The mineral yuksporite (K,Ba)NaCa2(Si,Ti)4O11(F,OH)⋅H2O has been studied using the combination of SEM with EDX and vibrational spectroscopic techniques of Raman and infrared spectroscopy. Scanning electron microscopy shows a single pure phase with cleavage fragment up to 1.0 mm. Chemical analysis gave Si, Al, K, Na and Ti as the as major elements with small amounts of Mn, Ca, Fe and REE. Raman ...

The Induced Disjoint Paths problem is to test whether an graph G on n vertices with k distinct pairs of vertices (si, ti) contains paths P1, . . . , Pk such that Pi connects si and ti for i = 1, . . . , k, and Pi and Pj have neither common vertices nor adjacent vertices (except perhaps their ends) for 1 ≤ i < j ≤ k. We present a linear-time algorithm that solves Induced Disjoint Paths and finds...

The crystal structure of a layered ternary carbide, Ti3(Si0.43Ge0.57)C2, was studied with single-crystal X-ray diffraction. The compound has a hexagonal symmetry with space group P63/mmc and unit-cell parameters a 1⁄4 3.0823(1) Å, c 1⁄4 17.7702(6) Å, and V 1⁄4 146.21(1) Å. The Si and Ge atoms in the structure occupy the same crystallographic site surrounded by six Ti atoms at an average distanc...

In the past decades, a variety of self-aligned functional oxides have successfully been grown on a wide range of metals using electrochemical, self-organizing anodization. The earliest reports on highly ordered oxide structures included porous aluminum oxide layers grown by optimized anodization of Al in oxalic acid. These nanoporous oxides found a considerable number of direct applications, su...

In redox-dynamic soils, iron reduction-oxidation events may initiate wide shifts in the concentration of colloidal and dissolved material because of either Fe mineral dissolution or pH shifts associated with Fe oxidation state changes. This can have profound effects on the mobilization of organic and metal constituents. We conducted laboratory studies of colloid dynamics in a Hawaiian soil subj...

We perform first-principles calculations based on density-functional theory to investigate the role of interfaces in superhard nanocomposites. A prerequisite is clearly knowledge of the detailed atomic structure, which is addressed in the present paper. In particular, we study the relative stability of TiN 111 /SixNy/TiN 111 interfaces, which form in the highly thermally stable nc-TiN/a-SixNy n...

16 Multilayered structures with 14 to 50 nm periods composed of titanium and two different 17 titanium oxides, TiO and TiO2, were accurately produced by DC magnetron sputtering 18 using the reactive gas pulsing process (RGPP). Structure and composition of these 19 periodic TiO2/TiO/Ti stacks were investigated by X-ray diffraction (XRD) and 20 transmission electronic microscope (TEM) techniques....