Key Engineering Materials Vol. 508

Abstract: A Spin Current Generated by Spin Pumping in a Ferromagnetic/Nonmagnetic/Spin-Sink Trilayer Film Is Calculated Based on the Spin Pumping Theory and the Standard Spin Diffusion Equation. By Attaching the Spin-Sink Layer, the Injected Spin Current Is Drastically Enhanced when the Interlayer Thickness Is Shorter than the Spin Diffusion Length of the Interlayer. We Also Provided the Formula of the Charge Current which Is Induced from the Pumped Spin Current via the Inverse Spin-Hall Effect.

Abstract: Damping Materials Have Been Wildly Used in Aerospace, Traffic, Construction Fields and so on. The Piezo-Damping Materials Have Received much Attention due to the Novel Energy Loss Mechanism. In this Paper, Piezo-Damping Composite Materials Were Prepared from the Epoxy Resin (EP) as the Resin Matrix, Nano Lead Titanate (Nano-PT) Ceramics as Piezoelectric Material and Chopped Carbon Fibers (CF) as Conductive Materials. The Mechanical and Damping Properties of the Composites Were Analyzed by Mechanics Test, DMA and Vibration Beam Method. The Results Showed that when the Nano-PT Content Was 60% of EP and CF Content Was 0.25% of EP, the Composite Got the Better Mechanical Properties. Form DMA, the Loss Factor (tanδ) Peak Reached 0.58. Damping Temperature Range △T (tanδ>0.3) Was about 36.3°C. In Comparison, Damping Loss Factor Measured by Vibration Beam Method Was 0.82.

Abstract: Titania (TiO₂) Films Having Dense and Solid Microstructure Were Prepared by Laser Chemical Vapor Deposition Using CO₂ Laser. The Effects of Deposition Temperature (T_dep) and Total Chamber Pressure (P_tot) on Phase and Microstructure of TiO₂ Films Were Investigated. At P_tot = 600 Pa and T_dep = 790 K, Rutile TiO₂ Film Had a Polygonal Platelet Grains 2 μm in Size. At P_tot = 600 Pa and T_dep = 1010 K, Rutile TiO₂ Film Had (110) Orientation and Consisted of a Truncated Polyhedron 5–6 μm in Size. At P_tot = 200 Pa and T_dep = 955 K, Rutile TiO₂ Film Has a Solid Columnar Having Faceted Surface. A Dense and Solid TiO₂ Film Was Obtained at P_tot = 200 Pa and T_dep = 1120 K. The Deposition Rate of TiO₂ Solid Film Was Reached 240 μm h⁻¹.

Abstract: The SiC_xN_yH_z Films Were Prepared by PECVD Method Using Organosilicon Volatile Compound Hexamethyldisilazane as a Precursor. Some Important Physical and Chemical Properties Were Studied by the Complex of Modern Physical Methods. It Was Shown that at Low Deposition Temperatures the Films Contain the Chemical Bonds of Organic Nature and Have Low Values of Young’s Modulus, Refractive Index and Density. They Possess High Elasticity which Indicates to their Polymeric-Like Structure. At Higher Deposition Temperatures the Films Are Inorganic Composite Materials Consisting of Amorphous Part and Nanocrystals of Graphite and Silicon Nitride. Decrease in Optical Band Gap and Coefficient of Thermal Expansion Is Observed with Deposition Temperature Increase.

Abstract: New Magnesium-Ion Conductors, TM-Doped Mg_0.5Ti₂(PO₄)₃ (TM = Fe, Mn, Co and Nb), Have Been Prepared by Sol-Gel Method. In Addition, their Crystal Structure Has Been Refined by Rietveld Technique and the Conductivity Has Been Evaluated by Ac Impedance Method. The Samples Were Sintered at 1150°C for 2 H (Fe, Mn and Co) or 1200°C for 10 H (Nb). For All Samples, Three Resistance Components Attributed to Grain, Grain Boundary and the Interface of Electrolyte-Electrode Were Successfully Separated as a Result of Sintering Accompanied by Grain Growth Reaching to 5 to 10 µm. The Change of Ionic Conductivity Will Be Discussed in Relation to the Dopants and their Crystal Structures.

