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Optical characterizations for ZnO doped with killer impurities (Co or Fe or Ni) having doping concentrations 0.05–1.00% by weight have been carried out at 77 K. Optical properties such as excited state lifetime, trap-depth and decay constant values have been measured using the pulse excitation...
The temperature dependence of transmission spectra near the two-phonon states zone of TlGaSe2 crystals is investigated. The additional band at 142 K and a decrease of transmission at 257 K are observed. It is shown that the successive thermocycling processes between the commensurate and...
Measurements of the electrical resistance (R-T), thermoelectric power (S-T) and thermal conductivity (κ-T) have been carried out on the superconductor Bi1.7Pb0.3-x
, (0.01 ≤ x ≤ 0.1). According to the XRD patterns the volume fraction of the Bi-2223 phase decreases in favor of...
The statistical mechanical behavior of quantum gases adsorbed on various surfaces is analyzed. The specific surfaces explored are (a) a finite and an infinite plane, (b) a circular and/or square disk, (c) a sphere, (d) a cylinder, and (e) a cone. The approximation is made that the particles are...
The lattice contribution to the thermal conductivity (κph) in La0.80Ca0.20 MnO3 manganites is discussed within the Debye-type relaxation rate approximation in terms of the acoustic phonon frequency and relaxation time. The theory is formulated when heat transfer is limited by the scattering of...
A new threefold nuclear stage has been developed and successfully tested. The nuclear stage consists of concentrically arranged cylinders of high-purity copper and platinum. This concentric structure permits a more effective utilization of the magnetic field within the upper range of the...
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