in this experimental work the pressure induced phase transformation of silicon and germaniumhas been studied. it was shown that at a particular value of applied pressure, (pt), depending on the sampletemperature, the electrical resistance of the specimen falls off to a metallic state. the main goal of this studywas to find out how the phase transformation pressure, pt, for a p-type silicon vari...

The method of X-Ray Photo-electron Spectroscopy is used to determine the chemical state of the sulfur species present in fly-ash samples produced by burning a number of pulverized coal samples under reducing conditions in a continuous combustion furnace. The influence of submicron metallic constituents present in the flue-gases of the pyrometallurical systems on the state of the sulfur species ...

Milind N. Kunchur,1,* B. I. Ivlev,2 D. K. Christen,3 and J. M. Phillips4 1Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208 2Instituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico 3Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 4Sandia National Laboratory, M S 1411, Albuquerque, New M...

Excitonic and free-carrier transitions in single-wall carbon nanotubes are distinguished using field-enhanced photocurrent spectroscopy. Electric field dissociation allows for the detection of bound-exciton states that otherwise would not contribute to the photocurrent. Excitonic states associated with both the ground-state semiconductor and the ground-state metallic nanotube transitions are re...

The behavior of the metallic state of lightly electron-doped SrTiO3 has been studied using angle-integrated ultraviolet photoemission spectroscopy (UPS) and angle-resolved photoemission spectroscopy (ARPES). Two states in the bulk band gap of stoichiometric SrTiO3 are shown by doping electron carriers: a metallic state with a sharp Fermi cutoff and a broad state centered at 1.3 eV below the Fer...