Thermochim. Acta(2011), doi:10.1016/j.tca.2012.11.024 ARTICLE IN PRESS GModel TCA-75884; No.of Pages 8, Thermochimica Acta xxx (2011) xxx–xxx Contents lists available at SciVerse ScienceDirect Thermochimica Acta journal homepage:www.elsevier.com/locate/tca