Temperature-induced Phase Transitions in Micro-, Submicro-, and Nanocrystalline NaNbO3
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We performed in-situ Raman spectroscopy and X-ray diffraction experiments at high temperature and ambient pressure to investigate the intrinsic anharmonic properties of beta-Mg2SiO4 and the mechanism and kinetics of its back-transformation to forsterite. H ...
Luminescence properties for C-60 single crystal, the temperature dependence of the luminescence spectra and decay kinetics were measured for a wide range of excitation energies. At low temperatures the emission spectra with well resolved structure were det ...
The piezoelectric properties of the bismuth titanate niobate Bi7Ti4NbO21 have been studied. The two phase transitions at 677 degrees and 856 degrees C are analyzed based on the measured piezoelectric properties. It is shown that the Bi7Ti4NbO21 compound is ...
The magnetic phase diagram of MnSi was studied using small angle neutron scattering. The results were analysed using the three-dimensional resolution function and the scattering cross section to model the diffraction data. A small phase pocket (phase 'A') ...
The adsorption behaviour of Si(111)2 x 1 and Si(111)7 x 7 surfaces towards Fe(CO)5 has been investigated in the temperature range 80-300 K and in the exposure range 0.1-1000 L. For both surface reconstructions, the adsorption state is found to be molecular ...
A simple, rapid, and inexpensive heating-wire technique is used for physical observations at high temperatures. The upper limit is 2000 K in air with platinum-iridium or platinum-rhodium wires and 2700 K with iridium; temperatures up to 3600 K can be achie ...
We find that even very low Ni doping levels of high-quality Bi2Sr2Ca1Cu2O8 single crystals strongly affect the transition temperature T(c). We also observed that T(c) is not related to the total Ni concentration, but only to that of Ni engaged in NiO-type ...
The room-temperature Raman spectra of aragonite and dolomite have been recorded up to 30 GPa and 25 GPa respectively and no phase changes were observed during compression, at variance with calcite. The effect of temperature on the room-pressure Raman spect ...
Modulated structures can be found in organic, inorganic and even quasicrystalline structures. They are generally detected by diffraction from the presence of satellites surrounding the Bragg reflections. Their positions may vary continuously with temperatu ...
Multilayered Co/Cu wires with a diameter of 80 nm and a length of 6 mu m were produced by electrodeposition in nanoporous polycarbonate membranes. Their magnetoresistance has been measured in a geometry where the current was perpendicular to the layer plan ...