is highly dispersed in/on the hydrogel nanolatex particles. Thermal diffusivity, dielectric loss, optical, and mechanical properties of thin films derived from waterborne dispersions are presented. Such waterborne dispersions and nanocomposite films represent new materials for photothermal, hardening, abrasive/polishing and catalysis applications. © 2010 Elsevier B.V.


Knappe S.,NETZSCH Geratebau GmbH
16th European Conference on Composite Materials, ECCM 2014 | Year: 2014

The measurement results presented clearly demonstrate the high capabilities of the selected thermoanalytical and thermophysical techniques for comprehensive thermal characterization of different carbon fiber-reinforced plastics (CFRPs). By means of Differential Scanning Calorimetry (DSC) and Dielectric Analysis (DEA), the curing behavior of thermosetting resins can be investigated. DMA (Dynamic-Mechanical Analysis) is ideal for the determination of the glass transition temperature Tg and the stiffness and damping behavior of the composite. With Laser or Light Flash Analysis (LFA), the thermal conductivity can be determined according to the fiber orientation, which rounds out a comprehensive thermal characterization program for fiber-reinforced plastics.


Rambaldi E.,Centra Ceramico | Lindemann A.,NETZSCH Geratebau GmbH
CFI Ceramic Forum International | Year: 2012

In this work thermal conductivity of traditional ceramic materials with different porosity is investigated in order to assess the contribution of the microstructure. The aim is to correlate microstructural and physical characteristics of ceramic tiles with their thermal conductivity. A porcelain stoneware mix has been selected as reference material. The contribution of the open and closed pores to thermal conductivity is investigated by using different percentages of two polymethylmethacrylate (PMMA) powders, as pore-forming agents, and by varying the firing cycle. The evaluation of the experimentally measured values evidences the influence of microstructure and porosity of the materials on the thermal conductivity and diffusivity.


Blumm J.,NETZSCH Geratebau GmbH | Lindemann A.,NETZSCH Geratebau GmbH | Meyer M.,NETZSCH Geratebau GmbH | Strasser C.,NETZSCH Geratebau GmbH
International Journal of Thermophysics | Year: 2010

Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer used in numerous industrial applications. It is often referred to by its trademark name, Teflon. Thermal characterization of a PTFE material was carried out using various thermal analysis and thermophysical properties test techniques. The transformation energetics and specific heat were measured employing differential scanning calorimetry. The thermal expansion and the density changes were determined employing pushrod dilatometry. The viscoelastic properties (storage and loss modulus) were analyzed using dynamic mechanical analysis. The thermal diffusivity was measured using the laser flash technique. Combining thermal diffusivity data with specific heat and density allows calculation of the thermal conductivity of the polymer. Measurements were carried out from-125 °C up to 150 °C. Additionally, measurements of the mechanical properties were carried out down to-170 °C. The specific heat tests were conducted into the fully molten regions up to 370 °C. © Springer Science+Business Media, LLC 2008.


Fuglein E.,NETZSCH Geratebau GmbH | Walter D.,Justus Liebig University
Journal of Thermal Analysis and Calorimetry | Year: 2012

Lanthanum oxide (La 2O 3) is of great interest as catalyst material. When La 2O 3 particles are prepared from lanthanum hydroxide (La(OH) 3) by thermal processes under air, various oxycarbonate phases are formed which are resistant to thermal hydroxylation. This phenomenon has not yet been extensively investigated, even though oxycarbonate phases at the particle surfaces cause a change in lanthanum oxide's catalytic activity. The carbonate phases formed cannot be detected by means of XRD or REM-EDX investigations due to their detection limits. Thermal analysis, particularly TG-FT-IR, allows not only for the detection of the carbonate phases in La(OH) 3, but also for the tracking of the entire dehydration process from La(OH) 3 via LaOOH to La 2O 3 as well as the correct interpretation of mass changes during the thermal transformations. Pursuant to the investigations here carried out, it was determined that carbonate-free lanthanum hydroxide compounds can only be prepared and stored in a CO 2-free protective gas atmosphere (e.g., argon). © 2012 Akadémiai Kiadó, Budapest, Hungary.


Knappe S.,NETZSCH Geratebau GmbH
ECCM 2012 - Composites at Venice, Proceedings of the 15th European Conference on Composite Materials | Year: 2012

The high performance of the modular designed Dielectric Analyzer DEA 288 Epsilon provides reliable data for in-situ cure monitoring. Practice-related application examples for RTM (Resin Transfer Molding) and SMC (Sheet Molding Compound) molding processes are demonstrated.


A method and a device for holding in readiness, transporting, processing and archiving thermoanalytical samples are disclosed. The sample containers, into which the thermoanalytical samples to be investigated are to be introduced, are provided in a magazine.


Patent
Netzsch Geratebau GmbH | Date: 2015-07-31

A device for thermal analysis including: a pair of sample container assembly sets, having a sample container and a heat sink connected using a predetermined thermal resistance; a heating unit for equally heating the pair of sample container assembly sets; a temperature control for the heating unit; a weight measurement unit measuring difference between a sample and a reference material; while the heating unit is changed.

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