Observations on Columbium.

Abstract

From the first crystallization, 8. 5 kilograms. From the second crystallization, 3. 4 kilograms. From the third crystallization, 2. z kilograms. From the fourth crystallization, I 5 kilograms (crystals A)

1–370 GHz EPR Linewidths for K3CrO8: A Comprehensive Test for the Anderson–Weiss Model

“…Powder of K 3 NbO 8 doped with K 3 CrO 8 in small amounts was made by the method of Balke and Smith (17). EPR measurements confirmed that the doping was successful at about the 0.5% level, in agreement with our earlier studies (13).…”

Electrochemical Investigation of Surface Reactions for Chemical Mechanical Planarization of Tantalum in Oxalic Acid Solutions

“…[29][30][31][32][33][34][35] For the nonalkaline solutions used here, the relevant anionic complexes of Ta are the tetraperoxotantallate anion, ͓Ta͑O 2 ͒ 4 ͔ 3− , and the tantalum diperoxo anion, ͓Ta͑O 29 While the formation of the second complex requires the presence of HL − and/or L 2− in the solution, the first complex can form without the direct involvement of OA. [29][30][31][32][33][34][35][36] Because the surface reactivity of Ta in aqueous electrolytes is determined by that of its overlying native Ta 2 O 5 film, the aforementioned complex formation reactions must also be supported by this oxide layer. Previously published results suggest that such reactions occur through the production of an intermediate hydroxide species.…”

Structure des complexes peroxydiques des métaux de transition. III. Structure cristalline du tétraperoxoniobate de potassium et de magnésium à sept molécules d'eau, KMgNb(O2)4.7H2O

“…Le compos6 KMgNbOs.7H20 a 6t6 signal6 par Balke & Smith (1908), qui l'obtenaient sous forme de pr6cipit6 floconneux par double d6composition entre le chlorttre de magn6sium et le perorthoniobate de potassium. Nous l'avons obtenu en faisant r6agir la magn6sie sur une solution de niobate de potassium dans de l'eau oxyg6n6e ~ 20 %.…”