Boron surface morphology

Boron-carbon coatings derived from C3H6 and CH4 are mixture with different microstructure and composition. SEM results showed that (B-C)p coating had a relatively smooth surface morphology... 

Figure.2 SEM photos of surface morphologies for boron carbide deposited at different temperature...

Nanocrystalline and amorphous nickel-boron films with different boron content were prepared by electrodeposition. Ability of various boron-containing compounds to be a source of boron was studied. Effects of boron content on the crystallite size, surface morphology, microhardness and wear resistance of the films were investigated. It was shown that the Ni-B films containing less than 14 at. % of boron had the nanocrystalline structure. The films became amorphous at boron content more than 14 at. %. Boron incorporation into nickel film and increasing the content of boron resulted in a decrease of the crystallite size, extension of grain boundaries and considerable increase in microhardness and wear resistance. 

The nature and concentration of boron-containing compounds affect substantially the film formation process, chemical and phase composition, structure and surface morphology of the resultant films. The ability of compounds to be a source of boron depends on either kinetic stability (i.e. the symmetry of anion) in the case of higher boranes or B-N bond strength for the borane complexes. 

The morphology of the films was characterized by scanning electron microscopy (SEM) with a JEOL JSM 5400 microscope. The surface morphology produced under the conditions used in this research consists in general of a highly faceted, polycrystalline film and uniformly deposited 5-pm diameter diamond crystallites can be obtained with good reproducibility from film to film. Fig. 2.3 shows a typical SEM image of a CVD boron-doped diamond film deposited in this way. 

Narmadha M, Noel M, Suryanarayanan V (2011) Relative deactivation of boron-doped diamond (BDD) and glassy carbon (GC) electrodes in different electrolyte media containing substituted phenols - voltammetric and surface morphologic studies. J Electroanal Chem 655 103-110... 

The electrochemical properties of Ir02 and RUO2 nanoparticles, deposited on synthetic boron-doped diamond (BDD) surfaces, are discussed. After a description of the preparation procedure and the morphological characterization of BDD/Ir02 and BDD/RUO2 samples, the dispersion efficiency of these oxides on BDD was estimated for different loading, using cyclic voltammetry. 

The relationships between solubility, supersaturation, pressure, and temperature depend upon the details of the microscopic mechanisms operative in the context of the detailed active impurity chemistry and the specific geometric relationship set up between the source carbon, molten metal solution, and nucleation site, and or growing diamond. For an introduction into these extensive subjects the reader is referred to Burns and Davies [16] where the issues such as nitrogen and boron active impurity chemistries, diamond surface reconstruction, morphology and solvent/catalyst are discussed. 

Studies of the evolution of structure formation of the boron nitride in the SHS wave showed that synthesis is accompanied by a sharp change of the scale of heterogeneity of the medium, even if the maximum process temperature was below the melting point of boron [26]. The initial boron powder consisted of agglomerates (specific surface 16 m g ) of spherical shape particles with a typical size of 0.1 pm (Figure 2.8a). The final product, that is, h-BN, has the morphology of plate crystals with the characteristic size of 20 pm and a thickness of less than 100 nm (Figure 2.8b). 

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