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The Thermochemical Behaviour of Te 8 O 10 (PO 4 ) 4 and its Use for Phosphide Telluride Synthesis
Author(s) -
Schmidt Peer,
Dallmann Hannelore,
Kadner Gudrun,
Krug Jutta,
Philipp Frauke,
Teske Klaus
Publication year - 2009
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200900350
Subject(s) - phosphide , telluride , calorimetry , differential scanning calorimetry , tellurium , standard enthalpy of formation , analytical chemistry (journal) , oxide , chemistry , thermal decomposition , decomposition , materials science , mineralogy , inorganic chemistry , thermodynamics , metallurgy , metal , organic chemistry , physics
The tellurium oxide phosphate Te 8 O 10 (PO 4 ) 4 was synthesised by thermal decomposition of Te 2 O 3 HPO 4 at temperatures above 400 °C. Te 8 O 10 (PO 4 ) 4 melts at 570 °C and evaporates at 820 °C. The thermodynamic standard data were determined by solution calorimetry and differential scanning calorimetry and were optimised by thermodynamic modelling of the binary system TeO 2 /P 2 O 5 : Δ H {}^0_298 [Te 8 O 10 (PO 4 ) 4 ] =–5844(2) kJ · mol –1 ; S {}^0_298 [Te 8 O 10 (PO 4 ) 4 ] = 823.3 J · mol –1 · K –1 . The phase relations in quaternary systems M /P/Te/O ( M = Ti, Zr, Ce) were calculated and optimised synthesis parameters for phosphide tellurides were derived.