Metallurgy of M-GaAs contacts (M=W, Re, Si)

Ion-exchanged geopolymer for photocatalytic degradation of a volatile organic compound

“…for the degradation of 2-butanone by TiO 2 (P25 Degussa) over a fiberglass support [6]. In addition, chromatograph exhibited the presence of 2-etil-1-hexene (retention time at 2.26 min) whose appearance has not been reported previously, and that could be formed by the linking of alkyl radicals.…”

“…They are synthesized at low temperatures by chemical reaction between aluminosilicates and alkaline polisilicates [1]. Their applications are wide; including the immobilization of toxic and radioactive waste [2,3], support for catalytic materials [4,5] and adsorber for volatile organic compounds (VOC) as formaldehyde [6]. VOC's are human-made and naturally occurring chemical compounds that stand high on the list of the pollutants detected in indoor atmospheres [7,8].…”

Condensed phase equilibria in transition metal-Ga-Sb systems and predictions for thermally stable contacts to GaSb

“…The hypothetical Ga-Re phase diagram, given by Massalski et al, is characterized by the absence of intermetallic phases, 22 but an intermediate phase, ReGa 5 , which melts peritectically at 764˚C, was reported in more recent work by Han and Schmid-Fetzer. 23 With an estimated ∆ f H˚ ϭ Ϫ5 kJ/mol·atoms for the ReGa 5 phase 48 and no known intermediate phases in the binary Re-Sb system, Re is predicted to be stable on Table I Ϫ30 -A IrGa 6 22 GaSb. Interestingly, the ∆ f G˚ of ReGa 5 would have to be more negative than Ϫ17.5 kJ/mol·atom for Re to be favored to react with GaSb at 298 K. Hence, this prediction is made with an encouraging degree of certainty.…”

Titanium and Titanium Alloys

“…Titanium is a preferred material of construction since it is not affected much by a temporary lack of oxygen [69]. The corrosivity of urea has been linked to an amino-formic acid intermediate [70].…”