A modification of the modulated elemental reactants synthetic technique was developed and used to synthesize eleven members of the [(SnSe) 1.15 ] m (TaSe 2 ) n family of compounds, with m and n equal to integer values between 1 and 6. Each of the intergrowth compounds contained highly oriented intergrowths of SnSe bilayers and TaSe 2 monolayers with abrupt interfaces perpendicular to the c-axis. The c-lattice parameter increased 0.579(1) nm per SnSe bilayer and 0.649(1) nm per Se−Ta−Se trilayer (TaSe 2 ) as m and n were varied. ab-plane X-ray diffraction patterns and transmission electron microscope images revealed a square in-plane structure of the SnSe constituent, a hexagonal in-plane structure for the TaSe 2 constituent, and rotational disorder between the constituent layers. Temperature dependent electrical resistivity, measured on several specimens, revealed metallic behavior, and a simple model is presented to explain the differences in resistivity as a function of m and n.

Compounds. -The title ferecrystals (fere: Latin, almost) with 1 ≤ n,m ≤ 6 and n and m varied independently are prepared by physical vapor deposition of the elements followed by annealing at 400°C for 30 min. The samples are characterized by XRD, HRTEM, and electrical measurements. Each of the intergrowth compounds contains highly oriented intergrowths of SnSe bilayers and TaSe 2 monolayers with a square in-plane structure of the SnSe constituent, a hexagonal in-plane structure for the TaSe2 constituent, and rotational disorder between the constituent layers. Temperature dependent electrical resistivity reveals metallic behavior for all compounds. A simple model explains the difference in resistivity as a function of m and n. -(ATKINS, R.; WILSON, J.; ZSCHACK, P.; GROSSE, C.; NEUMANN, W.; JOHNSON*, D. C.; Chem. Mater. 24 (2012) 23, 4594-4599, http://dx.

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Thermal and Photochemical Exchange Reactions of Bromine 3519 for this and the chlorine-hydrogen peroxide reaction seems strong enough to warrant their revision. One such revision has been carried out.Anomalies in the temperature coefficients of processes in aqueous iodine solutions find no counterpart in the absorption of visible light by these solutions. Gaseous iodine in air and iodine dissolved in carbon tetrachloride are virtually indistinguishable with a spectrophotometer. Aqueous iodine solutions differ from them in three spectrophotometrically measurable ways.Schenectady, N. Y.

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