Growth and properties of LnIn3S6 crystals

LnIn₃S₆ (Ln = La, Nd, Yb) crystals were grown by chemical vapor transport. All the LnIn₃S₆ compounds were shown to be isostructural and to crystallize in orthorhombic symmetry (sp. gr.Pbam, Z = 4;a = 4.06-3.80 Å,b = 11.84-11.62 Å, c = 21.35-20.94 Å). The LnIn₃S₆ compounds aren-type semiconductors, with a band gap increasing from 1.03 to 1.27 eV in going from LaIn₃S₆ to LuIn₃S₆. Current-voltage, current-light, and photocurrent measurements demonstrate that LaIn₃S₆, SmIn₃S₆, GdIn₃S₆, HoIn₃S₆, and DyIn₃S₆ crystals are photosensitive in the near-IR spectral region.     

Modulation spectroscopy of solid solutions between II—VI compounds

The electroreflectance spectra and microhardness of Hg_0.8Cd_0.2Te, Hg_0.84Mn_0.16Te, and Hg_0.81Cd_0.18Mn_0.01Te crystals, whose surfaces were mechanically polished, chemically etched, and exposed to argon plasma, were studied. The thickness of the polishing damage layer was found to correlate with microhardness. The penetration depth of Ar⁺ ions in Hg_0.81Cd_0.18Mn_0.01Te was determined     

New technology of polymer-piezoceramic composites with high piezoelectric and electromechanical properties

A new technology of polymer-piezoceramic composites with high piezoelectric and electromechanical properties is described. The proposed technology is based on the crystallization of composites under the combined action of electric-discharge plasma and temperature (plasma-assisted thermocrystallization).     

Sorption Dynamics in a Reactor–Mass Exchanger Unit

A new pulsed membrane method and a reactor–mass exchanger unit for sorption in a fine-particle sorbent–liquid system are proposed. A mathematical model and a method of design are developed for units with a perfectly mixed or plug-flow reactor. The parameters of the sorption process in the unit are determined. The results obtained are collated with the results of simulation of the static and dynamic sorption processes.     

A magnetic field sensor based on the mechanoelectric effect in semiconductors

A highly sensitive magnetic field transducer based on the mechanoelectric effect in semiconductors is proposed.     

Phase diagrams of the CuSbS<Subscript>2</Subscript>-MS (M = Pb,Eu, Yb) systems

The phase equilibria in the pseudoternary systems CuSbS₂-MS (M = Pb, Eu, Yb) have been studied, and their phase diagrams have been mapped out. The systems contain MCuSbS₃ sulfides with an orthorhombic lattice, isostructural with the mineral bournonite (sp. gr. Pmn2₁, Z = 4). PbCuSbS₃: a = 8.162, b = 8.71, c = 7.81 Å; EuCuSbS₃: a = 8.156, b = 8.682, c = 7.786 Å; YbCuSbS₃: a = 8.150, b = 8.664, c = 7.78 Å.     

Immobilization of disperse red 1 onto polydiethyleneglycol-bis-allylcarbonate (CR-39) radiation grafted with poly(acryloyl chloride)

Abstract Acryloyl chloride (AC) was radiation grafted from 30% solution of monomer in toluene onto polydiethyleneglycol-bis-allylcarbonate (CR-39) by their simultaneous -iradiation. The grafting process was more efficient at dose rate of 4.4 kGy/h as compared with 0.4 kGy/h, and grafting values of 15-18% were achieved at 2.2-5.5 kGy. Subsequent immobilization of disperse red 1 (DR1) onto the grafted polymer was carried out from 0.02 M solution of this dye in dichloroethane, and the immobilized DR1 yield increased with the grafted polyAC value. Surfaces of the starting and modifed CR-39 were characterized with the FTIR-ATR spectroscopy and atomic force microscopy. An essential difference in chemical structure and topography of the CR-39 surface before and after the DR1 immobilization has been shown. The colourless plates of CR-39 became red after the DR1 immobilization, and the color intensity increased with the dye content. Changes in visible absorption spectra of the immobilzed DR1 caused by the photoinduced trans-cis isomerization of this dye were discussed.