Results 81 to 90 of about 480,384 (278)

Spin-driven Phase Transitions in ZnCr$_2$Se$_4$ and ZnCr$_2$S$_4$ Probed by High Resolution Synchrotron X-ray and Neutron Powder Diffraction

, 2008
The crystal and magnetic structures of the spinel compounds ZnCr$_2$S$_4$ and ZnCr$_2$Se$_4$ were investigated by high resolution powder synchrotron and neutron diffraction.
A. Buchsteiner, A. Krimmel, A. Loidl, A. N. Fitch, D. M. Tobbens, D. N. Argyriou, F. Yokaichiya, H. N. Bordallo, I. Margiolaki, N. Stüßer, P. Thompson, R. Kleinberger, R. Plumier, V. Tsurkan, W. Baltensperger   +14 more
core   +1 more source

Negative thermal expansion and local dynamics [PDF]

Journal of Physics: Conference Series, 2009
A systematic EXAFS study has been performed on crystals affected by negative thermal expansion (NTE) and characterized by different structures: diamond-zincblende, cuprite, delafossite. Some general common features emerge from the results. The nearest-neighbours bond thermal expansion measured by EXAFS is always positive; within each family of ...
P. FORNASINI, N. A. EL ALL, S. I. AHMES, SANSON, ANDREA, M. VACCARI   +4 more
openaire   +3 more sources

Synthesis of a Novel Thermoresponsive S53P4 Bioactive Glass Extract–Poloxamer 407 Injectable Hydrogels: Assessment of Biocompatibility and Antimicrobial Properties

Advanced Engineering Materials, EarlyView.
This study investigates innovative thermoreversible hydrogels derived from S53P4 bioactive glass extracts to aid in the healing of infected diabetic foot wounds. These injectable gels, which gel at body temperature, release beneficial ions and remain stable over time.
Marian G. Vargas Guerrero, Adrian Stiller, Alex Nygård, Matej Krivulka, Lars Galema, Erwin Peters, Jimmy Lucchesi, Peter Uppstu, Leena Hupa, Jacobus J. C. Arts   +9 more
wiley   +1 more source

Negative thermal expansion induced by coordination number change in high-entropy oxides [PDF]

AIP Advances
Coordination number changes in chemical bonds sometimes produce a gigantic volume change, as exemplified by the α–β transition in tin. We have achieved a giant negative thermal expansion (NTE) using four-to-six coordination number change in high-entropy ...
N. Iida, R. Kasugai, K. Ikeda, K. Saitoh, D. Ito, N. Katayama, Y. Okamoto, D. Hirai, K. Takenaka   +8 more
doaj   +1 more source

Anomalous thermal expansion of Sb$_2$Te$_3$ topological insulator

, 2012
We have investigated the temperature dependence of the linear thermal expansion along the hexagonal c axis ($\Delta L$), in-plane resistivity ($\rho$), and specific heat ($C_p$) of the topological insulator Sb$_2$Te$_3$ single crystal.
Bhoi, D., Dutta, P., Ganesan, V., Khan, N., Mandal, P., Midya, A., Samatham, S. Shanmukharao   +6 more
core   +1 more source

A Thermodynamic 3D Model for the Simulation of Diffusion‐Controlled Alloying Processes in Heterogeneous Material Structures

Advanced Engineering Materials, EarlyView.
A numerical model resulting from irreversible thermodynamics for describing transport processes is introduced, focusing on thermodynamic activity gradients as the actual driving force for diffusion. Implemented in CUDA C++ and using CalPhaD methods for determining the necessary activity data, the model accurately simulates interdiffusion in aluminum ...
Ulrich Holländer, Leonhard Holländer, André Langohr, Hans Jürgen Maier   +3 more
wiley   +1 more source

Pressure‐Induced Volumetric Negative Thermal Expansion in CoZr2 Superconductor

Advanced Electronic Materials
The study investigates the thermal expansion and superconducting properties of a CuAl2‐type (tetragonal) superconductor CoZr2 under high pressures. High‐pressure synchrotron X‐ray diffraction is performed in a pressure range of 2.9 GPa < P < 10.4 GPa ...
Yuto Watanabe, Hiroto Arima, Saori Kawaguchi‐Imada, Hirokazu Kadobayashi, Kenta Oka, Hidetomo Usui, Ryo Matsumoto, Yoshihiko Takano, Takeshi Kawahata, Chizuru Kawashima, Hiroki Takahashi, Aichi Yamashita, Yoshikazu Mizuguchi   +12 more
doaj   +1 more source

Investigation of Laser Ablation and Brush Pre‐Treatments for AlCu Cold Roll Bonding in Oxygen‐Free Conditions

Advanced Engineering Materials, EarlyView.
It is shown that laser ablation pretreatment under oxygen‐free conditions enables copper–aluminium bonding at significantly lower deformation degrees and improved properties compared to mechanical brushing. Laser ablation further increases interface contact area and induces favourable residual stress states and microstructural compatibility ...
Khemais Barienti, Finn‐Lennard Janthur, Selina Raumel, Sascha Jan Zimmermann, Sarah Seffer, René Gustus, Sebastian Herbst, Marc C. Wurz, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Florian Nürnberger   +11 more
wiley   +1 more source

Thermal expansion of the magnetically ordering intermetallics RTMg (R = Eu, Gd and T = Ag, Au)

, 2007
We report measurements of the thermal expansion for two Eu$^{+2}$- and two Gd$^{+3}$-based intermetallics which exhibit ferro- or antiferromagnetic phase transitions. These materials show sharp positive (EuAgMg and GdAuMg) and negative (EuAuMg and GdAgMg)
Gibson B J, H Hartmann, Hartmann H, J A Mydosh, J Rohrkamp, O Heyer, Pierre J, R Pöttgen, Rohrkamp J, S Jodlauk, T Fickenscher, T Lorenz   +11 more
core   +1 more source

Negative thermal expansion of pure and doped graphene

RSC Advances, 2017
Graphene and its derivatives distinguish themselves for their large negative thermal expansion even at temperatures as high as 1000 K.
Sarita Mann, Ranjan Kumar, V. K. Jindal
openaire   +3 more sources