Materials Literature
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The stable capillary growth conditions for pulling, from melt, 500-mm-long fiber crystals with constant diameter in the region 150–270 µm by the micro-pulling-down method are investigated. As a model, a substance with the sapphire/YAG eutectic composition is used. The experimental results are compared with theoretical…
Abstract The nanocrystalline cubic phase of zirconia was found to be thermally stabilized by the addition of 3 to 40 mol % manganese. The nanocrystalline cubic, tetragonal and monoclinic phases of zirconia stabilized with manganese (III)oxide (Mn‐Stabilized Zirconia) were prepared by thermal decomposition of carbonate…
The kinetics of photoluminescence (PL) and steady-state PL from silicon nanocrystals formed in the SiO 2 matrix by silicon ion implantation were studied experimentally for the first time in the temperature range from liquid-helium to room temperature. A dramatic increase in the photoluminescence decay time, accompanie…
Abstract Phthalocyanines peripherally introduced with four phenyl derivatives have been prepared from the corresponding phthalonitriles, which were obtained in high yields with Suzuki-Miyaura coupling. It was found that the substituent groups on the pc ring significantly affect the spectral properties and solubilities…
Abstract The nanocrystalline cubic, tetragonal, and submicron monoclinic phases of pure zirconia were prepared by thermal decomposition of carbonate and hydroxide precursors. The crystallization and isothermal phase transformations of the oxide were studied using high temperature X‐ray diffraction, X‐ray diffraction a…
Ba 0.8 Sr 0.2 TiO 3 thin films were prepared with various individual layer thicknesses using a sol–gel process. The individual layer thickness strongly affected the structure, ferroelectricity, and dielectric properties of the films. The films prepared with an individual layer thickness of 60 nm showed small equiaxed…
The magnetic viscosity coefficient S, susceptibility and recoil curves were measured by SQUID for nanocrystalline ${\mathrm{Sm}}_{2}{\mathrm{Fe}}_{15}{\mathrm{Si}}_{2}\mathrm{C}$ ribbons at temperatures ranging from 50 K to room temperature. It was found that the effect of strong intergrain exchange coupling on S and…
For the first time, ZnS:Cu films with an intense photoluminescence were prepared by a chemical nonvacuum method. They were produced by means of the combined pyrolytic deposition of zinc and copper dithiocarbamates onto glass and ceramic substrates heated up to 260–300°C. A close packing of practically identical grains…
The performance of a CsI photocathode for hard x rays (8–46 keV) was compared to a Au photocathode using synchrotron radiation. We found that the sensitivity of CsI (100 nm thick) is 20–100 times higher than that of Au (30 nm thick), depending on the photon energy. The time response for 40 ps pulses is also improved s…
Thermal conductivity measurements have been carried out on single crystals of ${\mathrm{SrTiO}}_{3}$ and ${\mathrm{KTaO}}_{3}$ in the presence of electric fields applied either perpendicular or parallel to the heat current. In the case of ${\mathrm{SrTiO}}_{3},$ the response is surprisingly large: a 7 kV/cm parallel f…
A new low molar mass chiral-photochromic dopant was synthesized. It contains a menthyl fragment as the chiral group and an azobenzene group, capable of E - Z photoisomerization, as the photochromic component. The substance obtained was used as a chiral dopant in mixtures with a comb-shaped cholesteric acrylic copolyme…
Compact tension specimens of nitrogen-added AISI type 316 austenitic stainless steel and its weld metal were subjected to stress corrosion cracking (SCC) testing in a boiling solution containing 5 M sodium chloride + 0.15 M sodium sulphate + 2.5 ml/l hydrochloric acid solution using the constant extension rate testing…
Flax fibers with different moisture content were used as reinforcement in polypropylene matrix with maleic anhydride grafted polypropylene coupling agent. Mechanical properties-three point bending and Izod impact strength-were investigated as a function of moisture content of the fiber, and amount of applied coupling…
Whereas plants and animals use the alpha-aminoadipic acid pathway to catabolize lysine, yeast and fungi use the very same pathway to synthesize lysine. These two groups of organisms also possess structurally distinct forms of two enzymes in this pathway, namely lysine-oxoglutarate reductase (lysine-ketoglutarate reduc…
This review addresses a number of aspects of electron energy loss spectroscopy (EELS) for quantitative analysis, including: procedures for the quantification of EELS elemental analysis and mapping with an indication of the accuracies and detection sensitivities; procedures for the extraction of valence band electronic…
Attempts to build up polyanionic networks on the basis of thiocyanatometallates of CuI and AgI led to the synthesis of three new tris(thiocyanato)dimetallates(I) A[M2(SCN)3] with M = Cu, Ag and A = Me3NH and A = [Me2CNMe2]. The crystal structures show distorted tetrahedral [M(SCN)3(NCS)] and [M(SCN)2(NCS)2] building g…
The paper presents the results of a complex investigation into the dynamics of electronic excitations in the CsLiB 6 O 10 crystal (CLBO) by low-temperature luminescence VUV spectroscopy with subnanosecond time resolution under photoexcitation by synchrotron radiation. Strong broad-band low-temperature photoluminescenc…
Abstract The crystal structure of faustite, ZnAl 6 (PO 4 ) 4 (OH) 8 .4H 2 O, was determined using single-crystal data (Mo-Kα X-radiation, CCD area detector, 1624 unique reflections, R 1 = 4.91%, w R 2 = 9.23%), and compared with results of a reinvestigation of the structure of its copper analogue turquoise, CuAl 6 (PO…
Tumchaite, Na 2 (Zr,Sn)Si 4 O 11 ·2H 2 O, is a new species from the Vuoriyarvi alkali-ultrabasic massif, Murmansk Region, Russia, where it occurs as colorless to white tabular monoclinic crystals associated with calcite, dolomite, a mineral of the serpentine group and pyrite in the late dolomitecalcite carbonatites. I…
The crystal structure of tetracalcium trialuminate (Ca 4 Al 6 O 13 ), synthesized at 1250 °C and 2.5 GPa, has been determined from single-crystal X-ray data by direct methods [space group Pcan, Z = 8, a = 5.3002(2) Å, b = 17.7610(5), c = 21.0887(9) Å] and refined to R1 = 6.42%. The unit cell parameters of Ca 4 Al 6 O…