Mössbauer studies of thermal decomposition of metal(III) hexacyanoferrates(II) |
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Authors: | A S Brar H Singh Mrs S Brar B S Randhawa |
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Institution: | (1) Chemistry Department, Guru Nanak Dev University, 143005 Amritsar, India |
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Abstract: | The thermal decomposition of metal(III) hexacyanoferrates(II) (Al, As, Sb, Bi) was studied up to 700° in air by employing Mössbauer, infrared spectroscopy and thermal analysis techniques. With the exception of the bismuth compound, the isomer shift of these hexacyanoferrates(II) increases on dehydration at 200°. Dehydration is complete at 200°, decomposition into the ferrite at 300°, and formation of -Fe2O3 from aluminium and bismuth hexacyanoferrates(II) and Fe3O4 from antimony and arsenic hexacyanoferrates(II) at 700°.
Zusammenfassung Die thermische Zersetzung von Metall(III)ferrocyaniden (Al, As, Sb, Bi) wurde bis zu 700° in Luft unter Anwendung der Mössbauer und Infrarotspektroskopie, sowie thermoanalytischer Techniken untersucht. Die Isomerverschiebung dieser Ferrocyanide nimmt mit der Dehydratisierung bei 200° zu, mit Ausnahme des Wismuts. Die Dehydratisierung ist bei 200° abgeschlossen, die Zersetzung zum Ferrit bei 300° und die Bildung von -Fe2O3 aus Aluminium- und Wismutferrocyanid, von Fe3O4 aus Antimon- und Arsenferrocyanid bei 700°.
Résumé On a étudié dans l'air jusqu'à 700°, la décomposition thermique des ferrocyanures de métaux trivalents (Al, As, Sb, Bi), par spectroscopies Mössbauer et infrarouge, ainsi que par les techniques d'analyse thermique. Le déplacement des isomères de ces ferrocyanures augmente lors de la déshydratation à 200°, à l'exception du bismuth. La déshydratation est complète à 200°, la décomposition en ferrite à 300°, la formation d' -Fe2O3 à partir des ferrocyanures d'aluminium et de bismuth ainsi que du Fe3O4 à partir des ferrocyanures de l'antimoine et de l'arsenic à 700°
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![yucy](/content/m41q78nl11328302/xxlarge1102.gif) ![tcy](/content/m41q78nl11328302/xxlarge1090.gif) ![scy](/content/m41q78nl11328302/xxlarge1089.gif) ![pcy](/content/m41q78nl11328302/xxlarge1087.gif) ![rcy](/content/m41q78nl11328302/xxlarge1088.gif) 700° ![ocy](/content/m41q78nl11328302/xxlarge1086.gif) ![rcy](/content/m41q78nl11328302/xxlarge1088.gif) ![acy](/content/m41q78nl11328302/xxlarge1072.gif) ![zcy](/content/m41q78nl11328302/xxlarge1079.gif) ![ocy](/content/m41q78nl11328302/xxlarge1086.gif) ![vcy](/content/m41q78nl11328302/xxlarge1074.gif) ![acy](/content/m41q78nl11328302/xxlarge1072.gif) ![ncy](/content/m41q78nl11328302/xxlarge1085.gif) ![icy](/content/m41q78nl11328302/xxlarge1080.gif) ![iecy](/content/m41q78nl11328302/xxlarge1077.gif) Fe3O4.
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