1 - 10 of 18 articles
This review considers advances in the fabrication of metallic, oxide, sulfide, carbon, BN, and other microgranules—the building blocks of porous materials for various applications. It is shown that attaching nanoparticles to the surface of microgranules alters some of the most important...
Polycrystalline Si0.4Ge0.6 was prepared by electron-beam float-zone melting, and its thermoelectric properties were studied in the intrinsic region. The samples were found to be p-type, with a room-temperature resistivity from 5 to 20 Ωcm. The thermoelectric figure of merit of the alloy in the...
The impurity photoconductivity spectra of undoped Cd1 − x
As2 single crystals with x ≤ 0.06 are measured in the range 85–300 K. The results are used to determine the ionization energies of donor and acceptor levels produced in the crystals by structural defects: ɛd ≈ 0.019, 0.26, and 0.42...
Homogeneous and graded n- and p-type (Bi2Te3)1 − x − y
crystals are grown by the Czochralski technique with melt supply through a floating crucible. The dimensionless thermoelectric figure of merit of the n- and p-type crystals is ZT = 1.1 (350 K) and 1.0 (375 K),...
The reported standard functions of formation of copper tellurides are critically evaluated and optimized. The thermodynamic data obtained for hitherto unexplored phases shed some light on the origin of discrepancies between the T–x phase diagrams of the Cu-Te system reported by different groups.
A procedure is developed for the preparation of Bi0.5Sb1.5Te3-4 mol % Bi2Se3 single crystals with a graded longitudinal carrier concentration profile. The thermoelectric power gradient in the crystals is 40–70 µV/K over a distance of 1–1.5 mm. The shape of the growth interface is determined....
Thermodynamic modeling (p = 9.8066 × 10−2 MPa, T = 300–2500 K) is used to assess the thermal stability of MgB12, Mg2B14, MgB6, MgB4, and MgB2. The thermodynamic properties and functions of MgB6 and Mg2B14 are calculated for the first time. The results are compared with earlier reported data.
The structure of the ternary compound Nb5Si3 − x
P0.5 + x
(x = 0–0.5) is determined by single-crystal x-ray diffraction: sp. gr. P63
mc, a = 1.32350(5) nm, c = 0.52954(1) nm; R
= 0.028, R
w = 0.081 for 547 reflections with F
). Relations between the structure of Nb5Si3 −...
The reactions of CaO and Ca(OH)2 with CO2 during mechanical activation are studied by IR spectroscopy, x-ray diffraction, and thermal analysis. The results indicate that the earlier described extensive sorption of CO2 by Ca-containing silicates during grinding is not related to the formation of...
The effect of neutron irradiation on the structure and optical properties of sapphire single crystals is studied. IR spectroscopy is used to probe the lattice dynamics in the region of principal vibrational modes in a broad range of neutron fluences. The lattice parameters of sapphire are...
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