ISSN:
0044-2313
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
On Ordered Variants of the NaCl Type of Structure: New Cubic Forms of NaMO2 (M = Sc, Y, Dy, Tm, Yb, Lu), K2MO3, Rb2MO3 (M = Ce, Pr, Th), and Cs2ThO3We obtained hithertoo unknown cubic forms of NaScO2 (a = 4.525 Å), NaYO2 (a = 4.791 Å), NaDyO2 (a = 4.800 Å), NaTmO2 (a = 4.743Å), NaYbO2 (a = 4.730 Å), NaLuO2 (a = 4.715 Å) [all colourless], K2CeO3 (a = 5.203 Å), K2PrO3 (a = 5.185 Å), K2ThO3 (a = 5.308 Å), Rb2CeO3 (a = 5.397 Å), Rb2PrO3 (a = 5.367 Å), Rb2ThO3 (a = 5.475 Å), and Cs2ThO3 (a = 5.704 Å) [colour see ins.] by heating mixtures of the binary oxides AOx (A = Na, K, Rb, Cs) with active forms of M2O3, respectively. It is discussed MO2, how one may understand the existence of the cubic forms, which according to powder data show a statistical distribution of cations (with different charge and ionic radius).
Notes:
Neu dargestellt wurden durch Tempern inniger Gemenge von aktiven Oxiden M2O3 bzw. MO2 und Alkalioxiden AOx (A = Na, K, Rb, Cs) bislang unbekannte kubische Formen von NaScO2 (a = 4,525 Å), NaYO2 (a = 4,791 Å), NaDyO2 (a = 4,800 Å), NaTmO2 (a = 4,743 Å), NaYbO2 (a = 4,730 Å), NaLuO2 (a = 4,715 Å) [alle farblos], K2CeO3 (a = 5,203 Å), K2PrO3 (a = 5,185 Å), K2ThO3 (a = 5,308 Å), Rb2CeO3 (a = 5,397 Å), Rb2PrO3 (a = 5,367 Å), Rb2ThO3 (a = 5,475 Å) und Cs2ThO3 (a = 5,704 Å) [Farben siehe Text]. Es wird diskutiert, wie das Auftreten dieser Formen, deren Pulveraufnahmen auf statistische Verteilung der Kationen unterschiedlicher Ladung und Größe hindeuten, zu verstehen sein könnte.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19774300114
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