Tantalum Oxides by Gasphase Hydrolysis, Pressure Digestion, and Chemical Transport of 2H‐TaS2: Synthesis of TT‐Ta2O5, T‐Ta2O5 and X‐ray Structure Determination of T‐Ta2O5 TT‐Ta2O5 is obtained by pressure digestion in water using 2H‐TaS2 as starting material at a temperature of 200°C followed by a dehydratization procedure of initially formed amorphous HTaO3. The X‐ray powder diagram of TT‐Ta2O5 revealed a hexagonal unit cell with space group P6/mmm and lattice constants a = 3.639, c = 3.901 Å. This material undergoes a phase transition during heating from 20 to 900°C. The resulting product is crystallizing orthorhombic with space group Pmm2 and lattice constants a = 43.997(8), b = 3.894(1), c = 6.209(3) Å and Z = 12. Single crystals of this phase (T‐Ta2O5) have been prepared by chemical transport reaction using TT‐Ta2O5 as starting material and NH4Cl as transport agent. The structure of T‐Ta2O5 consists of pentagonal‐bipyramidal coordinated tantalum atoms connected with distorted TaO6 octahedra. The Ta–O distances vary between 1.84 and 3.09 Å and the mean Ta–O distance is 1.99 Å.

Neuroeconomics has the potential to fundamentally change the way economics is done. This article identifies the ways in which this will occur, pitfalls of this approach, and areas where progress has already been made. The value of neuroeconomics studies for social policy lies in the quality, replicability, and relevance of the research produced. While most economists will not contribute to the neuroeconomics literature, we contend that most economists should be reading these studies.

No abstract

No abstract

Ternary phases Ta1-xMoxS2 with 0.25 ≤ x ≤ 0.55 have been investigated regarding their intercalation potential using pyridine as guest molecule. Intercalation yields hexagonal phases Ta1-xMoxS2·(pyridine)n. The different phases have been characterized by elemental analysis as well as TGA and powder diffraction patterns, which have been indexed using the space group P3m1. For the compound Ta0.65Mo0.35S2·(pyridine)0.38 a structural model was developed, based on powder diffraction data: P3m1, a = 3.275(2), c = 12.008(7)Å and Z = 1. During intercalation the stacking sequence of the host lattice is changed from BaB/AcA/CbC to BaB(pyr)/BaB(pyr). Intercalation of pyridine into Ta1-xMoxS2 proceeds via a two-step mechanism. In the first step orthorhombic phases are formed with reduced pyridine content as compared to the final intercalation product; e.g. Ta0.55Mo0.45S2·(pyridine)0.38. The first step intercalation compounds can be obtained by interruption of the intercalation reaction after 7 days.