Über den Einfluß kleiner Mengen Kieselsäure auf die Primärteilchengröße und Störstruktur von γ‐Al₂O₃

Abstract

Es werden Fällungen von Böhmit (γAlOOH) mit verschiedenen Kieselsäuregehalten hergestellt und 2 Stunden lang auf Temperaturen zwischen 500° und 900° erhitzt. Die so gewonnenen Präparate werden röntgenographisch nach v. Laue‐Brill‐Kochendörfer auf Primärteilchengrößen und nach Fricke‐Gewinner auf Gitterstörungen untersucht.

Thermodynamic Properties of the Oxides of Fe, Ni, Pb, Cu, and Mn, by EMF Measurements

“…However, Ni-saturated NiO is known to be stoichiometric (28), and solid Ni metal dissolves very little oxygen until 1438~ (29), which contributes to making the Ni-NiO system ideal as a reference electrode for use with solid electrolytes at temperatures between 500 ~ and 1400~ The present results are in reasonably good agreement with other data. The standard free energies of formation of NiO calculated from thermochemical data have tended to agree increasingly with equilibrium measurements in the last few years, e.g., ___200 to ~500 cal at 1000~ (30,2,(31)(32)(33) as shown in part by Chipman (34). The values of Coughlin (35) and Kubaschewski and Evans (1), however, are out by as much as 1.7 kcal at 1000~…”

Measurements on Galvanic Cells Involving Solid Electrolytes

“…0.85 ZrO, + 0.15 CaO) I Ni, NiO (V) are shown in Table IV (21), and Fricke and Weltbrecht (22). Since the COJCO ratios over nickel and nickel oxide are fairly large (63 to 454), errors For a comparison, Table IV lists standard molar free energies of the formation of nickel oxide recommended by Coughlin (11).…”

The Spreading of Liquid Metals on Solid Surfaces. Surface Chemistry of High-Energy Substances.

“…ergs/cm. * 560 Heat of solution (21) CdO...................................... 500 Heat of solution (21) CuO...................................... <760 Heat of solution(21) 7-ß 3................................... 350 Heat of solution (21) MgO...................................... 1400 Heat capacity (32) Mg(OH)i cryet............................ 330 Heat of solution (21) SbsOg.....................................140Heat of solution(24)…”