Abstract: Lithium Cobaltate (LiCoO₂) Films Were Prepared on the (001), (110), (110) and (112) Planes of Al₂O₃ Single Crystals Substrates by Metal Organic Chemical Vapor Deposition, and the Phases, Orientated Textures and Surface Morphologies Were Examined. (001)-Oriented LiCoO₂ Films Were Obtained on (001) and (110) Al₂O₃ Substrates, while (018)- and (104)-Oriented LiCoO₂ Films Were Grown on (110) and (112) Al₂O₃ Substrate. Triangular and Elongated Rectangular Faceted Structures Were Directionally Aligned, and (001)- and (018)-Oriented Grains Were Epitaxially Grown on (001) and (110) Al₂O₃ Substrates. Randomly Arranged Polygonal Faceted Structures Were Observed in the (001)-Oriented Licoo2 Film on (110) Al₂O₃ Substrate, while Locally Inhomogeneous Grains Were Observed in the (104)-Oriented LiCoO₂ Film on (1_,12) Al₂O₃ Substrate.

Abstract: Structures of Raney Ru(Ni) Fine Particles Were Investigated by High-Energy X-Ray Diffraction Coupled with Anomalous X-Ray Scattering (AXS) at the Ni K-Absorption Edge. Raney Ru(Ni) Fine Particles Were Prepared from Monoclinic-Al₁₃(Ru,Ni)₄, by the Leaching with Naoh Aqueous Solution. Ordinary PDF for Raney Ru Indicates Atomic Correlations Similar to those for Hcp-Ru. However, a Correlation Peak at about 0.2 Nm which Could Not Be Described by the Atomic Correlations in the hcp-Typed Structure Is Developed as a Function of the Ni Content. The Environmental RDF around Ni Clearly Reproduced this Interesting Correlation Together with an Indication of the hcp-Typed Structure in the Middle Range Region. These Experimental Results Suggested that the Partially Oxidized hcp-Typed Ru(Ni) Fine Particles Were Obtained by the Present Leaching Process.

Abstract: It Has Been Reported that the Metal Hydride, Ymn2hy (y ≤ 4.5), Wherein the Hydrogen Atoms Are Located into the Interstitial Sites, Transformed into a Complex Hydride, YMn₂H₆, Containing Complex Anions, [MnH₆]^5-. We Investigated the Possibility of Synthesizing the Complex Hydride, Y(Mn_1-xFe_x)²H₆ (x ≤ 0.3), where Mn Atoms Were Partially Substituted by Fe. As a Result, the Transformation into the Complex Hydride, Y(Mn1-Xfex)2H6, Was Successfully Realized for x ≤ 0.10 upon the Hydrogenation of the Metal Hydride, Y(Mn_1-xFe_x)₂H_y (y = 4.4 and 4.5), under 50 Mpa H₂, much Lower than the Previously Reported Value of 1 GPa. Our Structural Investigation Suggested that the Fe Substitution in Y(Mn_1-xFe_x)₂H₆ (x ≤ 0.10) Resulted in the Form of Complex Anions, I.e., [MnH₆]^5- Were Partially Substituted by [FeH₆]^4-.

Abstract: The Phenomenon of Laser-Induced Discharging in an Organic Photoconductor Sample Was Directly Observed Using Electron Holography and Sophisticated Techniques for In Situ Observations. Mechanical Friction Was Used to Induce Negative Tribocharges on the Surface of the Photoconductor Sample. the Observation of Equipotential Contour Lines (i.e., the Electric Potential Distribution) outside the Specimen Revealed that the Amount of Tribocharges Was Reduced by the Laser Exposure. Computer Simulations of the Equipotential Lines Provided Useful Information for Evaluating the Quantity of Tribocharges.