Journal of thermal analysis

, Volume 45, Issue 6, pp 1285–1296 | Cite as

Temperature calibration of differential scanning calorimeters

  • D. M. Price
Article

Abstract

A procedure for calibrating the temperature scale of a DSC is described. A different calibration trend was obtained using the transition points of organic compounds compared to that found using the melting points of highly pure metals. The crystal-crystal transitions of three ammonium salts were studied by this method; ammonium dihydrogen phosphate and ammonium sulphate were found to be suitable reference materials in the region −150 to 0°C, but ammonium nitrate was found to be unsuitable due to poorly defined transition points and inconsistent thermal behaviour.

Keywords

ammonium salts crystal-crystal transitions DSC melting transitions reproducible behaviour temperature calibration 

Zusammenfassung

Es wird ein Vorgehen für die Kalibration der Temperaturskale bei DSC beschrieben. Vergleicht man die Verwendung von Umwandlungstemperaturen organischer Verbindungen mit den Schmelztemperaturen von hochreinen Metallen, erhält man unterschiedliche Kalibrationstendenzen. Mittels vorliegender Methode wurde die Kristall-Kristall-Umwandlung dreier Ammoniumsalze untersucht; Ammoniumdihydrogenphosphat und Ammoniumsulfat wurden im Bereich von −150 bis 0°C für geeignete Referenzsubstanzen befunden, Ammoniumnitrat ist hierzu jedoch wegen des nicht genau definierten Umwandlungspunktes und seines inkonsistenten thermischen Verhaltens nicht geeignet.

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Copyright information

© Akadémiai Kiadó 1995

Authors and Affiliations

  • D. M. Price
    • 1
  1. 1.Courtaulds Research & TechnologyCoventryUK

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