화학공학소재연구정보센터
Thermochimica Acta, Vol.445, No.1, 23-26, 2006
Unprecedented formation of metastable monoclinic BaCO3 nanoparticles
Barium carbonate nanoparticles (50-100nm) were prepared by flame spray pyrolysis. The rapid quenching during the preparation process resulted in the unprecedented formation of pure monoclinic BaCO3. The as-prepared materials were characterized by electron microscopy, X-ray diffraction as well as by thermogravimetric and differential scanning calorimetric analyses. At ambient conditions the metastable monoclinic phase transformed easily into the thermodynamically stable orthorhombic BaCO3 (witherite) within a few days. (c) 2006 Elsevier B.V. All rights reserved.