The thermochemical behaviour of Te8O10(PO4)4 and its use for phosphide telluride synthesis

Peer Schmidt (1) , Hannelore Dallmann (2) , Gudrun Kadner (2) , Jutta Krug (2) , Frauke Philipp (2) , Klaus Teske (2)

1 Inorganic Chemistry
2 Inorganic Chemistry

The tellurium oxide phosphate Te8O10(PO4)4 has been synthesised by thermal decomposition of Te2O3HPO4 at temperatures above 400 °C. Te8O10(PO4)4 melts at 570 °C and evaporates at 820 °C. The thermodynamic standard data have been determined by solution calorimetry and differential scanning calorimetry and have been optimised by thermodynamic modelling of the binary system TeO2/P2O5:DeltaH(298)(Te8O10(PO4)4) = −5844(2) kJ∙mol−1;S(298)(Te8O10(PO4)4) = 823.3 J∙mol−1∙K−1. The phase relations in quaternary systems M/P/Te/O (M = Ti, Zr, Ce) have been calculated and optimised synthesis parameters for phosphide tellurides have been derived.

Mots clés: Physical Sciences

Peer Schmidt, Hannelore Dallmann, Gudrun Kadner, Jutta Krug, Frauke Philipp, et al.. The thermochemical behaviour of Te8O10(PO4)4 and its use for phosphide telluride synthesis. Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie, 2009, 635 (13-14), pp.2153. ⟨10.1002/zaac.200900350⟩. ⟨hal-00525849⟩