THE PURITY OF ATOMIC WEIGHT SILVER. II. SOLID IMPURITIES

Treasure of the Past: II: The Atomic Weight of Bromine

This paper from the Bulletin of the Bureau of Standards , Vol. 9, No. 1, 1913, pp. 131–150, is reprinted to commemorate the NIST Centennial on March 3, 2001. Ten papers have been selected from the Journal and its predecessors for this purpose, one from each decade of NIST’s existence. They appear in 10 of the 12 issues of the Journal published in 2000 and 2001, starting with the March–April 200...

Determination of Metal Impurities in Carbon Nanotubes by Direct Solid Sampling Electrothermal Atomic Absorption Spectrometry

A determinação de Al, Cd, Co, Cr, Cu, Mg, Mn e Pb em nanotubos de carbono (CNTs) foi realizada por espectrometria de absorção atômica com atomização eletrotérmica e amostragem direta de sólidos (DSS-ET AAS, corretor de fundo com fonte de deutério). Foram avaliados os parâmetros de aquecimento, uso de Pd como modificador químico, possibilidade de calibração com soluções aquosas e massa máxima de...

Silver solid solution piezoelectrics

Using density functional theory calculations, we investigate the feasibility of using silver on the perovskite A-site in high-performance lead-free piezoelectrics. The calculations show that silver atoms are ferroelectrically active and can off-center by 0.5 Å. To induce Ag ferroelctric behavior absent in pure AgNbO3 we explore solid solutions of AgNbO3 with well-known simple perovskites PbTiO3...

Impurities in High Molecular Weight Amine Products

Calculation of hydrodynamic mass for atomic impurities in helium.

We present a simple numerical procedure for calculating the irrotational hydrodynamic flow around a spherical solute in superfluid helium. The results for alkali cations are compared to recent many-body variational Monte Carlo (VMC) calculations. The helium contribution to the effective masses calculated by the VMC and hydrodynamic methods are 12.9(4.6) versus 9.4 u for Li+, 48.2(5.6) versus 52...