Short-range order in metals above the Curie temperature

Piezoelectricity above the Curie temperature? Combining flexoelectricity and functional grading to enable high-temperature electromechanical coupling

functional grading to enable high-temperature electromechanical coupling R. Mbarki, N. Baccam, Kaushik Dayal, and P. Sharma Department of Mechanical Engineering, University of Houston, Houston, Texas 77204, USA Department of Mathematics, Southwestern University, Georgetown, Texas 78626, USA Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 1...

Magnetic polaron conduction above the Curie temperature in Fe-doped Pr0.75Sr0.25MnO3

The transport behaviour of Fe-doped Pr0.75Sr0.25MnO3 (PSMFO, Fe = 0.05) is studied by zero-field conductivity probing and Raman spectroscopy. It is revealed that the conductivity of PSMFO above Tm, the metal–insulator transition point, shows variable-range-hopping behaviour instead of the smallpolaron mode. The B2g Raman line at 630 cm−1 arising from the Mn–O bending and stretching modes underg...

Short-range order in ternary aUoy semiconductors

Atom arrangements in IH-V ternary aHoy semiconductors are discussed using a thermodynamic analysis in which the elastic strain caused by mixing is considered as the mixing enthalpy. In calculating the strain energy, both bond-stretching and bond-angl.e distortion are taken into account, and Martin's microscopic elastic constants are used. The results show that there is a preference for ordering...

Curie temperature of multiphase nanostructures

Short-range order of compressed amorphous GeSe2

The structure of amorphous GeSe2 (a-GeSe2) has been studied by means of a combination of two-edges X-ray absorption spectroscopy (XAS) and angle-dispersive X-ray diffraction under pressures up to about 30 GPa. Multiple-edge XAS data-analysis of a-GeSe2 at ambient conditions allowed us to reconstruct and compare the first-neighbor distribution function with previous results obtained by neutron d...