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Thermal decomposition of silver carbonate

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Abstract

Conflicting results have been reported by different workers on the thermal decomposition of silver carbonate, Ag2CO3. In the present study, the decomposition mechanism was elucidated by various analytical methods; gas analysis (differential thermal gas analyses) in helium, carbon dioxide and oxygen flows with and without a P2O5 trap or a KOH trap, DTA-TG in a carbon dioxide flow and high-temperature X-ray diffraction analysis in a carbon dioxide flow.

The gas evolution at ca. 200‡C consisted of carbon dioxide. A simultaneous evolution of carbon dioxide and oxygen occurred at ca. 400‡C. Two endothermic peaks (ca. 189 and 197‡C) without weight change during the heating in a carbon dioxide atmosphere were due to the phase transition of silver carbonate from the normal viaΒ toα phase. The reverse transition occurred during the cooling.

Zusammenfassung

Die von verschiedenen Autoren veröffentlichten Resultate über die thermische Zersetzung von Silbercarbonat, Ag2CO3, sind widersprüchlich. In der vorliegenden Arbeit wurde der Zersetzungsmechanismus mittels unterschiedlicher analytischer Methoden aufgeklÄrt: Differenzthermische Gasanalytik in strömendem Helium, Kohlendioxid sowie Sauerstoff mit und ohne eine P2O5-Falle oder eine KOH-Falle, DTA-TG in strömendem CO2 und Hochtemperatur-Röntgendiffraktion in strömendem CO2.

Die Gasentwicklung bei ca. 200‡C bestand aus CO2. Eine simultane Evolution von CO2 und O2 wurde bei ca. 400‡C beobachtet. Zwei endotherme Maxima (ca. 189 und 197‡C) ohne GewichtsÄnderung beim Aufheizen in CO2 AtmosphÄre wurden auf die Phasenumwandlung des Silbercarbonats von der normalen viaΒ- zurα-Phase zurückgeführt. Der umgekehrte Prozess lief wÄhrend des Kühlvorgangs ab.

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Authors and Affiliations

  1. Department of Industrial Chemistry, Faculty of Engineering, Tokyo

    Y. Sawada & K. Manabe

  2. Institute of Polytechnics, 1583 Atsugi-Shi, 243-02, Kanagawa, Japan

    Y. Sawada & K. Manabe

Authors
  1. Y. Sawada
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  2. K. Manabe
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Additional information

The authors thank Mr. M. Ogawa of our department for the DTA-TG, Mr. M. Amemiya and T. Sakatani of Rigaku Co., Ltd. for the high-temperature X-ray diffraction analysis.

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Sawada, Y., Manabe, K. Thermal decomposition of silver carbonate. Journal of Thermal Analysis 37, 1657–1663 (1991). https://doi.org/10.1007/BF01912194

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