Materials Literature
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We present Monte Carlo simulations for a classical antiferromagnetic Heisenberg model with both nearest (${J}_{1}$) and next-nearest (${J}_{2}$) exchange couplings on the square lattice in the presence of nonmagnetic impurities. We show that the order-by-disorder entropy selection, associated with the Ising-like phase…
Resistivity and magnetic susceptibility measurements under external pressure were performed on NaFe 1− x Co x As ( x = 0, 0.01, 0.028, 0.075 and 0.109) single crystals. For both underdoped and optimally doped NaFe 1− x Co x As, the maximum T c reached as high as 31 K under certain pressures. Meanwhile the overdoped sa…
Abstract Piezoelectric ceramics system of Pb((Zn 1/3 Nb 2/3 ) 0.20 –(Zr 0.50 Ti 0.50 ) 0.80 )O 3 (0.2PZN–0.8PZT) was prepared by the conventional oxide mixing method. The dependences of the internal‐bias field and electric properties on the sintering temperature were investigated systematically. The results indicated…
This article discusses thermal analysis of different molecular weight poly(2-ethylhexyl acrylates) synthesized by radical polymerization of 2-ethylhexyl acrylate. The main aim of this work was to investigate the thermal properties and degradation process of synthesized acrylic homopolymers and forming of thermal degra…
According to 1 H NMR study in fcc hydrides of disordered Ti-V alloys hydrogen atoms are distributed over both octahedral and tetrahedral sites. The occupancy of octahedral sites increases with the vanadium concentration. In hydrides of ternary Ti-V-Cr alloys hydrogen atoms occupy tetrahedral sites only.
We study the structural and electronic properties of scandium carbide ScC and niobium carbide NbC in both the sodium chloride rock salt (NaCl) and wurtzite structures by means of accurate first principles total energy calculations. The calculations were performed employing the full-potential linearized plane wave meth…
The local domain structure of a strain free, 150 nm thick, epitaxially grown single crystalline thin film of CaCu(3)Ti(4)O(12) is probed by polarized Raman spectroscopy. The polarization dependence of the Raman intensities of the observed bands as a function of varying angle between the domain axes and the polarizatio…
Abstract. In this review paper comparison of magnetic properties in several MM’X-type intermetallics is presented. It may be summarized that main role in variation of magnetic interactions is played by modification of metallic sublattice in the tetrahedral but not in the pyramidal sites. It was shown not only in the c…
Carbon nanotubes were produced from the aerosol-assisted catalytic CVD method using palm oil as the precursor and ferrocene as the catalyst. The CNTs were yielded at optimized temperature of 700oC and the Field Emission Scanning Electron Microscope showed the image of CNTs produced. Raman Spectroscopy, energy dispersi…
In the present work protonic forms of layered n=1 Ruddlesden-Popper oxides HLnTiO 4 (Ln=La, Nd) were used as starting point for synthesis of three series of the perovskite-like compounds. Characterization by SEM, powder XRD and TGA has been performed for the determination of the structure and composition of synthesize…
We report thermally stimulated current (TSC) experiments on graphene oxide (GO) to study the effects of various defect levels near the GO Fermi level. The TSC peaks are ascribed to detrapping from defect levels to the GO hopping transport energy level, and are found to be in agreement with the GO density of states rep…
The crystal structures of the binary cadmium-rich complex metal alloys NiCd6+δ (−0.32 ≤ δ ≤ 0.35) and NiCd1+δ (0 ≤ δ ≤ 0.05) were studied by means of single crystal X-ray diffraction. The partitioning of the NiCd6+δ structure into clusters grouped around all 16 high symmetry points of the face centered cubic cell lead…
The uniaxial tensile creep tests of the double-base solid propellant specimens were carried out at 450C under five different stress levels. The viscoelastic models such as three parameters solid model, Burgers model, generalized Kelvin model, five parameters solid model and exponential model were adopted. The computat…
A new method for the surface modification of the surface of fruits based on the Layer-by-Layer (LbL) deposition of polyelectrolyte multilayers (PEM) is presented. Mangoes fruits were coated by sequential dipping in solutions of either Poly(diallyldimethylammonium chloride), (PDADMAC) or Poly(styrene sulfonate sodium s…
The new hybrid material, (C 4 H 12 N 2 )[Co(H 2 O) 4 (SeO 4 ) 2 ]·2H 2 O, has been synthesized by the slow evaporation method at room temperature and crystallographically characterized. It crystallizes in the monoclinic system, space group P21 /n. The crystal structure of this compound consists of transition metal, Co…
Abstract Growth processes of nanocomposite layers obtained by polyelectrolytes, poly(sodium 4-styrenesulfonate) (PSS) and poly(diallyldimethylammonium chloride) (PDADMAC), self-assembled on silicon surface using layer-by-layer (LbL) technique were investigated, and theoretical and experimental data are herein reported…
Inside spaces of emulsion droplets can be used as mini-reactors for material synthesis. The novel application of sol-gel derived silicone oil droplets as mini-reactors was examined for the case of polymerization of styrene (St) and comonomers with the oil-soluble initiator 2,2'-azobis(2,4-dimethylvaleronitrile). Polyd…
Magnetic susceptibility measurements revealed a disordered state of magnetic moments above 4.2 K for all compounds under study, and a weak response to the magnetic field and the temperature for Sm 2 W 2 O 9 and Eu 2 W 2 O 9 tungstates. The temperature independent component of magnetic susceptibility has a positive val…
The growth of high quality protein crystals is essential for the determination of their structure. This process is governed by many physical factors such as mass transport and solution flow. The quality of the crystals is usually better under diffusion-limited growth conditions, where a depleted zone of the solution e…
Zr-based AB 2 -Laves phase type alloys containing the same type of A and B metals, have been prepared from pure elements by melting and subsequent re-melting under argon atmosphere by using a HF-induction levitation furnace. Characterization of the alloys has resulted from powder X-Ray Diffraction (XRD) measurements a…