Thermochromic behavior (400 < T °C < 1200 °C) of barium carbonate/binary metal oxide mixtures

Emilie Lataste (1) , Alain Demourgues (1) , J. Salmi (2) , C. Naporea (2) , Manuel Gaudon (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Marion Technologies

Irreversible thermochromism over a wide temperature range has been observed from the decomposition of a mixture of a barium carbonate and a metal oxide. The control of the reaction temperature can be predicted from the calculation of the Madelung energy of the barium/transition metal mixed oxide formed consecutively with the decarbonatation. Moreover, the Madelung energy of this formed mixed oxide may be predicted from bond valence considerations. This study offers a simple predictive approach to propose temperature indicators with significant optical contrast and a thermochromic temperature varying between 400 and 1200 °C.

Mots clés: Inorganic pigments; Thermochromism; Metal oxides; Barium carbonates; Colour; Bond Valence

Domaines: Matériaux

Emilie Lataste, Alain Demourgues, J. Salmi, C. Naporea, Manuel Gaudon. Thermochromic behavior (400 < T °C < 1200 °C) of barium carbonate/binary metal oxide mixtures. Dyes and Pigments, 2011, 91 (3), pp.396-403. ⟨10.1016/j.dyepig.2011.05.016⟩. ⟨hal-00606906⟩