We report Monte Carlo simulations of the melting of a singlepolymer crystallite. We find that, unlike most atomic and molecular crystals, such crystallites can be heated appreciably above their melting temperature before they transform to the disordered ”coil” state. The surface of the superheated crystallite is found to be disordered. The thickness of the disordered layer increases with superh...

In this work, structural, microstructural, thermal, and magnetic properties of a Fe-25at%Al alloy produced by high-energy mechanical milling were investigated X-ray diffraction (XRD), scanning electron microscopy (SEM), differential calorimetry (DSC), vibrating sample magnetometry (VSM) techniques. At the early stage process, three phases, namely, Fe, Al, Fe(Al), coexist in milled powder. After...

In this study, we present mineralogical and geochemical characterization of samples systematically collected from a nickel laterite profile at the Sta. Cruz deposit, Zambales, Philippines. Wavelength-dispersive X-ray fluorescence spectroscopy (WDSXRF), mass-balance element mobility calculations, transmitted reflected light microscopy, previously reported results coupled diffraction (XRD) Rietve...

Nanoparticles of cubic CuFe2O4 are obtained in a fast microwave-assisted hydrothermal synthesis. By adjusting the pH value and solvent ratio (ethylene glycol to water), phase purity high crystallinity is achieved at very short reaction times 1 min, or low temperatures 120 °C, without need for subsequent heat treatment steps. The influence synthesis time temperature on material properties perfor...

We have investigated the crystallization of amorphous equiatomic NiTi thin films sandwiched between two protective silicon nitride barrier films using optical, atomic force, and transmission electron microscopy. Crystallite nucleation occurs homogeneously inside the NiTi films because small composition shifts at the interfaces between NiTi and surrounding layers suppress heterogeneous nucleatio...

A high-pressure silicon infiltration technique was applied to sinter diamond–SiC composites with different diamond crystal sizes. Composite samples were sintered at pressure 8 GPa and temperature 2170 K. The structure of composites was studied by evaluating x-ray diffraction peak profiles using Fourier coefficients of ab initio theoretical size and strain profiles. The composite samples have pr...

Present work aims to investigate effect of 100 MeV oxygen ion irradiation on the vibrational modes of zinc ferrite nanoparticles. Nanosize zinc ferrite systems of different crystallite size ranging from 12-62 nm were irradiated at the fluence of 1×10(13) and 5×10(13) ions/cm(2). High resolution transmission electron micrograph study indicates the structural disorder induced by ion irradiation. ...

modern vehicle bodies make intensive use of high strength steel grades to meet the contradicting demand of lighter weight and simultaneously better mechanical performance. for many steel grades microalloying by niobium is the key to achieve their characteristic property profile. in hsla steels niobium enhances the strength primarily by grain refinement. in interstitial free high strength steels...

A misalignment of anisotropic crystallites causes small values anisotropy and decreases the critical current density textured polycrystalline superconductors. To relate crystallite out-plane anisotropy, magnetic properties Bi2223 superconductor were investigated. distribution orientation angles was determined using different data: scanning electron microscopy images hysteresis magnetization loo...