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Cerwolframat
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
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Contents
β’ Eigenschaften
β’ Einzelnachweise
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Gewinnung und Darstellung
Cerwolframat kann durch Reaktion von Cer(III)-nitrat mit Natriumwolframat gewonnen werden.cite-ref-smritimoy-pramanik-2-0[2] Es kann auch durch Reaktion von Wolfram(VI)-oxid mit Cerdioxid bei Temperaturen um 1500 Β°C gewonnen werden.
4 C e O 2 + 6 W O 3 βΆ βΆ 2 C e 2 ( W O 4 ) 3 + O 2 {\displaystyle \mathrm {4\ CeO_{2}+6\ WO_{3}\longrightarrow 2\ Ce_{2}(WO_{4})_{3}+O_{2}} }
Im System Ce2O3-WO3 wurden acht Phasen mit den Zusammensetzungen 3Ce2O3Β·WO3, 3Ce2O3Β·2WO3, Ξ±-Ce2O3Β·WO3, Ξ²-Ce2O3Β·WO3, Ξ±-Ce2O3Β·2WO3, Ξ²-Ce2O3Β·2WO3, Ce2O3Β·3WO3 und 2Ce2O3Β·9WO3 gefunden. Hiervon sind die Hochtemperatur-Phasen (Ξ²) metastabil.cite-ref-doi10-1515-znb-1995-1013-3-0[3]
Eigenschaften
Cerwolframat ist ein weiΓlicher geruchloser Feststoff, der praktisch unlΓΆslich in Wasser ist.cite-ref-alfa-1-7[1] Er besitzt eine monokline Kristallstruktur, die isotyp zu der von Europiumwolframat ist mit der Raumgruppe C2/c (Raumgruppen-Nr. 15)Vorlage:Raumgruppe/15 (a = 7,813, b = 11,720, c = 11,586, Ξ² = 109,36Β°, Z = 4).cite-ref-doi10-1515-znb-1995-1013-3-1[3]
Einzelnachweise
cite-note-alfa-11. Datenblatt Cerwolframat bei Alfa Aesar, abgerufen am 16. Juni 2016 (Seite nicht mehr abrufbar).
cite-note-smritimoy-pramanik-22. β Smritimoy Pramanik, Subhash Chandra Bhattacharya: Size tunable synthesis and characterization of cerium tungstate nanoparticles via H2O/AOT/heptane microemulsion. In: Materials Chemistry and Physics. Band 121, Nr. 1β2, 15. Mai 2010, S. 125β130, doi:10.1016/j.matchemphys.2010.01.012.
cite-note-doi10-1515-znb-1995-1013-33. β Thorsten Gressling, Hanskarl MΓΌller-Buschbaum: Zur Kristallstruktur von Ce2(WO4)3 / On the Crystal Structure of Ce2(WO4)3. In: Zeitschrift fΓΌr Naturforschung B. 50, 1995, S. 1513β1516 (PDF, freier Volltext).