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Standard Enthalpy of Formation of Lanthanum Zirconate
Author(s) -
Bolech Mark,
Cordfunke Erik H. E,
Janssen Frans J. J. G.,
Navrotsky Alexandra
Publication year - 1995
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1995.tb08651.x
Subject(s) - standard enthalpy of formation , lanthanum , enthalpy , calorimetry , standard enthalpy change of formation , pyrochlore , standard enthalpy of reaction , chemistry , enthalpy change of solution , zirconate , boron , enthalpy of atomization , thermodynamics , thermochemistry , inorganic chemistry , phase (matter) , organic chemistry , ceramic , physics , titanate
The enthalpy of formation of lanthanum zirconate, La 2 Zr 2 O 7 , which is shown to have a distorted pyrochlore structure, was determined. High‐temperature solution calorimetry in molten lead borate was used to determine the heat of formation from the constituent oxides as −135.8 ± 6.4 kJ/mol at 974 K. Using additional data on the enthalpies of formation of the oxides and heat contents, this value was converted to a standard enthalpy of formation from the elements: Δ f H° 298.15 =−4130.4 ± 6.8 kJ/mol.