ISSN:
0044-2313
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
A Contribution on the Crystal Chemistry of Oxotantalates. V. Ordered and Disordered Metal Distributions in MnZn2Ta2O8 and Mn0.33Zn0.67Ta2O6The compounds (I) MnZn2Ta2O8 and (II) Mn0.33Zn0.67Ta2O6 were prepared by solid state reactions. Single crystal X-ray investigations show (I): a = 19.286; b = 5.922; c = 5.228 Å; β = 90.3°; Z = 4; space group C2h6-C2/c; (II): a = 4.730; b = 17.154; c = 5.093 Å; Z = 4; space group D2h14-Pbcn. I belongs to the Zn3Nb2O8-type with ordered Mn2+, Zn2+ distribution. II crystalizes like tri-α-PbO2 (for example ZnTa2O6) but in respect to the metal distribution it belongs to the disordered α-PbO2-type.
Notes:
Mit Hilfe von Festkörperreaktionen wurden (I) MnZn2Ta2O8 und (II) Mn0,33Zn0,67Ta2O6 einkristallin dargestellt. [(I): a = 19,286; b = 5,922; c = 5,228 Å; β = 90,3°; Z = 4; Raumgruppe C2h6-C2/c; (II): a = 4,730; b = 17,154; c = 5,093 Å; Z = 4; Raumgruppe D2h14-Pbcn] I gehört zum Zn3Nb2O8-Typ mit geordneter Mn2+,Zn2+-Verteilung. Die Verwandtschaft zum Columbit wird aufgezeigt. II kristallisiert wie tri-α-PbO2 (z. B. ZnTa2O6), allerdings mit einer ungeordneten Metallverteilung, womit sie kristallchemisch zur α-PbO2-Struktur gehört.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19895720112